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  • 1. Ahlenius, Elisabeth
    et al.
    Collin, Peter
    Hedin, Johan
    Att konstruera med höghållfast stål: dimensioneringsmodeller, tillämpningar och exempel1995Report (Other academic)
  • 2. Andersson, Johan
    et al.
    Collin, Peter
    Stålbroar och stålbyggande i Hong Kong och Kina1996Report (Other academic)
  • 3. Blomqvist, Anders
    et al.
    Collin, Peter
    Ranby, Anders
    Dimensionering av svetsförband i seghärdade konstruktionsstål av Weldox 500 och Weldox 7001996Report (Other academic)
  • 4. Collin, Peter
    Dimensionering av hallramar1993Report (Other academic)
  • 5. Collin, Peter
    Potential för det starka stålet1997In: Stålbyggnadsdagen 1996, Universitetsbiblioteket i Tromsø, 1997Conference paper (Other academic)
  • 6. Collin, Peter
    Some trends in Swedish bridge construction1996In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, p. 161-170Article in journal (Refereed)
    Abstract [en]

    This paper, treats some different aspects of steel bridge construction, such as: 1. Composite bridges with prefabricated concrete elements placed on top of welded girders. 2. Hybrid girders made out of S460 web and S690 flanges welded to each other. 3. Welding of High Strength Steel flanges.

  • 7.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Steel Concrete Composite Structures: Part II: Introduction2010In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 20, no 2, p. 126-126Article in journal (Refereed)
  • 8.
    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.

  • 9.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Workshop on eC4-2: Introduction + some Swedish R&D projects2011In: International Workshop on Eurocode 4-2 – Composite Bridges: Stockholm, March 17th 2011 / [ed] Peter Collin; Martin Nilsson; Jens Häggström, Luleå: Luleå tekniska universitet, 2011, p. 1-10Conference paper (Other academic)
  • 10.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Fladvad, Per
    Scandiaconsult Sverige AB.
    Ut med doktorn i produktionen!1999In: Dagens Industri, ISSN 0346-640X, p. 4-Article in journal (Other (popular science, discussion, etc.))
  • 11.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Häggström, Jens
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hällmark, Robert
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    International workshop on strengthening of steel/composite bridges2015Report (Other academic)
    Abstract [en]

    The European infrastructure is rapidly aging, and steel/composite bridges are noexception to the rule. With thousands of older steel/composite bridges, there is ademand of rational methods to strengthen the older bridges to compensate not onlyfor their age, but also for higher loads and new codes, of which perhaps the newfatigue rules for highway bridges in EC3-2 will be the hardest to meet.Within the frames of the European R&D project Prolife (RFCS-CT-2015-00025) aworkshop was arranged in Stockholm September 28th 2015. Bridge owners,designers and researchers from 12 countries participated, and the similaritiesbetween the countries as well as the variety of technical solutions were highlighted.The contributions are presented in this report and the organizers want to thank allparticipants for making this seminar successful.

  • 12.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Höglund, Torsten
    Pétursson, Hans
    Samverkansbroar med elementbyggda farbanor1998Report (Other academic)
    Abstract [sv]

    Publikationen beskriver olika effektiva sätt att bygga samverkansbroar med stålbalkar och prefabricerade farbaneelement av betong. Konceptet är konkurrenskraftigt i jämförelse med konventionella lösningar, särskilt då hänsyn tas till trafikantnytta. Exempel på utförda projekt i Sverige och övriga världen redovisas, samt fullskaleprovningar av farbaneelementen.

  • 13.
    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)
  • 14.
    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)
  • 15.
    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)
  • 16.
    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)
  • 17.
    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)
  • 18.
    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.))
  • 19.
    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)
  • 20.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Örjan
    Banverket.
    Lundmark, Tore
    SCC Sverige AB.
    Ny teknik förlänger livet för Forsmobron2003In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 1, p. 44-47Article in journal (Other academic)
  • 21.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Lundmark, Tore
    Scandiakonsult.
    Competitive Swedish 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]

    During the 1990's, composite steel and concrete bridges took over an increasing portion of the market. The purpose of this article is to highlight current developments in the field of girder bridges, which account for the majority of the composite bridges.

  • 22.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Möller, M.
    Luleå tekniska universitet.
    Stoltz, Anders
    Luleå tekniska universitet.
    Ponts mixtes à dalles préfabriquées2001In: Construction Métallique, ISSN 0045-8198, no 3Article in journal (Refereed)
  • 23.
    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)
  • 24.
    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)
  • 25.
    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

  • 26.
    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)
  • 27.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nakamura, Shunichi
    SEI Editorial Board.
    Steel Concrete Composite Structures: Introduction. Part I2009In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 19, no 4, p. 395-Article in journal (Other academic)
  • 28.
    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)
  • 29. Collin, Peter
    et al.
    Pétursson, Hans
    Ramböll Sverige AB, Luleå.
    Stenmark, Jan
    USA 1993: en resa i brobyggandets tecken1993Book (Other (popular science, discussion, etc.))
  • 30.
    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.
    Tornberg, Håkan
    Broar med integrerade landfästen2005In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 3, p. 45-49Article in journal (Other academic)
  • 31.
    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.

  • 32.
    Feldmann, M.
    et al.
    Rheinisch-Westfälische Technische Hochschule Aachen (RWTH).
    Naumes, J.
    Rheinisch-Westfälische Technische Hochschule Aachen (RWTH).
    Pak, D.
    Rheinisch-Westfälische Technische Hochschule Aachen (RWTH).
    Veljkovic, Milan
    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.
    Eriksen, J.
    Luleå tekniska universitet.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Kerokoski, O.
    Ramböll Sverige AB (Ramböll).
    Pétursson, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Verstraete, M.
    Université de Liège.
    Vroomen, C.
    Université de Liège.
    Haller, M.
    ArcelorMittal Belval & Differdange (AM R & D).
    Hechler, O.
    ArcelorMittal Belval & Differdange (AM R & D).
    Popa, N.
    ArcelorMittal Belval & Differdange (AM R & D).
    Economic and durable design of composite bridges with integral abutments2010Report (Refereed)
    Abstract [en]

    In the design and construction of bridges, questions of sustainability, maintenance and durability are becoming more and more important for European road administrations, in addition to safety and serviceability issues. Therefore integral abutment bridges are becoming highly attractive to designers, constructors and road administrations, as they tend to be less expensive to build, easier to maintain and more economical to own over their life time. Bearings and joints are main sources of maintenance costs during a lifetime. These costs vanish because the bridges are joint- and bearing-free. However, this very advantage complicates the design compared to conventional bridges in some crucial respects. Combined with the fact that most European countries have only limited experience with integral bridges to date, this leads to a reluctance of road administrations to use this bridge type. Thus the main objective of the project is to experimentally and theoretically investigate the behaviour of critical points of integral abutment bridges. Regarding the soil-structure interaction, recommendations are elaborated based on monitoring results as well as previous research and monitoring campaigns. Conventional HP piles and sheet piles are investigated as a foundation. Furthermore a hinged HP connection is developed to decrease the stresses in the pile system. An investigation of the design and construction of the slab to pavement approach is also carried out to avoid major damages to the structure. Finally the most important information is condensed into the essential features in form of a 'Design guide for composite bridges with integral abutments'

  • 33.
    Frangi, Andrea
    et al.
    SEI Editorial Board.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Geier, Roman
    IABSE WC2.
    Bridges with Integral Abutments: introduction2011In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 21, no 2Article in journal (Other academic)
  • 34.
    Hechler, O.
    et al.
    ArcelorMittal.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    On the use of duplex stainless steels in bridge construction2008In: 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 G Frangopol, Boca Raton, Fla: Taylor and Francis Group , 2008Conference paper (Refereed)
    Abstract [en]

    Maintenance and the related costs in the life time of existing structures are an ever growing problem and bridges are no exception to this rule. Much of the maintenance costs are related to corrosion of steel members. Especially when steel and composite bridges are built in aggressive environments (e.g. close to seawater or in industrial atmospheres) these costs become of major importance. However also concrete bridges are concerned as the re-bars in concrete decks may be subjected to corrosion caused by chloride ingress from de-icing salt or seawater. Consequently the use of a material providing high mechanical properties with a sufficient corrosion resistance for the application in these aggressive environments would lead to economic and durable construction. Further the maintenance costs become predictable, which would increase the quality of the bridge management. Duplex stainless steel is this material with sufficient yield strength, stiffness and toughness as well as an excellent durability in aggressive environments. With a targeted material choice, innovative construction solution may be achieved. However, high material costs, gaps in common knowledge, e.g. on fatigue, as well as fabrication aspects are preventing a wider application of these steels in bridge construction.

  • 35.
    Häggström, Jens
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilsson, Martin (Editor)
    International Workshop on Eurocode 4-2, Composite Bridges2011Report (Other academic)
    Abstract [sv]

    Under de senaste åren har ingenjörer och designers i Europa börjat att använda Eurokod 4-2 – Samverkansbroar. Tillämpningen är nästan densamma i de olika länderna, fast med vissa skillnader, som det kan vara i början. Man har funnit en del svårigheter, problem och fördelar. Den 17 mars 2001 hölls en workshop om Eurokod 4-2 – Samverkansbroar på Ramböll i Stockholm och som lockade omkring 55 personer från tio olika länder. Workshopen fokuserade på bakgrunden till reglerna, på erfarenheter från Frankrike, Storbritannien, Sverige och Italien och avrundades med lite innovativa utveckling av samverkansbroar och en diskussion om möjlig forskning och utveckling för vidare utveckling av Eurokod 4-2.

  • 36.
    Häggström, Jens
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Fatigue assessment of stringer beams using structural healthmonitoring2016In: 19th IABSE Congress Strockholm 21-23 September 2016: Challenges in Design and Construction of an Innovative ans Sustainable Built Environment / [ed] ennart Elfgren, Johan Jonsson, Mats Karlsson, Lahja Rydberg-Forssbeck and Britt Sigfrid, CH - 8093 Zürich, Switzerland, 2016, p. 1455-1462Conference paper (Refereed)
    Abstract [en]

    Fatigue assessment of existing bridges is often carried out through simple calculations where the nominalstress range is compared with the fatigue strength based on a number of detail categories specified incodes. Presented in this paper, is the stepwise fatigue assessment through measurements of the 60 yearold bridge over Rautasjokk located in northern Sweden. According to the code‐based assessment of thestringers, it has already exceeded its lifetime about four times; however no cracks have been identified. Bymeasuring strains the real state of stress was identified, where both nominal stresses and local approacheshave been evaluated and compared. Even though the local approach should provide a better accuracy incomparison with the nominal stresses, this approach was only favorable for one out of the three studiedlocations.

  • 37.
    Häggström, Jens
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Tu, Yongming
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Southeast University, School of Civil Engineering, Nanjing.
    Full-scale testing to failure of a steel truss railway bridge2017In: Proceedings of the Institution of Civil Engineers: Engineering Sustainability, ISSN 1478-4637, E-ISSN 1751-7664, Vol. 170, no 2, p. 93-101Article in journal (Refereed)
    Abstract [en]

    Significant resources have been invested in maintaining existing infrastructure. Many structures are becoming old, do not meet current requirements, or are reaching the end of their life cycle. It is not feasible or sustainable to replace all of those that may be deemed obsolete; however, often their specified capacities are very conservative. So there is an urgent need to obtain more robust knowledge of their true status. This paper describes a unique project, in which a 33 m long steel truss railway bridge (over the Åby River) was tested to failure. The findings can be used to identify optimal solutions for other bridges of the same design that are still in use, notably the bridge over Rautasjokk (a river in Sweden). These two bridges were tested in three stages. This paper focuses on the second stage, wherein Åby Bridge was subjected to static full-scale testing to failure, by pulling it downwards. The global failure mode consisted of buckling of the top chord with yielding of the steel starting at a total load of 8 MN and the peak load being reached at around 11 MN, corresponding to a load approximately four to five times higher than the characteristic design load.

  • 38.
    Häggström, Jens
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering. Skanska Teknik, Göteborg.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering. Ramböll Sverige AB, Luleå.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Assessment and full scale failure test of a steel truss bridge2015In: IABSE symposium Madrid 2014: Engineering for progress, nature and people, Zürich: International Association for Bridge and Structural Engineering, 2015, p. 2757-2764Conference paper (Refereed)
    Abstract [en]

    Large amount of resources has been invested in maintaining existing infrastructure. Several of these structures are now becoming old and do not meet the requirements of today or are reaching the end of their lifecycle. It is not possible to replace all of these structures that are deemed or are about to be deemed obsolete, due to high cost and environmental impacts.One way to keep these structures in use for a longer time is innovative and intelligent assessment of the actual state of stress and behaviour. In such cases, using structural health monitoring to assess the structure might be an efficient way to extend the life of the structure.This paper will describe a unique monitoring program over two similar 33 m long steel truss bridges situated in Sweden. One of these bridges, Aby River, has a regulated axle load of 25 tons and is deemed to have reached is end of life due to fatigue. The other bridge, Rautasjokk, has a regulated axle load of 30 tons but will be in use for the coming years.The monitoring program has the following outline; monitoring of the bridge over Aby river when it is in service, after replacement this bridge will be moved and tested under static loads to assess boundary conditions and state of stress, then parts of this bridge will be disassembled and these parts will be tested in laboratory environment for fatigue life assessment, all of these results will then be controlled by monitoring of the bridge over Rautasjokk in service limit state.The outline of this project will give input for the fatigue life models that are used today and probably upgrade the fatigue life of the bridge over Rautasjokk.

  • 39.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Swedish Transport Administration, Luleå, Sweden.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Ramböll, Luleå, Sweden.
    Post-Installed Shear Connectors: Monitoring a Bridge Strengthened with Coiled Spring Pins2019In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 29, no 2, p. 225-233Article in journal (Refereed)
    Abstract [en]

    Traffic density and vehicle weight have been increasing over time, which implies that many existing road bridges were not designed for the high service loads and increased number of load cycles that they are subjected to today. One way to increase the traffic load capacity of non-composite steel–concrete bridges is to post-install shear connectors. This paper presents a study of a steel–concrete bridge that has been strengthened with post-installed coiled spring pins, a type of connector which can be installed from below while the bridge is still in service. The strengthening method and design procedure are presented, along with the results from field monitoring performed to evaluate the behaviour of the strengthened structure. The results from the strengthened and non-strengthened sections show that the coiled spring pins counteract the slip and increases the degree of composite action. Finite-element models of the field tests were created in order to compare the results using different design assumptions and establish a suitable level of detail for modelling the shear connectors.

  • 40.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Swedish Transport Administration, Luleå, Sweden.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Ramboll, Luleå, Sweden.
    Hicks, Stephen J.
    Heavy Engineering Research Association, Auckland, New Zealand.
    Post-installed shear connectors: Fatigue push-out tests of coiled spring pins2019In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 153, p. 298-309Article in journal (Refereed)
    Abstract [en]

    The number of heavy vehicles and their weight have been increasing over time, implying that many bridges are experiencing traffic loads with higher magnitude and frequency than they were originally designed for. In some cases, it will be necessary to either replace or strengthen the structures to keep the bridges in service. For existing non-composite steel girder bridges, post-installation of shear connectors can often be used to increase the traffic load capacity significantly. One type of shear connector that is suitable for post-installation, even though not commonly used, is the Coiled Spring Pin. These interference fit connectors can be installed from below the bridge deck during traffic, in order to minimize the impact on road users. This paper describes an experimental study on the fatigue strength of Coiled Spring Pins and a compilation of previously performed fatigue tests on this type of connector. The new test series, with nine specimens, are evaluated statistically and a fatigue strength design equation is proposed. The results show that there are large variations between different test series, while tests within the same series show good agreement. The reasons for this are discussed in the paper along with recommendations for future testing.

  • 41.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Swedish Transport Administration, Luleå, Sweden.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Ramboll, Luleå, Sweden.
    Hicks, Stephen J.
    Heavy Engineering Research Association, Auckland, New Zealand.
    Post-installed Shear Connectors: Push-out Tests of Coiled Spring Pins vs. Headed Studs2019In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 161, p. 1-16Article in journal (Refereed)
    Abstract [en]

    Steadily increasing traffic volumes and traffic loads lead to a continuously growing demand for bridge rehabilitation, strengthening and replacement projects. For existing steel girder bridges with non-composite concrete decks, the traffic load capacity can often be increased significantly if composite action can be created afterwards. Different kinds of shear connectors are more or less suitable for post-installation. Coiled spring pins are one type of interference fit connector that can be installed from below the bridge deck during traffic, in order to minimize the impact on road users. This paper describes an experimental study on the static capacity and stiffness of coiled spring pins used as shear connectors at steel-concrete interfaces. Six push-out test series are presented, with a total of 28 tests, together with an alternative type of test set-up. The results show that the failure of the coiled spring pins is very ductile and that the load capacity is predictable and sufficient for a cost-effective application. The tests also indicate a significantly lower stiffness of the connectors in comparison to welded headed studs of similar dimensions, which might be of great importance if an existing shear connection is strengthened.

  • 42.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Trafikverket, Luleå.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Ramböll, Luleå.
    Möller, Mikael
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. SSESAB, Luleå/Helsingborg.
    Testing of coiled spring pins as shear connectors2017In: IABSE Symposium, Vancouver, 2017: Engineering the Future, Zürich, Switzerland: IABSE - International Association for Bridges and Structural Engineering , 2017, p. 1209-1216Conference paper (Refereed)
    Abstract [en]

    A few decades ago, steel-concrete composite bridges were quite rare structures, whereas steel girder bridges with non-composite concrete decks were rather common. For the latter type of structure, composite action can be obtained long after the bridges were constructed by post installation of shear connectors. Most installation procedures involve reconstruction of pavement and concrete deck, which will result in traffic disturbance. There are however some types of shear connectors that can be installed from underneath, connecting the top flanges to the concrete deck, without affecting the upper surface. This means that the bridge can be strengthened during traffic. One type of such a shear connector is the coiled spring pin, which is an interference fit connector. This paper presents the results from push-out tests conducted in order to find the static capacity and the load-slip behaviour of coiled spring pins used as shear connectors.

  • 43.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Collin, Peter
    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.
    The behaviour of a prefabricated composite bridge with dry deck joints2013In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 23, no 1, p. 47-54Article in journal (Refereed)
    Abstract [en]

    This paper describes the monitoring of a one-span composite bridge in northern Sweden. The bridge was built in 2000, with prefabricated deck elements connected to steel girders, and the back walls as well as the piers were also prefabricated. The monitoring was required to clarify the doubts regarding whether a bridge with dry deck joints can be expected to perform as a conventional composite bridge, with in situ cast deck and sections with sagging moments. To get a better understanding of the long-term structural behaviour, the bridge was monitored both during 2001 and 2011, instrumented with equipment measuring the deflections and strains in the steel cross section. The bridge was loaded with a truck in midspan having a total weight of 25 t. When the truck was centred between the girders, the results showed a symmetric behaviour, with respect to deflections and stresses. For the case with the truck stationed right above one of the steel girders, anti-symmetric behaviour was observed and studied by means of finite element calculations, taking into account the stiffness of the composite section as well as the end screens and the earth pressure below them.

  • 44.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilsson, Martin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    A study of concrete shear keys in prefabricated bridges with dry deck joints2011In: Nordic Concrete Research: Proceedings of the XXI Nordic Concrete Symposium, Hämeenlinna, Finland 2011, Oslo: The Nordic Concrete Federation , 2011, p. 495-499Conference paper (Refereed)
  • 45.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilsson, Martin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Concrete shear keys in prefabricated bridges with dry deck joints2011In: Nordic Concrete Research, ISSN 0800-6377, Vol. 2011, no 44Article in journal (Refereed)
    Abstract [en]

    A prefabricated concrete deck with dry joints between deck elements has been developed to make prefabricated bridges even more competitive. This type of bridge deck has been used on single span bridges in Sweden, and is now under development for multi span bridges. This paper describes how the deck system works. Results from laboratory tests of shear keys between deck elements are also presented together with an analysis comparing the predicted capacity with the measured failure load.

  • 46.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilsson, Martin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Large-scale tests on a composite bridge with prefabricated concrete deck and dry deck joints2013In: Stahlbau, ISSN 0038-9145, E-ISSN 1437-1049, Vol. 82, no 2, p. 122-133Article in journal (Refereed)
    Abstract [en]

    This paper describes the large-scale tests on a composite bridge with prefabricated deck elements and dry joints between the elements. The work is part of the European R&D project ELEM (RFCS-CT-2008-00039). This type of bridge has been used for three single-span bridges in Sweden and has contributed to minimizing construction time as well as disturbance to traffi c. The behaviour at midspan and the behaviour over an internal support of a continuous bridge were studied in the tests, and the results analysed by FEM and discussed. Conclusions regarding the design of this type of bridge are drawn, with respect to the global analysis as well as cross-section capacity.

  • 47.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilsson, Martin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Prefabricated composite bridges2009In: 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. 282-283Conference paper (Refereed)
  • 48.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Trafikverket, Luleå.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Ramböll, Luleå.
    Petersson, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Andersson, Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Monitoring of a bridge strengthened with post-installed coiled spring pins2017In: IABSE Symposium, Vancouver, 2017: Engineering the Future, Zürich, Switzerland: IABSE - International Association for Bridges and Structural Engineering , 2017, p. 1201-1208Conference paper (Refereed)
    Abstract [en]

    Many existing bridges were not originally designed for the traffic loads and the number of load cycles which they now experience. In order to increase the load capacity of non-composite steel-concrete bridges, post installed shear connectors can be used. This paper describes a field monitoring of a steel-concrete bridge which have been strengthened with post-installed coiled spring pins as shear connectors. During the monitoring, the bridge was loaded with a 31 tonnes truck placed in specific positions while strains were measured in the steel main girders, together with the horizontal slip at the steel-concrete interface. The results indicate that the coiled spring pins prevent the slip and that they can be used for strengthening purpose. It is also observed that the friction in the steel-concrete interface can contribute quite a lot to the composite action, even though that effect cannot be accounted for in the design.

  • 49.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Petursson, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Bernt
    Simulation of low-cycle fatigue in integral abutment piles2007In: Improving Infrastructure Worldwide: IABSE symposium, Weimar 2007, [September 19 - 21, 2007] ; report / [ed] Ulrike Kuhlmann, Zürich: International Association for Bridge and Structural Engineering, 2007Conference paper (Refereed)
    Abstract [en]

    Integral abutment bridges are bridges without any expansion joints, and their largest benefits are the lower construction- and maintenance costs. In order to build longer integral bridges it might be necessary to allow plastic hinges to be developed in the piles. Lateral thermal movements are the major reason to plastic deformations, and since temperature variations are cyclic it has to be proved that low-cycle fatigue will not occur. A simulation of the pile strain spectra should be able to take into account the strains caused by temperature variations and traffic loads. Such a model has been created from real temperature data and traffic loads measured by Bridge-Weigh-In-Motion technology. Monte Carlo simulations have been performed in order to simulate daily and annual temperature changes as well as the varying traffic loads. Piles strains have been calculated, and their fatigue effect has been evaluated.

  • 50. Hällmark, Robert
    et al.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Stoltz, A.
    Innovative prefabricated composite bridges2009In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 19, no 1, p. 69-79Article in journal (Refereed)
    Abstract [en]

    The competitiveness of composite bridges depends on different circumstances such as site conditions, local costs of material and staff, and the experience of the contractor. Two major advantages of composite bridges compared to concrete bridges are the ability of the steel girders to carry the weight of the formwork and the fresh concrete, and the shorter construction time which not only saves money for the contractor but even more for the road users. A further step is to prefabricate not only the steel girders, but also the concrete deck. In this paper, a new concept for composite bridges is described, with dry joints between the prefabricated concrete elements. The principal of the technique is presented, as well as some laboratory test simulating the load situation at an internal support in a multi-span bridge. Also, some experiences from an already built single span composite bridge with dry joints are presented.

12 1 - 50 of 75
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