New steel-concrete connections by adhesion, interlocking and friction for composite bridges

摘要

A new type of connection resisting by adhesion, interlocking and friction constitutes a structuralrnconcept that aims to create a durable connection between steel girder and prefabricated concreternslab used in composite bridges. The resistance is based on the development of longitudinal shearrnstresses in the interfaces which form the connection. This paper presents experimental andrnanalytical researches that were conducted on this new connection. A large study of its resistance torncyclic loadings was undertaken by mean of tests on interfaces, push-out tests and test on arncomposite beam. The paper presents the analysis of the test results and a design method to predictrnthe fatigue resistance of this connection. It is shown that the damage due to cyclic loading on therninterfaces and on the connection is expressed by the accumulation of a residual slip. Provided thatrnthe shear stresses remain lower than the elastic stress limit and that the accumulated slip does notrnexceed the failure slip for static loading, the fatigue resistance of the new connection is ensured.