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  • 101.
    Cheng, Xudong
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Byström, Alexandra
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Wickström, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Veljkovic, Milan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Thermal analysis of a pool fire test in a steel container2012In: Journal of fire sciences, ISSN 0734-9041, E-ISSN 1530-8049, Vol. 30, no 2, p. 170-184Article in journal (Refereed)
    Abstract [en]

    A pool fire test was conducted in an uninsulated steel container under low ambient temperature condition, at −20°C. The heat balance of the enclosure fire was analyzed. The size of the container was 12 m × 2.4 m and 2.4 m high, and it was made of 3-mm-thick steel. During the fire test, the fuel mass loss rate was recorded and the temperatures at different positions were measured with high-temperature thermocouples and plate thermometers. The fire scenario was simulated by using fire dynamics simulator software, and the simulated and measured results were compared. The coarse high-temperature thermocouple responded slower, and therefore, temperature measured by the high-temperature thermocouple was corrected to eliminate the effect of the thermal inertia. Furthermore, a simple two-zone model was proposed for estimating gas temperature in the enclosure of the highly conductive steel walls assuming a constant combustion rate. The convective and radiative heat transfer resistances at the inside and outside surfaces of the enclosure were analyzed.

  • 102.
    Cheng, Xudong
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Veljkovic, Milan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Byström, Alexandra
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Iqbal, Naveed
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sandström, Joakim
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Wickström, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Prediction of temperature variation in an experimental building2011In: Proceedings of International Conference Applications of Structural Fire Engineering: Prague, 29 April 2011, 2011, p. 387-392Conference paper (Refereed)
  • 103. Christian, Cremona
    et al.
    Johansson, Bernt
    Larsson, Tobias
    Patron, Alberto
    S, Hoehler
    B, Eichler
    Improved assessment methods for static and fatigue resistance of old metal railway bridges2008In: Bridge Maintenance, Safety Management, Health Monitoring and Informatics: Proceedings of the Fourth International Conference on Bridge Maintenance, Safety and Management, July 13-17 2008, Seoul, Korea - IABMAS '08, Boca Raton, Fla: Taylor and Francis Group , 2008, p. 3666-3674Conference paper (Refereed)
  • 104.
    Cigen, Sunna
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Materialleverantören i byggprocessen: en studie av kommunikationen mellan träkomponentleverantören och byggprocessens övriga aktörer2003Licentiate thesis, monograph (Other academic)
    Abstract [sv]

    Under de senaste åren har den trämekaniska industrins lönsamhet och möjligheterna att öka förädlingsgraden på träprodukter diskuterats. Utfallet av dessa diskussioner har varit att den trämekaniska industrin tagit initiativ till utveckling och tillverkning av nya byggprodukter av trä. Ett exempel på detta har varit utvecklingen av byggsystem av massivträ. Parallellt med utvecklingen inom den trämekaniska industrin har en diskussion pågått om hur byggbranschen bör utvecklas för att öka effektiviteten i branschen och sänka byggkostnaderna. Bland de åtgärder som föreslås är att öka graden av industrialiserat byggande genom att utnyttja olika typer av färdiga byggsystem. I detta sammanhang är byggsystem av massivträ en intressant produkt. För att en ny produkt ska få fotfäste på marknaden kräv en väl fungerande kommunikation mellan materialleverantör och kund. Licentiatuppsatsens syfte har varit att beskriva och analysera kommunikationsprocessen mellan träkomponentleverantörer och byggföretagets aktörer med utgångspunkt från byggprocessen. Resultatet från analysen har sedan använts för att identifiera de skeden i byggprocessen som har stor inverkan på ett byggprojekts materiallogistik och föreslå hur kommunikationen i dessa skeden bör utformas. Analysen visar att ett stort antal aktörer deltar i kommunikationen och att dessa aktörer har olika informationsbehov och svårigheten för en träkomponentleverantör att möta dessa behov och aktörer. Informationsbehovet varierar även under byggprocessens skeden. De skeden som har identifierats ha stor inverkan på projektets materiallogistik är anbuds- projekterings- och planeringsskedet. Kommunikationen i dessa skeden bör utformas så att informationen skräddarsys efter de kommunicerande aktörernas behov. I varje skede bör kommunikationen utformas så att man i skedets inledningsfas utnyttjar medier som innebär att de kommunicerande aktörerna har möjlighet att skapa direkt kontakt med varandra, och få omedelbar feedback på sina frågor och synpunkter.

  • 105. Cigén, Sunna
    et al.
    Sardén, Ylva
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    The effects of communication on timber suppliers' relations with a construction company2004In: Twentieth annual conference 2004: September 1-3, Heriot Watt University / [ed] Farzad Khosrowshahi, Reading: Association of Researchers in Construction Management , 2004Conference paper (Refereed)
  • 106. Clarin, Mattias
    High strength steel: local buckling and residual stresses2004Licentiate thesis, monograph (Other academic)
    Abstract [en]

    High strength steel provide designers with the possibility of creating more slender and weight efficient structures than would be possible if using steels with lower strength. To be able to do this, a structural designer needs updated and validated codes as aid in their work. This thesis addresses the behaviour of high strength steel with respect to local buckling and residual stresses. The thesis was aiming to determine if there exists any significant differences in the resistance to local plate buckling of high strength steel (fy > 460 MPa) compared to steels with lower strength. Furthermore, longitudinal residual stresses induced by welding were also considered on a basis of material strength. Experimental work considering these two issues was conducted concerning the three steel grades Domex 420, Weldox 700 and Weldox 1100. The investigation concerning the local buckling resistance comprises experiments on 48 welded box section specimens made of the three grades. Nominal plate slenderness values were altered between 0,7 and 1,5. Moreover, the experimental work was founded on plate theory with respect to local buckling and a survey of other conducted comparable experiments. The results from the tests and the literature survey were evaluated with respect to Eurocode 3. The gathered test results from literature and experiments showed that no significant difference between the local buckling resistance of different steel strengths could be concluded if compared to the Winter function. However, the Winter function was concluded to overestimate the resistance for more slender simply supported plates (plate slenderness > 0,9) with residual stresses (in as-welded condition). The residual stress state present in three box sectioned specimens made of the three grades was measured with the blind hole technique. Evaluation of the test results was made with respect to the steel strength and complemented with test results collected from a literature survey. The study showed that the tensile residual stresses induced by welding could not be directly correlated to the material strength. Results from measurements on high strength steel specimens showed that the longitudinal residual stresses was lower if made dimensionless with respect to the strength of the steel.

  • 107. Clarin, Mattias
    Plate buckling resistance: patch loading of longitudinally stiffened webs and local buckling2007Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Incremental launching of steel bridges is a demanding undertaking, on the erection site as well as on the designers desk. Not seldom, the structure itself is during the launching subjected to high concentrated forces on the lower flange when passing over the launching shoe or a intermediate support (e.g. column). These concentrated forces, commonly referred to as patch loads, may be of such magnitude that it governs the thickness of the web in the bridge girder and a small increase in web thickness leads to a substantial gain of steel weight of the bridge. Hence also a higher material cost. One solution to this problem is to reduce the buckling length of the web with the use of a longitudinal stiffener of open (a plate) or closed type (closed profile of e.g. V-shape). The improved patch load resistance is in the Eurocode nowadays determined with the help of the yield resistance for the web and contributing parts of the loaded flange reduced with a factor dependent of the slenderness of the web and the influence of the longitudinal stiffener. Parts in the expressions for the yield resistance and the reduction factor have been somewhat questioned and over the years a substantial amount of tests and FE simulations of longitudinally stiffened webs has been carried out. This research work has produced a large amount of test data which has been used herein to further improve the prediction of the patch load resistance of longitudinally stiffened steel girder webs. Based on the use of the gathered test data from the literature and previously done research, a calibrated patch load resistance function was developed for both open and closed longitudinal stiffeners. Furthermore, a partial safety factor for the proposal was determined according to the guidelines in the Eurocode. In all, the proposal was proven to have an improved level of prediction than other comparable proposals (e.g. Eurocode). Another questioned part in the commonly used design codes is the reduction function concerning local buckling under uniformly in-plane compression. The nowadays used function (the Winter function) has been developed during the 30-ies based on tests on cold formed specimens and has been criticized as being too optimistic regarding plates with large welds. At LTU a series of tests on welded specimens made of high strength steel with large welds was conducted to investigate the aforementioned concerns. Along with test data found in a literature survey, the tests showed that the Winter function was shown to be too optimistic and a new reduction function, based on the test data, was proposed also for this application.

  • 108. Clarin, Mattias
    et al.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Plate buckling of high strength steel: experimental investigation of welded sections under compression2005In: EUROSTEEL 2005: 4th European Conference on Steel and Composite Structures / [ed] B. Hoffmeister; O. Hechler, Aachen: Verlag Mainz , 2005, p. 207-214Conference paper (Refereed)
  • 109. Clarin, Mattias
    et al.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Residual stresses in square hollow sections made of high strength steel2005In: Advances in steel structures: proceedings of the fourth International Conference on Advances in Steel Structures / [ed] Z. Y. Shen, Amsterdam: Elsevier, 2005, p. 1577-1582Conference paper (Refereed)
  • 110.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Vippning av stålbalkar i hallramar1991Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The present thesis, written in Swedish, deals with the problem of lateral-torsional buckling, especially in gable frames. The aim of the work presented is to suggest an improved design method that takes into account the translational and rotational restraint produced by the roof and wall. A particular question is the behaviour of the comer region. More specific, is it a safe assumption to consider the comer as a lateral support. The study includes a review of literature and design methods, analytical solutions of some stability problems, tests on four frames and a FEM simulation. The design methods for lateral buckling usually start from the elastic critical load which defines a relative slenderness of the structure. This slenderness finally gives the predicted capacity. The lateral buckling theory has to take cross-sectional distortion into account because the rotational restraint is often provided concentratedly by purlins or wall rails. This distortion is important also for rolled beams which was not expected. Closed form solutions are presented for the column and references are given to solutions for the roof beam. In order to get some indication of the stability of the comer of a frame, the inner flanges and the stiffener were modelled as a three rod system. The slope of the roof turned out to be of no significance. The results also indicated that the stability of the comer could be questioned when the critical loads of the column and the girder were close to each other. This conclusion was also reached by studies of elasto-plastic frames carried out by Stoverink, at the RWIH, Aachen. Four frames of IPE 180, of which two were haunched, were tested. The two unhaunched frames reached their plastic capacity, and showed a ductile behaviour although their relative slenderness was above the normally accepted limit for full capacity. The two haunched frames, however, buckled before their plastic capacity was reached. This indicates that haunched frames of this type can not be expected to develop their full plastic capacity under conditions similar to those during testing. Finally, the Swedish standards are compared with experimental results, and improvements are suggested. Guidelines are also drawn up for the design of low-rise frames with respect to lateral buckling.

  • 111.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Bridges in high strength steel2006In: Responding to Tomorrow's Challenges in Structural Engineering: IABSE Symposium Budapest 2006 ; report, Zürich: International Association for Bridge and Structural Engineering, 2006, p. 434-435Conference paper (Refereed)
  • 112.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Bättre samverkansbroar på väg2001In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 1, p. 35-40Article in journal (Other academic)
  • 113.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Design of welds in high strength steel2005In: EUROSTEEL 2005: 4th European Conference on Steel and Composite Structures / [ed] B. Hoffmeister; O. Hechler, Aachen: Verlag Mainz , 2005, p. 4.10/89-4.10/99Conference paper (Refereed)
  • 114.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Elementbyggda broar: ett koncept med slagkraft1997In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 3, p. 32-35Article in journal (Other academic)
  • 115.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Eurocode for high strength steel and applications in construction2005In: Super-High Strength Steels: 1st international conference, 2 - 4 November 2005, Rome, Italy, [proceedings], Milano: Associazione Italiana di Metallurgia , 2005Conference paper (Refereed)
  • 116.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Snabba och starka stålbroar1997In: Husbyggaren : bygg, el, VVS, anläggning, ISSN 0018-7968, no 2Article in journal (Other (popular science, discussion, etc.))
  • 117.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Vettbewerbsfähige Brücken in Verbundbauweise1999In: Stahlbau, ISSN 0038-9145, E-ISSN 1437-1049, Vol. 68, no 11, p. 908-918Article in journal (Refereed)
  • 118.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Möller, Mikael
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Shear buckling resistance of non-uniform thickness bridge girder webs2010In: Large Structures and Infrastructures for Environmentally Constrained and Urbanised Areas: IABSE symposium, Venice 2010 ; [34th International Symposium on Bridge and Structural Engineering, Venice, Italy, September 22 - 24, 2010] / [ed] Anton Steffen, Zürich: International Association for Bridge and Structural Engineering, 2010, p. 41-47Conference paper (Refereed)
  • 119.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Möller, Mikael
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Structural applications for high strength steel1998In: Proceedings / Nordic Steel Construction Conference 98: Bergen, Norway, September 14th - 16th, 1998 ; new materials, new codes, new applications, Oslo: Norwegian Steel Association , 1998Conference paper (Refereed)
  • 120.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Möller, Mikael
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Lateral-torsional buckling of continuous bridge girders1998In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 45, no 2, p. 217-235Article in journal (Refereed)
    Abstract [en]

    The resistance of bridge girders with respect to lateral-torsional buckling at support is strongly influenced by the moment gradient. In most design methods this influence is taken into account by the use of a correct critical bending moment in the slenderness parameter λ. This critical moment is influenced by the shape of the moment diagram as well as the distortion of the cross-section and the restraint from the web and stiffeners, if any. In this paper, a method for the calculation of the critical moment is presented. A further effect of the moment gradient is that the stresses due to lateral bending of the flange in connection with lateral-torsional buckling does not coincide with the maximum of stresses caused by bending in the vertical plane. This is taken into account by performing the check for lateral-torsional buckling in a design section at some distance from the support. A design procedure based on this concept has been introduced in Eurocode 3 Part 2: Steel Bridges

  • 121.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Möller, Mikael
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilsson, Mattias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Törnblom, Svante
    Luleå tekniska universitet.
    Undermatching butt welds in high strength steel2009In: Sustainable infrastructure: environment friendly, safe and resource efficient ; proceedings of IABSE symposium, Bangkok, Thailand, Sept. 9 - 11, 2009 / [ed] Mahāvidyālăy Culālaṅkărṇ, Zürich: International Association for Bridge and Structural Engineering, 2009, p. 280-281Conference paper (Refereed)
  • 122.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Pétursson, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Möller, Mikael
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Composite bridges with prefabricated decks1998In: Proceedings / Nordic Steel Construction Conference 98: Bergen, Norway, September 14th - 16th, 1998 ; new materials, new codes, new applications, Oslo: Norwegian Steel Association , 1998Conference paper (Refereed)
  • 123.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Stoltz, Anders
    Luleå tekniska universitet.
    Möller, Mikael
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Innovative prefabricated composite bridges2002In: IABSE symposium Melbourne 2002: towards a better built environment - innovation, sustainability, information technology; Melbourne, Australia 11 - 13 September, 2002, Zürich: International Association for Bridge and Structural Engineering, 2002Conference paper (Refereed)
    Abstract [en]

    The competitiveness of composite bridges depends on several circumstances such as site conditions, local costs of material and staff and the contractor's experience. One major advantage compared to concrete bridges is that the steel girders can carry the weight of the formwork and the wet concrete. Another advantage is the savings in construction time, which saves some money for the contractor but even more so for the road users, a fact that usually is neglected when evaluating alternative bridge designs. A further step to improve the competitiveness of composite bridges is to prefabricate not only the steel girders, but also the concrete deck. In this paper a new concept with dry joints between the elements is described.

  • 124.
    Cremona, Christian
    et al.
    Technical Department for Transport, Roads, Bridges and road Safety Bagneux Cedex.
    Eichler, Bjorn
    Johansson, Bernt
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Larsson, Tobias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Improved assessment methods for static and fatigue resistance of old metallic railway bridges2013In: Journal of Bridge Engineering, ISSN 1084-0702, E-ISSN 1943-5592, Vol. 18, no 11, p. 1164-1173Article in journal (Refereed)
    Abstract [en]

    A large number of the bridges in the European railway networks are metallic bridges. The increasing volume of traffic and axle weight of trains mean that for many structures the loads today are much higher than those envisaged when they were designed. This paper presents a summary of the different recommendations and advices proposed in "Guidelines for Load and Resistance Assessment of Existing European Railway Bridges" of the European Union founded project "Sustainable bridges" for assessing old metal railway bridges. The knowledge of the material properties of existing metal bridges is essential for the resistance assessment and the determination of the remaining lifetime of old metallic bridges. Furthermore, old bridges require more exact and efficient assessment methods that call for a precise description of the material. Among the problems met in metal bridges and material properties estimation, fatigue is the most common cause of failure. To be able to make accurate assessments of existing bridges, it is important to know the behaviour of bridges exposed to fatigue, and how the old materials behave due to cyclic exposure. The main question answered herein is how to make a safe estimation concerning the remaining life in service. The possible traffic load on steel rail bridges is usually limited by the fatigue resistance, but for certain situations the static resistance has also to be checked. Most design rules for steel structures, for instance those in Eurocode 3, are applicable also to riveted structures. However, some information is missing on how to deal with the special case that elements are intermittently connected in contrast welded structures that are connected continuously. As the traditional methods for assessing the resistance of steel bridges are based on elastic analysis, a method for utilizing a limited redistribution of bending moments based on beam theory is proposed.

  • 125. Croon, Ingemar
    et al.
    Apleberger, Lennart
    Stehn, Lars
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Trämekaniska industrin måste lyfta sig i håret2002In: Svensk papperstidning, ISSN 1403-9605, no 12, p. 10-12Article in journal (Other (popular science, discussion, etc.))
  • 126.
    Daerga, Per-Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Girhammar, Ulf Arne
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Källsner, Bo
    Linnéuniversitetet.
    Masonite flexible buildning system for multistorey timber buildnings2012In: World Conference on Timber Engineering, WCTE: final papers / [ed] Pierre Quenneville, New Zealand Timber Design Society , 2012, p. 426-431Conference paper (Refereed)
    Abstract [en]

    The Masonite Flexible Building (MFB) system is a complete timber building system for commercial and residential multi-storey houses. The system is subdivided into two market variants; XL and Light. The XL version is for tall and large buildings with long floor spans while the Light version is adapted for smaller buildings with lower loads. Though differing in technical performance, the functional criteria are the same for both variants. The MFB system uses prefabricated wall, floor and roof elements which are delivered in flat packages and erected on the construction site. The MFB system might be classified as a panel construction, where the load-carrying structure consists of composite light-weight timber I-beams mechanically integrated with a composite laminated wood panel called PlyBoard™. The Ibeams and the panel form a strong and rigid carcass for wall and floor elements, making the system well suited for high rise construction. A key feature of the MFB system is the connection technique which enables swift erection of the system units on site. The plyboard panels are provided with a continuous slot along the periphery. The slot is used as a general connection interface for the joining of the wall elements. The floor elements are suspended and hooked onto the bearing walls using sheet steel hangers, allowing swift assembling of the floor deck and enabling direct vertical wall-towallload transfer parallel to grain. The paper presents the construction principles, system components and units, erection technique and functional and architectural aspects of the Masonite Building System.

  • 127.
    Daerga, Per-Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Girhammar, Ulf Arne
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Källsner, Bo
    Linnéuniversitetet.
    Slotted-in steel-plate connections for panel wall elements: experimental and analytical study2012In: World Conference on Timber Engineering: Final Papers - Architecture and Engineering Case Studies / [ed] Pierre Quenneville, New Zealand Timber Design Society , 2012, p. 451-460Conference paper (Refereed)
    Abstract [en]

    This paper presents an experimental and analytical study of a steel plate connection for joining walls in the Masonite Flexible Building (MFB) system. These connections are used partly for splicing the wall elements and partly for tying down uplifting forces and resisting horizontal shear forces in stabilizing shear walls. The steel plates are inserted in a perimeter slot in the plyboard panel (a composite laminated wood panel) and fixed mechanically with screw fasteners. The load-bearing capacity of the slotted-in steel plate connections are determined experimentally and derived analytically for different failure modes. The test results show ductile post-peak load-slip characteristics, indicating that a plastic design method for shear walls can be applied to calculate the horizontal load-bearing capacity. The slotted-in steel plate connection concept can also be used for joining shear walls to transverse walls for tying down purposes in order to simplify the stabilization system of the building. The use of transverse walls for resisting uplifting forces introduces a three-dimensional behaviour of the wall junction and a more effective load transfer.

  • 128.
    Daerga, Per-Anders
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Girhammar, Ulf Arne
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Källsner, Bo
    Linnéuniversitetet.
    Suspended floor element connections for the masonite flexible building system2012In: World Conference on Timber Engineering: Final Papers - Timber Engineering Challenges and Solutions / [ed] Pierre Quenneville, New Zealand Timber Design Society , 2012, p. 465-472Conference paper (Refereed)
    Abstract [en]

    The authors present an experimental study of a suspended floor element connection (sheet steel hangers) employed in the Masonite Flexible Building (MFB) system. The hangers are mounted with screws and are pre-attached to the floor elements at manufacturing. This arrangement makes the design of the hanger critical with respect to safety and load transfer redundancy, since the screws transfer all the loads, both withdrawal and shear forces can act simultaneously. Tests have been carried out to examine the structural behaviour of the hanger. The two most critical load cases, vertical floor load and horizontal wind suction load, and three different screw joint configurations were investigated. The results indicate that the vertical distance between the screw joint and the upper edge of the rim beam should be increased and that withdrawal forces on the screws should be kept as low as possible. Some suggestions for improving the present design are given and a modified design is proposed to enhance the load-bearing capacity and to improve the overall safety and redundancy

  • 129.
    Dharsana, Victor
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Edberg, Mattias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Bostäder på vatten i nordliga breddgrader: Möjligheten med etablering av vattenytan i form av flytande bostäder i subarktiskt klimat2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Due to the continued advancing of the building industry and the growing number of housing shortages, building on floating components has become an alternative to that on solid land or coastal areas that are geotechnically unsuitable for filling. This can even be done using portable and movable homes. The work is written for Aquashell and the study will describe the possibility of establishing homes on the water surface in Luleå using given floating components. By using suitable building materials and energy supply methods, the building is adapted to Luleå’s sub-arctic climate.

     

    The aim of the work is to design flexible housing which is portable and movable that enables settling on the water surface in colder climates in northern latitudes by the use of suitable materials and building modules.

     

    Firstly, a literature study was conducted on the subject together with studies in the form of interviews and location visits. Then a program was created with requirements for the building.

    After that a design proposal was made containing appropriate material choices which were then chosen to be visualized in Luleå’s Norra Hamn as a possible residential area.

     

    The floating homes are adapted to the climate and designed with respect to the surrounding environment in order to optimally take advantage of the scenic views in the area.

     

    The hope of the work is to demonstrate the possibility for housing on water by use of floating buildings even in sub-arctic climates. The work can also provide a potential solution in response to the ever-increasing shortage of housing.

  • 130.
    Ditrani, Marco
    et al.
    Politecnico di Milano.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Eriksen, Jörgen
    Enochsson, Ola
    Veljkovic, Milan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Andersson, P.
    Vägverket.
    Eriksson, Per
    Vägverket.
    Improving transportation investment decision through life-cycle cost analysis: case study on some bridges in the north of Sweden2009In: Sustainability of Constructions - Integrated Approach to Life-time Structural Engineering: Proceedings of the Workshop Timişoara, 23-24 October 2009. COST Action C25, 2009, p. 266-275Conference paper (Refereed)
    Abstract [en]

    The scope of this project is to perform Life Cycle Cost Analysis (LCCA) on different types of bridges, in order to learn which is most cost-efficient in a particular situation. A second scope is to study the impact of different cost items on the whole Life Cycle Cost. The work is performed to enable optimal strategic decisions regarding future investments.Beam and Slab Bridges, Slab Bridges and Slab Frame Bridges are analyzed. The bridges are located in the north of Sweden, in the regions of Norrbotten and Västerbotten. All bridges have a total length of around 20 m, which is the most common length in Sweden and in Europe. Furthermore, the analysis includes Timber and Soil-Steel bridges in order to understand the prospects for this types of bridges in Sweden. The analysis does not focus on a particular bridge but, based on information from some Swedish producers, it studies different scenarios.The data collection covers initial investments, maintenance, repair and rehabilitation (MR&R) costs, user and demolition costs.

  • 131.
    Edskär, Ida
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Lidelöw, Helena
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Wind-Induced Vibrations in Timber Buildings-Parameter Study of Cross-Laminated Timber Residential Structures2017In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 27, no 2, p. 205-216Article in journal (Refereed)
    Abstract [en]

    A current trend (2016) to construct high-rise timber buildings is seen. In order to understand the limitations posed by the timber material, wind-induced dynamic behaviour causing vibrations in the serviceability limit state has to be studied. The aim of this research is to calculate the natural frequency and acceleration levels of timber buildings having a cross-laminated timber structure to further the understanding of its behaviour and how a change in parameters affects building performance as reflected against comfort criteria. The results were calculated through finite element modelling using commercial software and by performing a modal analysis. The parameters under scrutiny were material stiffness, wall density, damping ratio, building height, and building footprint. The results show that even at moderate building heights (12-14 storeys), the comfort criteria are not fulfilled. Furthermore, the interaction between stiffness and mass for timber buildings needs to be explored further. And since the change of building footprint has a strong influence on the dynamic behaviour, the interplay between architectural and structural design becomes more important. Finally, more data on measurements of damping in timber buildings need to be collected to further validate simulation models.

  • 132. Elfgren, Lennart
    et al.
    Täljsten, Björn
    Carolin, Anders
    Eriksen, Jörgen
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Guidelines for strengthening of railway bridges2009In: Proceedings of Workshop: COST Action C25 : Sustainability of Constructions - Integrated Approach to Life-time Structural Engineering / [ed] Luís Bragança, 2009, p. 141-145Conference paper (Refereed)
    Abstract [en]

    In the international project "Sustainable Bridges", one of the deliverables is a design guide for strengthening of bridges. This paper gives the reader a first look into this guidelinewhich can be found at the projects website: www.sustainablebridges.net

  • 133.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Veljkovic, Milan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Projekt: Centrum för riskanalys och riskhantering, CRR2012Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    En centrumbildning vid LTU i samarbete med näringsliv och samhälle för studier av riskanalys och riskhantering

  • 134.
    Engström, Susanne
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Automation, decentralisering och prestationsutveckling: analys av förändringsmönster vid svenska företag under ett decennium2002Licentiate thesis, monograph (Other academic)
    Abstract [sv]

    Svenska företag har sedan slutet av 1980-talet genomfört förändringar i syfte att förbättra sin prestation inom ett eller flera områden. Långt ifrån alla har dock varit framgångsrika. Förändringsaktiviteterna har tilldragit sig många forskares intresse, och generellt är forskningen inom området överens om att utformningen av företagets organisation har betydelse för utfallet av implementeringen av avancerade teknologiska lösningar. Samma grad av konsensus finns inte vad gäller frågan om utfallet blir bättre om förändringsarbetet huvudsakligen är inriktat på teknologiska förändringar, organisatoriska förändringar eller till kombinationer av dessa. I denna uppsats presenteras fyra studier, tre kvantitativa och en kvalitativ. Syftet med de studier som jag genomför är att kartlägga förändringsmönstret genom att: S1: analysera till vilken grad företag fokuserar sina förändringar tilli. utveckling av tekniska system (T-förändring, förändring med T- fokusii. utveckling av arbetsorganisation (O-förändring, förändring med O- fokus)iii. eller till kombinationer av dessa två utvecklingsalternativ (OT- förändring, förändring med OT-fokus) samt studera förändringsmönstrets prestationspåverkan genom att:S2: analysera vilken betydelse olika förändringfokus enligt i-iii kan ha för utvecklingen av företags prestation. Detta i syfte att undersöka om det går att påvisa att någon fokus enligt i-iii är förenat med större positiv inverkan på prestationsutvecklingen än andra. Resultatet pekar på: (S1) att företag i stor utsträckning förändrar såväl sin teknologi som sin organisation. Ju längre tidsperiod som beaktas desto fler företag genomför förändringar inom båda dessa områden. Bland de studerade företagen inom tillverkande sektor som inte kombinerar de två utvecklingsalternativen dominerar utveckling av arbetsorganisation. Bland handels-/tjänsteföretagen dominerar istället utvecklingen av tekniska system. (S2) att olika förändringsfokus enligt i-iii har olika betydelse för utvecklingen av företags prestation i de olika studierna, men att det sammantagna resultatet talar för en kombinerad utveckling, åtminstone över en längre tidsperiod betraktat och om man bland tillverkande företag fokuserar bearbetningen. Resultaten indikerar några möjliga förklaringar till varför det är så svårt att uppnå konsensus vad gäller (S2). En möjlig orsak till att olika studier uppvisar olika resultat är att prestationseffekterna är tidsfördröjda och att tidsfördröjningen är olika för olika förändringsfokus. En annan möjlig orsak är att den studerade tidsperioden har betydelse för bedömningen av förändringsfokus hos företagen, vilket i sin tur har betydelse för de slutsatser som man kan dra beträffande sambandet mellan förändringsfokus och prestation. För att kunna öka kunskapen inom området krävs bland annat att forskare i framtida studier tar bättre hänsyn till tidsfördröjningen mellan genomförd förändring och prestationsutfall. Mätning av förändringsutfall försvåras även av att företag har en begränsad kunskap om vad de kan uppnå med de organisationer de implementerat eller avser att implementera samt att kunskapen om hur man kan genomföra mätningar av organisationsförändringar förefaller mycket begränsad. Detta skulle kunna vara ett intressant område för fortsatt forskning.

  • 135.
    Engström, Susanne
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Managing information to unblock supplier-led innovation in construction: barriers to client decision-making on industrialized building in Sweden2012Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The overall purpose of this thesis is to further the understanding of the role of the construction client as a decision-maker on supplier-led innovation. The analysis targets the ability of Swedish professional building clients to manage information about innovations extending beyond their current frames of reference. In the thesis it is discussed how this ability can be understood in terms of its potential impacts on clients’ judgments, decision-making and the subsequent implications in terms of blocking/unblocking supplier-led innovations. Innovations addressed in this research are offsprings of contemporary industrialized building, where contractors and material suppliers over many years have developed self-owned methods, organization and technical solutions. Clients, however, do not seem to assist this progress and there are indications that they still experience industrialized building innovations as new and different from what is perceived as “conventional”.The theoretical frame of reference draws from organizational information processing theory and the communication of meaning, integrating descriptive decision theory about human judgment. Recognizing that there is an issue of subjectivity in terms of interpretations, meanings and judgments, a multiple methods approach has been employed for qualitative data collection addressing clients and contractors in and between building projects. From the theoretical and empirical discussions brought together and considered from the perspective of previous research within the field of study, four propositions are elicited. These propositions concern the impact of client uncertainty, interpretation and meaning-making gaps, clients’ approaches to managing such gaps and the project-based setting, on the blocking/unblocking of supplier-led innovations.In their decision-making clients do not only lack data but, even more so, need to deal with the human problem of managing multiple meanings and conflicting interpretations concerning industrialized building. However, clients’ ability to manage information accordingly is found to be low. It is further suggested that if the innovation differs significantly from the conventional (status quo), conflicting meanings must be managed in ways so that they can surface, interact and potentially suggest that different conclusions, at odds with established beliefs, can be drawn by the decision maker. Thus, defining meaning in terms of e.g. stating solutions in tenders, establishing policies and decision criteria can simultaneously support decision-making on conventional alternatives and block innovation. Furthermore, the impact of the predominant project-logic in construction is suggested to restrain and decouple meaning-making and thus be a potential communication barrier between clients and contractors on implementing innovations, in particular such innovations that lead to new building process settings.

  • 136.
    Engström, Susanne
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Overcoming barriers to innovation: demonstrating an argument in favour of communication arenas2014In: Proceedings 30th Annual Association of Researchers in Construction Management Conference, Association of Researchers in Construction Management , 2014, p. 1007-1016Conference paper (Refereed)
    Abstract [en]

    Continuous development efforts including steady-state innovations are necessary for such purposes as of improving short-term performance. However, there is also the need to enable more radical renewal, where development efforts typically stretch beyond the single-project milieu. Supplier-led innovation towards e.g. affordable, sustainable building constitutes such an example. To open up for more radical renewal, one implication of an earlier proposed innovation-barrier/enabler model is the need for sustainable client-contractor arenas for communication, enabling the continuous re-thinking of current experience and understanding by allowing for clients' and contractors' different/conflicting meanings to surface and interact. In Swedish building such arenas seem to be lacking. Underpinning the argumentation is previous research addressing barriers for supplier-led innovation from theoretical perspectives of organizational information-processing and descriptive behavioural decision-making. To better understand the significance of suggested arenas, data were collected in three steps. First, representatives of a building company were interviewed about their personal views regarding barriers/enablers for supplier-led innovation and what primarily determine clients' accept/reject of the builder's standardized system solution. Second, the building-company representatives met with representatives from three client organizations for a round-table discussion concerning barriers to innovation and sector renewal, and means to overcome. Finally, follow-up interviews with building-company representatives sought to capture personal reflections following from foregoing discussion. Collected data were analysed in relation to the previously proposed model, thus simultaneously developing the model and making it more accessible to building practitioners. Cross-analyses of interviews and client-contractor discussion revealed multiple gaps of understanding. Furthermore, to open up for innovation challenging steady-state it is suggested that both client organizations and contractor organizations need to pay close attention to how meanings and understandings are formed and shared within as well as between organizations. A subsequent implication is the need for a more systematically employed communication arena, stretching beyond the short-term project milieu.

  • 137.
    Engström, Susanne
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hedgren, Erika
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sustaining inertia?: Construction clients' decision-making and information-processing approach to industrialized building innovations2012In: Construction Innovation, ISSN 1471-4175, E-ISSN 1477-0857, Vol. 12, no 4, p. 393-413Article in journal (Refereed)
    Abstract [en]

    Purpose – Humans tend to rely on beliefs, assumptions and cognitive rules-of-thumb for making judgments and are biased against taking more uncertain alternatives. Such inertia has implications for client organizations' decision making about innovations, which are inherently more uncertain than conventional alternatives. The purpose of this paper is to contribute to furthering the understanding of barriers to overcoming inertia in client decision making in new-build. Design/methodology/approach – A descriptive behavioural decision-making perspective is combined with an organizational information-processing perspective. To identify and discuss individual and organizational barriers that potentially distort clients' decision making on innovation, the analysis addresses aggregated data from four studies. The analysis focuses on inferences and interpretations made by decision makers in Swedish client organizations, their information-processing practices and the subsequent impacts on perceived meanings and judgments about industrialized multi-storey, timber-framed building innovations, which are perceived by Swedish clients as new and different building alternatives. Findings – Cognitive and organizational barriers maintain status-quo decisions. Clients are inclined to make biased judgments about industrialized-building alternatives because non-applicable cognitive rules-of-thumb, based on their experiences of conventional-building alternatives, are used. Furthermore, client organizations' information-processing practices do not allow different meanings to surface, interact and potentially suggest different conclusions, at odds with established beliefs. Originality/value – The paper's conclusions highlight how inertia is sustained in client decision making in new-build. They illustrate the limitations of a common engineering approach, i.e. supporting decision making about innovations by focusing on providing more information to the decision maker in order to reduce uncertainty, as well as managing multiple meanings by reductionism.

  • 138.
    Engström, Susanne
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Levander, Erika
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Clients as drivers of innovation: lessons from industrialised construction in Sweden2010In: Ph.D. Research Workshop on Technology and Innovation in Construction: Held at Department of Civil, Mining and Environmental Engineering, Luleå University of Technology, Porsön, Luleå, 29 September 2010 / [ed] Paul Chan; Ylva Sardén, 2010, p. 10-20Conference paper (Other academic)
    Abstract [en]

    In the construction sector, the rate of innovations is perceived to be low. Stakeholder pressure has been identified as an important trigger for innovation. But do Swedish construction clients positively respond to, and thus drive, innovation? The purpose of this paper is to increase understanding of the client's role, as a decision maker, for improving the rate of innovation in construction. This by learning from the case of industrialised construction (IC) in Sweden. Swedish construction clients are generally positive to the expected benefits of IC, but are not actively driving the change towards industrialisation. IC challenges common practice as well as stakeholder expectations and schemata on which decisions are made. Case studies addressing Swedish clients' response to IC show that the uncertainties related to potential future regret are prominent issues. Empirical evidence also indicates high levels of equivocality which, according to information processing theory, cannot be reduced by simply increasing the amount of information. To enable client-driven change, improved information processing capability is suggested. Clients that gather and process information on innovation can reduce bias in decision making. Early adopters of innovations such as IC must also manage high levels of equivocality as the amount of information is low and common practice is challenged. A higher involvement of clients in innovation development is advised.

  • 139.
    Engström, Susanne
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Levander, Erika
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Clients as drivers of innovation: lessons from industrialised construction in Sweden2011In: Proceedings of the 6th Nordic Conference on Construction Economics and Organisation: Shaping the Construction/Society Nexus / [ed] Kim Haugbølle ; Stefan Christoffer Gottlieb ; Kalle E. Kähkönen ; Ole Jonny Klakegg; Göran A. Lindahl ; Kristian Widén, Hørsholm: Danish Building Research Institute, Aalborg University , 2011, Vol. 1 ; Clients and Users, p. 13-24Conference paper (Refereed)
  • 140.
    Engström, Susanne
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Lidelöw, Sofia
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    From the Pilot Project to the Mainstream Practice: Learning Explored in Planning and Design of a Low-Energy Quarter2015In: Procedia Economics and Finance, E-ISSN 2212-5671, Vol. 21, p. 288-296Article in journal (Refereed)
    Abstract [en]

    Pilot projects are common platforms for developing/testing construction methods or solutions for e.g. low-energy house-building. Whereas studies report on their technical/engineering outcomes, little is known from a learning perspective. In our study of pilot-project learning, the planning for and assessment of learning from a “low-energy quarter” pilot was explored. In step one, the initiators and the local authority participantswere addressed. The findings of the interviews indicatedthe changed understandings during the pilot of e.g. the planning and design criteria for sustainable building. Although stressed at the pilot outset, it seems that the learning among the stakeholders was not so well documented or systematically evaluated and shared so that the mainstream practice could have been informed or changed

  • 141.
    Engström, Susanne
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sardén, Ylva
    Stehn, Lars
    Towards improving client-contractor communication in industrialised building2009In: Twenty-Fifth Annual Conference, 2009, September 7-9, Albert Hall, Nottingham / [ed] Andrew Dainty, Reading: Association of Researchers in Construction Management , 2009, p. 21-30Conference paper (Refereed)
    Abstract [en]

    Criticism of the building sector in Sweden, concerning for example high cost and poor quality, has lead to a growing interest in industrialised building. However, the effect on the sector and the overall building market is still quite insignificant. One business challenge for industrialised building companies to face in order to become more competitive is to further improve client/market interaction, improve mutual understanding and to reduce uncertainties in client relations. In this ongoing work the communication between industrialised building companies and building clients is examined. The aim is to identify important points of client-contractor communication that affect project outcome and present barriers to effective communication. In addition to a literature review, with the aim to define effective communication , the client-contractor communication in different building projects has been studied. Empirical data was collected through interviews and workshops, observations and project-specific documentation, addressing both clients and contractors. The results indicate that, in order to improve client-contractor communication, it seems important to assess if a barrier to effective communication is client uncertainty, and concerned with lack of information, or if it is client equivocality, which requires richer information rather than more information. The barrier must then be addressed accordingly. In the industrialised building context, client-contractor communication is probably distorted by lack of market/client knowledge concerning the industrialised building process, but also by previous experiences from traditional building.

  • 142.
    Engström, Susanne
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Stehn, Lars
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Barriers to client-contractor communication: Implementing process innovation in a building project in Sweden2016In: International Journal of Project Organisation and Management, ISSN 1740-2891, E-ISSN 1740-2905, Vol. 8, no 2, p. 151-171Article in journal (Refereed)
    Abstract [en]

    Client-contractor communication is vital for achieving project goals but also for adopting innovations. However, this type of communication does not take place across just one interface but across several. In the present study, barriers to client-contractor communication were addressed with the intention of specifically highlighting the potential impact of the project-based setting. A case study of a building project where process innovation was to be implemented provided the data. The analysis focused on meaning-making by different participants during progression of the project until its completion. Although the project was successfully completed, some of the aims of the process innovation were not realised as planned due to emerging meaning-making problems. A main suggestion from the reported findings was that the predominant project logic in construction may be a key barrier to client-contractor communication in implementing innovations presented by actors on the supply-side

  • 143.
    Engström, Susanne
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Stehn, Lars
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sardén, Ylva
    Competitive impact of industrialised building: in search for explanations to the current state2009In: Twenty-Fifth Annual Conference, 2009, September 7-9, Albert Hall, Nottingham / [ed] Andrew Dainty, Reading: Association of Researchers in Construction Management , 2009, p. 413-424Conference paper (Refereed)
    Abstract [en]

    Industrialised building has been proposed as a means of satisfying changes needed in the Swedish building sector. Over the last decade industrialised building has also developed as a niche within this sector. Given its potential, however, some stakeholders think that industrialised building has not yet had the impact they expected, and that the building sector is still in need of change to meet demands for cost reduction, quality improvement and longer managerial time-spans. Consequently, questions arise regarding the competitive position of industrialised building today, and the underlying causes for its present state. This study is based on a literature review, assessing industrialised building over recent decades, and on complementary interviews with researchers and practitioners. The findings are summarised in a conceptual model that outlines the sought effects of industrialised building, as well as the forces that drive and restrain change towards industrialised building. The demands on the building sector are the main drivers of change for the industry. However, the market itself is not actively driving change towards industrialised building, and the information and understanding required to support clients' decision on whether to enforce market power in one or the other direction is not readily available. How building clients value different building possibilities is also unclear. Suggested future challenges are to reduce client uncertainty, to improve client power and to facilitate the comparison of performance between traditional and industrialised building alternatives.

  • 144.
    Eriksen, Jörgen
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Bro utan lager vinnare när miljöanalys görs2009In: Husbyggaren : bygg, el, VVS, anläggning, ISSN 0018-7968, no 2Article in journal (Other (popular science, discussion, etc.))
  • 145. Eriksen, Jörgen
    et al.
    Gervasio, Helena
    University of Coimbra.
    Rebelo, Carlos
    University of Coimbra.
    Silva, Luis Simoes da
    University of Coimbra.
    Veljkovic, Milan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Vesikari, Erkki
    VTT.
    Guidelines to perform life cycle analysis of bridges2008In: Proceedings of Seminar on Sustainability of Constructions - Integrated approach to life-time structural engineering: COST Action C25, Dresden, Germany 6.-7.10.2008, 2008, p. 5.27-5.51Conference paper (Other academic)
  • 146. Eriksen, Jörgen
    et al.
    Veljkovic, Milan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilsson, Martin
    Monitoring of a bridge with integral abutments2009In: Proceedings of Workshop: COST Action C25 : Sustainability of Constructions - Integrated Approach to Life-time Structural Engineering, 2009, p. 176-183Conference paper (Refereed)
    Abstract [en]

    Preliminary results obtained from short term test-loading are used to illustrate possibilities of FEM used to calibrate complex interaction characteristics between a pile and soil in a bridge with integral abutments. The measurements are obtained during the winter season on the bridge over Leduån, in Northern Sweden. The bridge is built in 2006 and used for long term monitoring within the international project INTAB supported by RFCS. The main objective of the on-going research project is to propose recommendations for rational analysis and design of bridges with integral abutments.

  • 147.
    Erikshammar, Jarkko
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Activity: Annual Conference of the International Group for Lean Construction, IGLC 192011Conference paper (Other (popular science, discussion, etc.))
  • 148.
    Erikshammar, Jarkko
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Activity: Annual Conference of the International Group for Lean Construction, IGLC 192011Conference paper (Other (popular science, discussion, etc.))
  • 149.
    Erikshammar, Jarkko
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Activity: ARCOM Doctoral Research Workshop Technology and Innovation in the Construction Industry2010Conference paper (Other (popular science, discussion, etc.))
  • 150.
    Erikshammar, Jarkko
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Activity: Collaborative Product Development: a Purchasing Strategy for Small Industrialized House-building Companies: Licentiatseminarium2011Conference paper (Other (popular science, discussion, etc.))
    Abstract [sv]

    Offentlig redovisning av licantiatuppsats. Lic.examen Jarkko Erikshammar, Träbyggnad, 20 dec kl 14.00 i F1031. Opponent Erik Sandberg LiU, Institutionen för ekonomisk och industriell utveckling, 581 83 Linköping, www.iei.liu.se

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