Shear resistance determination of concrete dowel in shallow concrete-steel composite floor-beam based on push-out tests
Unlike conventional composite beam which use headed-shear studs, in shallow concrete-steel composite floor beam system, the web opening of steel beam infilled with in-situ concrete is considered as shear connector. In this paper, empirical formula for the shear resistance determination of trapezoid concrete dowel in shallow concrete-steel composite floor-beam is formed. This established process is based on the failure mechanism and the ultimate loading of push-out tests. The push-out test results were retrieved from our previous experimental investigations which showed that the shear resistance of the shear connector is mainly contributed by con-fined compressive strength and splitting tensile strength of concrete. By performing a combined mechanical-analytical analysis, an empirical formulation originating from the shear transferring mechanism of concrete dowel has been proposed. The formula was then verified against existing data and other equations in the pub-lished literature. The comparison demonstrates that the proposed formulation is the most suitable for the trape-zoid concrete shear connector.
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