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Title |
Experimental Study on Development of Embedded Demountable Shear Connector for Concrete Girder-Slab Composite Bridges
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Authors |
정대성(Dae-Sung Jung) ; 박세현(Se-Hyun Park) |
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DOI |
https://doi.org/10.4334/JKCI.2022.34.6.609 |
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Keywords |
PSC 거더교; 프리캐스트 콘크리트 바닥판; 분리식 전단연결재; 수평전단실험 PSC bridge; PC slab; shear connector; demountable shear connector; push-off test |
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Abstract |
In concrete composite bridges, stirrup rebars embedded in prestressed concrete girders are used as shear connectors in the precast slab. Since the rebar shear connectors are completely buried in the girder, there are restrictions to replacing aged slabs. Such girders and slabs are removed by cutting but slabs containing shear connectors are crushed. In this process, all of the damaged shear connectors are cut and re-installed using a chemical anchor construction on the concrete girders, to reconstruct new slabs. Additionally, when the concrete slabs are removed, noise and scattered dust are generated by the crushing, which cause environmental problems. To minimize environmental problems during the re-construction of concrete slabs, and economically maintain them with a lower life cycle cost, demountable shear connectors were developed for easy slab replacement. In this work, an embedded demountable shear connector that can be used to easily replace the existing rebar shear connectors in concrete slabs is proposed. Its horizontal shear strength and slip displacement were reviewed through push-off tests. The shear performance of the proposed shear connector was experimentally verified to be excellent compared with that of the conventional rebar shear connector, and the slip displacement satisfied the ductility design code, for sufficient applicability.
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