| 1. |
- Hällmark, Robert, 1981-, et al.
(författare)
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Post-installed Shear Connectors : Push-out Tests of Coiled Spring Pins vs. Headed Studs
- 2019
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Ingår i: Journal of constructional steel research. - : Elsevier. - 0143-974X .- 1873-5983. ; 161, s. 1-16
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Pipinato, Alessio, et al.
(författare)
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Prolonging the Lifetime of Old Steel and Steel–Concrete Bridges : Assessment Procedures and Retrofitting Interventions
- 2019
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Ingår i: Structural Engineering International. - : Taylor & Francis. - 1016-8664 .- 1683-0350. ; 29:4
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Tidskriftsartikel (refereegranskat)abstract
- The structural analysis of existing bridges is not widely covered by the various codes and standards, resulting in the insecure and, in some cases, critical condition of this type of structure. Regarding national regulation, few states include compulsory codes that define the methods and procedures of inspection, assessment, maintenance and retrofitting of bridges. Although an accurate retrofitting procedure can prolong the life of an existing bridge, the more accurate management of national infrastructure assets can result in financial savings in the long term. This article deals with: (a) the assessment step-level procedure, (b) suggestions for bridge load tests and bridge categories, (c) bridge material analysis, (d) structural testing analysis, and (e) the main retrofitting interventions to prolong the life of existing steel and steel composite bridges. Furthermore, a representative case study is analysed and discussed, including examples of the retrofitting solutions implemented to prolong the service life of the bridge.
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| 3. |
- Collin, Peter, et al.
(författare)
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Bridges in high strength steel
- 2006
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Ingår i: Responding to Tomorrow's Challenges in Structural Engineering. - Zürich : International Association for Bridge and Structural Engineering. - 9783857481147 ; , s. 434-435
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Konferensbidrag (refereegranskat)
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| 4. |
- Collin, Peter, et al.
(författare)
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Bättre samverkansbroar på väg
- 2001
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Ingår i: V-byggaren : väg- och vattenbyggaren. - 0283-5363. ; :1, s. 35-40
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Collin, Peter, et al.
(författare)
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Composite bridges with prefabricated decks
- 1998
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Ingår i: Proceedings / Nordic Steel Construction Conference 98. - Oslo : Norwegian Steel Association. - 8291466025
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Konferensbidrag (refereegranskat)
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| 6. |
- Collin, Peter, et al.
(författare)
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Design of welds in high strength steel
- 2005
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Ingår i: EUROSTEEL 2005. - Aachen : Verlag Mainz. - 3861308126 ; , s. 4.10/89-4.10/99
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Konferensbidrag (refereegranskat)
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| 7. |
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| 8. |
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| 9. |
- Collin, Peter, et al.
(författare)
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Innovative prefabricated composite bridges
- 2002
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Ingår i: IABSE symposium Melbourne 2002. - Zürich : International Association for Bridge and Structural Engineering.
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Konferensbidrag (refereegranskat)abstract
- 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.
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| 10. |
- Collin, Peter, et al.
(författare)
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Lateral-torsional buckling of continuous bridge girders
- 1998
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Ingår i: Journal of constructional steel research. - 0143-974X .- 1873-5983. ; 45:2, s. 217-235
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Tidskriftsartikel (refereegranskat)abstract
- 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
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