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Post-installed shear connectors: Push-out tests of coiled spring pins vs. headed studs
https://orcid.org/0000-0003-1435-0071
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.
Highlights Post-installed shear connectors can be used to strengthen non-composite bridges. Coiled Spring Pins enable an effective post-installation in existing bridges. An alternative type of push-out specimen has been used and evaluated. The failure of a shear connection with coiled spring pins is very ductile and the shear resistance is predictable. A design criterion for the static shear resistance has been developed from push-out test results.
Post-installed shear connectors: Push-out tests of coiled spring pins vs. headed studs
https://orcid.org/0000-0003-1435-0071
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.
Highlights Post-installed shear connectors can be used to strengthen non-composite bridges. Coiled Spring Pins enable an effective post-installation in existing bridges. An alternative type of push-out specimen has been used and evaluated. The failure of a shear connection with coiled spring pins is very ductile and the shear resistance is predictable. A design criterion for the static shear resistance has been developed from push-out test results.
Post-installed shear connectors: Push-out tests of coiled spring pins vs. headed studs
https://orcid.org/0000-0003-1435-0071
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.
Highlights Post-installed shear connectors can be used to strengthen non-composite bridges. Coiled Spring Pins enable an effective post-installation in existing bridges. An alternative type of push-out specimen has been used and evaluated. The failure of a shear connection with coiled spring pins is very ductile and the shear resistance is predictable. A design criterion for the static shear resistance has been developed from push-out test results.
Post-installed shear connectors: Push-out tests of coiled spring pins vs. headed studs
Hällmark, Robert (Autor:in) / Collin, Peter (Autor:in) / Hicks, Stephen J. (Autor:in)
Journal of Constructional Steel Research ; 161 ; 1-16
18.06.2019
16 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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