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  • 1.
    Andrade, Pedro
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Simões, Rui
    University of Coimbra, Department of Civil Engineering, Coimbra.
    Veljkovic, Milan
    Delft University of Technology, Department of Structural Engineering.
    Structural assessment of a column splice with opened slotted holes: Finger Connection2017In: ce/papers, E-ISSN 2509-7075, Vol. 1, no 2-3, p. 514-521Article in journal (Refereed)
    Abstract [en]

    This paper introduces a novel joint based on a friction connection designed for column-splices. The jointwas developed within the scope of modular construction to improve the fast assembly of prefabricatedframes and to accommodate eventual misalignments. Gaps at the connection are considered on the jointhorizontal and vertical axis to accommodate misalignments whether they are rotations and/ordisplacements and so to allow for the easy fit of the columns. The efficiency of the joint resistance basedon different connection gaps subjected to uniform compression is assessed.

  • 2.
    Andrade, Pedro
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Veljkovic, Milan
    Delft University of Technology.
    Simoes, Rui
    University of Coimbra.
    Lundholm, John
    Part Construction AB.
    Innovative system for the construction and management of student resisdences: Frameup system2016In: IABSE CONGRESS, STOCKHOLM, 2016: Challenges in Design and Construction of an Innovativeand Sustainable Built Environment / [ed] Lennart Elfgren, Johan Jonsson, Mats Karlsson, Lahja Rydberg-Forssbeck and Britt Sigfrid, CH - 8093 Zürich, Switzerland: International Association for Bridge and Structural Engineering, 2016, p. 1364-1370Conference paper (Refereed)
    Abstract [en]

    Sweden has a strong demand on the construction of student accommodations and consequently significant efforts have been taken to increase and streamline construction methods. In addition, the fluctuation on the number of students admitted at each year, in each university, lead to periods of house shortage or, in opposition to that, to eventual surplus on the housing market. For these reasons urges finding a fast execution process in construction to fulfil the market needs, together with a housing mechanism of control which balances the students’ needs with the housing availability. In this sense, the Frameup system arises as a solution to solve both problems by combining a modular construction with an innovative execution process.

    The FRAMEUP buildings uses a steel frame in combination with prefabricated 3D modules - fully equipped and suitable for student accommodations – which are assembled by starting from the roof to the 1st floor. The existence of the lifting system permits the erection of the building, promoting each time the building is lifted, a clearance of one-floor-height, at ground level, for the assembly of a new floor. The procedure is repeated several times, according to the number of floors, until the 1st floor of the building, the last floor of the execution sequence, is assembled.

    Alongside with its advantage on the fast execution, the Frameup system allows to efficiently increase or decrease the number of the floors and consequently its exchangeability with other buildings of same nature. Thus, assuming a net of FRAMEUP buildings at each university, its exchangeability system would create the necessary conditions so that the number of floors at each campus would follow the fluctuations of the students’ population among the different universities on different periods of time, so to suppress the needs for housing or to avoid the surplus on construction.

  • 3.
    Bröchner, Jan
    et al.
    Organization of Construction, Department of Technology Management and Economics, Chalmers University of Technology.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    From ideas to construction innovations: Firms and universities collaborating2016In: Construction Economics and Building, ISSN 2204-9029, Vol. 16, no 1, p. 76-89Article in journal (Refereed)
    Abstract [en]

    The purpose here is to study patterns of project collaboration found in one government supported programme for construction innovation. Preferred types of interaction were identified using data from two questionnaire surveys, one with experienced construction sector respondents and one aimed at construction researchers. All sixteen development projects within the Swedish Bygginnovationen programme were investigated, relying on documents and a survey of project managers. Important types of interaction, according to construction respondents, are informal contacts, joint research projects and staff mobility. For university respondents, informal contacts is also seen as the most important type of interaction, followed by MSc thesis work in firms and industrial PhD candidates. Grant applicants from manufacturing depended more on university laboratories and were less sensitive to firm/university distance. Laboratory use was also more frequent for projects relying on the field of materials engineering. In conclusion, there is a consensus about which types of collaboration are valuable. The broadness of participation in the programme, ranging over many industries, both as to origin of ideas and ultimate applications, reaches beyond narrow interpretations of the construction industry. Policy makers should recognize the innovation importance of university laboratory facilities and field testing, rather than seeing researchers as sources of ideas.

  • 4. 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)
  • 5. 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)
  • 6.
    Eriksson, Per-Erik
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Szentes, Henrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Olofsson, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hinder och drivkrafter för industriellt anläggningsbyggande: Underlagsrapport till Produktivitetskommittén, Näringsdepartementet2012Report (Other academic)
  • 7. Gozzi, Jonas
    et al.
    Olsson, A.
    Swedish Institute of Steel Construction.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Experimental investigation of the behavior of extra high strength steel2005In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 45, no 6, p. 533-540Article in journal (Refereed)
    Abstract [en]

    This paper comprises a study concerning the mechanical behavior of extra high strength steel. This is investigated by means of biaxial testing of flat cross-shaped specimens in the full σ1-σ2 plane, a concept developed earlier at Steel Structures, Luleå University of Technology. Furthermore, new specimen designs had to be developed to enable testing of a material with high yield strength and low ultimate over yield strength ratio, such as the extra high strength steel Weldox 1100. The tests are performed in two steps: one initial loading followed by unloading and a subsequent loading in a new direction. The test results, containing data from 15 biaxial tests, are characterized by a slightly anisotropic initial yield criterion where the proof stress in compression is consequently somewhat higher compared to the results in tension. In the subsequent loading the observed phenomena are a Bauschinger effect in the direction opposite the initial loading direction and that the transition from elastic to plastic state in subsequent loadings is gradual and direction-dependent.

  • 8.
    Graciano, Carlos
    et al.
    Universidad Simon Bolivar, Departamento de Mecanica.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Critical buckling of longitudinally stiffened webs subjected to compressive edge loads2003In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 59, no 9, p. 1119-1146Article in journal (Refereed)
    Abstract [en]

    The resistance of steel plate girders subjected to concentrated load can be described using a strength curve, which includes a gradual transition from yielding to buckling depending on the slenderness ratio of the web. The slenderness is a function of the ratio of the yield resistance to the critical buckling load. This paper describes a methodology for the determination of buckling coefficients for longitudinally stiffened plate girders subjected to partial edge loading or concentrated loads. After an extensive parametric analysis, the optimum parameters that govern the change from a global buckling mode to a more local buckling mode were found. As in similar buckling problems, the results show that the location and the relative flexural/torsional rigidity of the stiffener are relevant parameters that govern the final buckling shape. Finally an expression for the buckling coefficient used to determine the critical buckling load for longitudinally stiffened girder webs is presented.

  • 9.
    Granath, Per
    et al.
    Chalmers University of Technology.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Behaviour of girder webs subjected to patch loading1999In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 50, no 1, p. 49-69Article in journal (Refereed)
    Abstract [en]

    This paper concerns the behaviour of bridge girder webs subjected to concentrated forces that are introduced in the web during launching, a load case usually referred to as patch loading. So far, this type of loading has, in engineering practice, been dealt with using formulas originating from investigations concerning the ultimate load carrying capacity. Numerous bridge launchings have, however, led to unwanted damages of the girder web, i.e. plastic deformations of such magnitudes that the webs had to be repaired. To avoid these damages it is necessary to have a design method, for launching situations, which focuses more on avoiding some irreversible behaviour than on the ultimate load carrying capacity. Such a design method has to be based on a deeper understanding of the behaviour of the girder. In Ref. [1] the first author discusses the fact that yielding of the flange occurs only after the web plate has been severely damaged. This paper describes the deformation behaviour of the web plate due to patch loading. For small loads the deformations will be similar to the first linear buckling mode. As the load increases a smaller buckle, in the opposite direction, will start to develop in the web plate close to the load. This behaviour, which may be named post-critical buckling, occurs also for girders of a perfectly elastic material. The investigations are based on laboratory tests and non-linear finite element analyses of three typical girders representing different slenderness categories.

  • 10. Johansson, Bernt
    et al.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Resistance of plate edges to concentrated forces1995In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 32, no 1, p. 69-105Article in journal (Refereed)
    Abstract [en]

    The prediction of the resistance of plate edges to concentrated loads has been dealt with in numerous studies of a more or less empirical nature. The normal approach is to use two criteria for the resistance, one based on yielding and one based on instability. This study aims at a procedure that is harmonized with those normally used for describing other buckling problems. It has been carried out as part of the work with drafting Eurocode 3 Part 2 and the paper is intended as a background document for the suggested design rules.

  • 11.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Anvisningar för svetsförband i ingjutningsgods1989In: Svetsade stålkonstruktioner: Proceedings, Svetskommissionen AG46, 1989, p. Bidrag B3-Conference paper (Other academic)
  • 12.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Byggare utan gränser2005In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 1, p. 68-Article in journal (Other academic)
  • 13.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Bärförmåga vid koncentrerad last på flänsen1993In: Proceedings, Nya Eurpoa-standarder: SBI-LTU Sigtuna, Sweden Feb 2-3 1993, 1993Conference paper (Other academic)
  • 14.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Funktionsentreprenad: en modell för upphandling av husbyggnader1996Report (Other academic)
  • 15.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Funktionsentreprenad för en bättre byggprocess1996In: Byggforskning : Byggforskningsrådets tidning för en bättre byggd miljö, ISSN 1102-3686, no 4Article in journal (Other (popular science, discussion, etc.))
  • 16.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Färre blanketter - bättre forskning2004In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 2Article in journal (Other academic)
  • 17.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hur kommer man fram till ett önskat funktionskrav?2003In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 6, p. 29-31Article in journal (Other academic)
  • 18.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Klimat, religion och livssyn2007In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 2, p. 70-Article in journal (Other academic)
  • 19.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    När ska man börja köpa hus på funktionsentreprenad?1996In: Byggindustrin, ISSN 1104-5981, no 20, p. 32-34Article in journal (Other (popular science, discussion, etc.))
  • 20.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Patch loading on high strength steel girders1995In: Nordic Steel Construction Conference '95: proceedings : [new materials, new codes, new applications] : Malmö, Sweden, June 19-21, 1995, Stockholm: Swedish Institute of Steel Construction , 1995, p. 139-146Conference paper (Other academic)
    Abstract [en]

    This paper focus on three different applications of concentrated forces applied to the flanges of steel girders. Concentrated forces applied at one flange, opposite concentrated forces applied at two flanges and concentrated forces applied at an unstiffened girder end. The first application is recognized as patch loading, the second and third are herein referred to as opposite patch loading and end patch loading, respectively. Results from 43 tests with the high strength steel Weldox 700 are presented, covering all three load applications, with the majority of the tests performed as end patch loading. The tests have been added to test results published elsewhere and used for development of a unified design procedure that is harmonized with those normally used for describing other buckling problems

  • 21.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Patch loading: resistance of steel girders subjected to concentrated forces1995Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Different aspects concerning the resistance of steel girders subjected to concentrated forces have interested a large amount of researchers all over the world. The subject most dealt with among researchers is what is called "patch loading", a concentrated force applied at one flange. Generally, the resistance to concentrated forces is considered as being a problem of very complex nature. Therefore all studies aiming at predicting the ultimate resistance of steel girders to concentrated forces gives more or less empirical solutions. This thesis focus on three different applications of concentrated forces. Concentrated forces applied at one flange, opposite concentrated forces applied at two flanges and concentrated forces applied at an unstiffened girder end. The first application is recognized as patch loading, the second and third are herein defined as opposite patch loading and end patch loading, respectively. The report is divided in two parts, the main text and the appendices. The appendices are used to give results form tests performed herein and to present data for tests taken from the literature, but also to give results from a comparison with a design model suggested herein and the tests. The main text starts with an introduction giving the basis in the subject and a review of earlier work and ends up in a suggestion for a design model for the ultimate resistance for the three different applications of concentrated forces. The design model is developed with the purpose to be consistent for the three load applications, simple enough to be fit for use and also harmonized with those used for other buckling problems. The design model is based on a von Karman approach and includes three parts, an expression for the yield resistance, the elastic buckling load and a resistance function. The expression for the yield resistance is based on observations and conclusions from an experimental investigation, including a total of 48 tests on welded girders made from the high strength, quenched and tempered steel Weldox 700 and 12 tests on rolled beams. All three load applications were tested, with the majority of the tests performed as end patch load test. Approximate solutions for the elastic buckling load for patch loading, opposite patch loading and end patch loading are formulated on the basis of results from FEM. The buckling coefficients includes a contribution from the flange stiffness and the approximate solutions gives a reasonable accuracy compared to the result from FEM. The resistance function is empirically determined from about 250 patch load tests, since this is the only load application for which one can find tests on girders with slender webs in the literature. The resistance function is also proven suitable for opposite patch loading and end patch loading. Compared to results from a total of about 540 tests, the design model suggested herein gives a better accuracy in the prediction of the ultimate resistance for all three load applications than other leading design models from the literature. What can be considered as new and original in this thesis is that it gives a consistent model for prediction of the resistance of steel girders subjected to concentrated forces which is harmonized with the models for other instability problems a design model that extends the applicability to high strength, quenched and tempered steels additional solutions for the critical buckling loads for various boundary conditions

  • 22.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Pressade byggtider: en kartläggning av påverkan på arbetsmiljö och produktionskostnader2004Report (Other academic)
    Abstract [sv]

    Syftet med denna studie har varit att genomföra en kartläggning och analys av relevanta studier och utredningar gjorda efter Korta Byggtider-programmet samt att föreslå åtgärder för att undvika negativa konsekvenser av korta byggtider på kort och lång sikt. Arbetet har utförts utgående från antagandet att pressade byggtider har negativa konsekvenser för arbetsmiljön på byggarbetsplatsen och för produktionskostnaderna. Baserat på de dokument och det material som har ingått i studien kan det dock inte påvisas att det finns grund för detta antagande. Vad som däremot kan konstateras är att ledarskapet och attityderna inom byggbranschen har mycket stor betydelse.

  • 23.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Resistance of bridge girder webs subjected to concentrated forces1998In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 46, no 1-3, p. 62-64Article in journal (Refereed)
    Abstract [en]

    A model for the ultimate resistance of bridge girder webs to concentrated forces that are introduced in the web during launching is presented. The model is formulated on the basis of observations from tests with welded girders made from a high strength, quenched and tempered steel, as well as available 379 test results for different steel grades. The design model is compared with results from finite element calculations on large bridge girder cross sections and a discussion concerning the serviceability limit state. A simplified form of the design procedure is used in Eurocode 3 Part 1.5 and has also been proposed for use in Eurocode 9.

  • 24.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Staten får den byggbransch den förtjänar2003In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 1, p. 54-55Article in journal (Other academic)
  • 25.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Steel girders subjected to concentrated forces1995In: Structural Steel: PSSC '95 - 4th Pacific Structural Steel Conference / [ed] N. E. Shanmugam; Y. S. Choo, Oxford: Elsevier, 1995Conference paper (Refereed)
  • 26.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Svetsförband1993In: Proceedings, Nya Eurpoa-standarder: SBI-LTU Sigtuna, Sweden Feb 2-3 1993, 1993Conference paper (Other academic)
  • 27.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Svetsning i kyla1992In: Utveckling inom området svetsade stålkonstruktioner: Svetskommissionen AG46. Proceedings, 1992Conference paper (Other academic)
  • 28.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Svetsning i kyla: svetsförbands mekaniska egenskaper vid statisk belastning1990Licentiate thesis, monograph (Other academic)
  • 29.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Svetsning utomhus: inverkan av fukt och kyla på svetsens mekaniska egenskaper1989Report (Other academic)
  • 30.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Till Mona2004In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 6, p. 46-Article in journal (Other academic)
  • 31.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Vad händer i verkligheten ?2006In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 3Article in journal (Other academic)
  • 32.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Vem vill att det ska bli billigare att bygga bostäder?2004In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 4, p. 44-45Article in journal (Other academic)
  • 33.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Welding at low temperatures: the mechanical properties for welds in static loading1993In: Proceedings, Nordic Steel Colloquium, ECCS Annual Meeting: Odense, Danish Steel Institute, September 1991, Odense: Danish Steel Institute , 1993Conference paper (Other academic)
  • 34.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Är Darwin ett hinder för samrbete?2003In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 4, p. 60-61Article in journal (Other academic)
  • 35.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Öka attraktionen: något att ta tag i 2008?2008In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 1, p. 73-Article in journal (Other academic)
  • 36.
    Lagerqvist, Ove
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Bostäder och lokaler på funktionsentreprenad: stöd för upphandling2004Report (Other academic)
  • 37.
    Lagerqvist, Ove
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Resistance of I-girders to concentrated loads1996In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 39, no 2, p. 87-119Article in journal (Refereed)
    Abstract [en]

    This paper presents the results from an experimental investigation including tests with welded girders and rolled beams subjected to three different cases of concentrated loads applied to the girder flanges. The welded girders were made from a high strength, quenched and tempered steel, while the rolled beams were of an ordinary steel grade. The results from the experimental investigation presented herein have been added to test results taken from the literature and used for a formulation of a design procedure for the resistance to concentrated loads. The suggested design procedure is unified for the three different load applications and also harmonized with the design procedures normally used for describing buckling problems in the steel codes. The design procedure is a further development of the design procedure for patch loading suggested in B. Johansson & O. Lagerqvist [J. Construct. Steel Res., 32 (1995) 69-105] and has in a simplfied form been suggested for use in Eurocode 3 Part 2 (Bridges), as well as in Eurocode 9.

  • 38.
    Lagerqvist, Ove
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Résistance des âmes de poutres de pont pendant le lancement1996In: Construction Métallique, ISSN 0045-8198, no 2, p. 4-16Article in journal (Refereed)
  • 39.
    Lagerqvist, Ove
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nyby, Mikael
    Tengbert, Thomas
    Welding of quenched and tempered steel at low temperatures1994In: Proceedings / Polartech '94 - International Conference on Development and Commercial Utilization of Technologies in Polar Regions: March 22-25, 1994 Luleå, Sweden, Luleå tekniska universitet, 1994, p. 425-434Conference paper (Refereed)
  • 40.
    Lagerqvist, Ove
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Olsson, Anders
    Egenspänningar i svetsade balkar: en jämförelse mellan rostfritt stål och höghållfast konstruktionsstål1999In: Nordiskt seminarium Utveckling inom området svetsade konstruktioner: Malmö 14-15 september 1999, 1999Conference paper (Other academic)
  • 41.
    Lagerqvist, Ove
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Olsson, Anders
    Luleå tekniska universitet.
    Residual stresses in welded l-girders made of stainless steel and structural steel2001In: NSCC 2001 Proceedings: Helsinki, Finland, 18 - 20 June 2001 / [organized by Helsinki University of Technology ...] / [ed] P. Mäkeläinen; J. Kesti; A. Jutila; O. Kaitila, Helsinki: Helsinki University of Technology , 2001Conference paper (Refereed)
  • 42.
    Lagerqvist, Ove
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Olsson, Anders
    Selén, Emma
    Resistance of stainless steel girders subjected to concentrated forces1998In: Proceedings / Nordic Steel Construction Conference 98: Bergen, Norway, September 14th - 16th, 1998 ; new materials, new codes, new applications, Oslo: Norwegian Steel Association , 1998, p. 775-784Conference paper (Refereed)
    Abstract [en]

    This paper gives the results of an experimental investigation concerning the resistance of welded girders made of austenitic stainless steel subjected to concentrated forces applied at one flange. The results from three tests for each of the two load cases patch loading and end patch loading are presented, together with a comparison of the ultimate resistance from tests and the ultimate resistance according to Eurocode 3 Part 1.1, Ref. 1, and Eurocode 3 Part 1.5, Ref. 2, as well as a comparison of the load-deformation curves obtained in the tests and load-deformation curves obtained in earlier tests performed on girders made of high strength structural steel with identical geometries. It is shown that Eurocode 3 Part 1.5 gives a better prediction of the ultimate resistance than Eurocode 3 Part 1.1 and that the stainless steel girders have a weaker response to the applied load than the girders made of structural steel. Material: 304 steel.

  • 43. Larsson, Tobias
    et al.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Fatigue of riveted metal structures2008In: 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 / [ed] Hyun-Moo Koh; Dan M. Frangopol, Boca Raton, Fla: Taylor and Francis Group , 2008, p. 1254-1261Conference paper (Refereed)
  • 44.
    Ljungquist, Katarina
    et al.
    Luleå tekniska universitet.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    A probabilistic approach for evaluation of radon concentration in the indoor environment2005In: Indoor + Built Environment, ISSN 1420-326X, E-ISSN 1423-0070, Vol. 14, no 1, p. 17-27Article in journal (Refereed)
    Abstract [en]

    An analytical method based on structural reliability has been developed with the objective to ensure a healthy indoor environment for people in residential buildings. The method has been applied to a model of the foundation of a house, which is principally a concrete slab on the ground, when the hazard to the indoor environment is radon. The reasons why radon is found indoors have been identified using fault tree analysis. Random variables in the model are defined such that resistance is the ability of people to withstand the radon concentration indoors without adverse health effects and the load effect is equal to the top event of the fault tree and is a function of the environmental load and the decisions made in the building process. A quantitative evaluation was made using both Monte Carlo simulation and First-order second-moment theory where the load effect is compared with the resistance defined as the threshold value for radon concentration indoors stated in the Swedish Building Regulations. The objective was to calculate the probability for exceeding the threshold value and to estimate analytically the safety index. Other interesting areas of application of the developed model could be for the environmental impact from moisture causing growth of micro-organisms and release of chemical emissions, or from soil contaminates like, for example, petroleum products.

  • 45.
    Ljungquist, Katarina
    et al.
    Luleå tekniska universitet.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Risk analysis procedure to compare undesirable events indoors with consequences to humans2005In: First International Conference on Lifestyle, Health and Technology: June 1-3, 2005 at Luleå University of Technology, Porsön, Luleå, Sweden, Luleå: Luleå tekniska universitet, 2005Conference paper (Refereed)
  • 46.
    Olofsson, Thomas
    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.
    Lagerqvist, Ove
    Industriellt byggande: byggbranschens nya patentlösning2004In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 5, p. 19-20, 22-24Article in journal (Other academic)
  • 47.
    Olsson, Anders
    et al.
    Stålbyggnadsinstitutet.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Stål: kretsloppsmaterial i industriellt byggande2004In: Miljöforskning : Formas tidning : för ett uthålligt samhälle, ISSN 1650-4925, no 1, p. 22-23Article in journal (Other academic)
  • 48.
    Rwamamara, Romuald
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Olofsson, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bo
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Kaminskas, Kazys Algirdas
    Vilnius Gediminas Technical University.
    Evidence-based prevention of work-related musculoskeletal injuries in construction industry2010In: Journal of Civil Engineering and Management, ISSN 1392-3730, E-ISSN 1822-3605, Vol. 16, no 4, p. 499-509Article in journal (Refereed)
    Abstract [en]

    (WMSDs) among construction workers is considerably higher than those in most other occupations. The aim ofthe study presented in this paper was to contribute to understanding a healthy construction site brought about by the bestpractices implemented by large construction sites to prevent WMSDs. A triangulation method made of interviews, site observationsand studies on company's documents was used to identify the best practices in 13 several construction projects.A range of the best practices both in the pre-construction and construction phases of the projects were identified in six differentareas of the balance of the construction workplace system; however, there seems to be a significant need for goodpractices in the management of a systematic work environment. It is now established that Swedish construction industryhas several best practices to protect work-related musculoskeletal health. However, inadequate worker participation andthe neglect of health and safety issues by designers in the planning process as well as the implications of some remunerationmethods on the production schedule were perceived as detrimental to the musculoskeletal health of construction workers.

  • 49. Rwamamara, Romuald
    et al.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Olofsson, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bo
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Kaminskas, Kazys Algirdas
    Vilnius Gediminas Technical University.
    Prevention of work-related musculoskeletal injuries in construction industry2010In: 10th International Conference on Modern Building Materials, Structures and Techniques: Vilnius, Lithuania 19 - 21 May 2010 / [ed] E.K. Zavadskas; P. Vainiunas, Vilnius, 2010, p. 1292-1296Conference paper (Refereed)
    Abstract [en]

    Many construction work tasks are physically very strenuous, and the incidence of work-related musculoskeletal disorders (WMSDs) among construction workers is considerably higher than that in most other occupations. The aim of the research project presented in this paper was to contribute to an understanding of a healthy construction workplace brought about by the best practices implemented by large construction sites. From a preventive perspective, a model for the construction workplace system balance was used to identify the successful strategies. To identify the successful strategies in the Swedish industry to prevent WMSDs, several construction projects were investigated through interviews, site observations and company's documents study. In every construction project, six areas, (i.e., planning, technology used, work organisation, physical work environment, work tasks and the individual worker) of the construction workplace system balance were investigated. Numerous successful strategies both in pre-production and production phases of construction projects were identified in the six different areas of the construction workplace system balance; however there seems to be a significant need for good practices in the systematic work environment management. Further, the implications of some remuneration methods on the production schedule were perceived as detrimental to musculoskeletal health of construction workers.

  • 50.
    Rwamamara, Romuald
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Norberg, Håkan
    Olofsson, Thomas
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Using visualisation technologies for design and planning of a healthy construction workplace2010In: Construction Innovation, ISSN 1471-4175, E-ISSN 1477-0857, Vol. 10, no 3, p. 248-266Article in journal (Refereed)
    Abstract [en]

    Purpose – The purpose of the paper is to investigate how health and safety gains and improvements of the construction workplace can be made through the use of three-dimensional (3D) and four-dimensional (4D) visualization technologies. Design/methodology/approach – The methodology used in the paper was a combination of semi-structured interviews with five construction project planners from three construction projects and observations of a 4D model used in one of the three projects. Findings – The findings of the paper have shown a great potential for 3D and 4D visualization in terms of communicating construction information as well as the health and safety risks in the design process where clash detection, work tasks sequence, workspace congestion can be identified by project stakeholders who are thus able to plan for alternative solutions to reduce or eliminate rework, heavy material handling and repetitive and awkward postures which expose workers to musculoskeletal injury risk. Research limitations/implications – The 3D and 4D models as they are currently used in the design of construction projects, particularly in the three projects investigated in this paper, still lack the worker reference frame and the visual interaction between the worker and the permanent as well as the temporary works. Originality/value – The paper describes the current and emerging trends in the development of 3D, virtual reality and 4D computer-aided design visualization and simulation, which have affected or are likely to have an impact on construction projects planning in the Swedish construction sector.

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