Push-out tests of straight shear connectors based on steel-concrete adherence

This paper presents the results of an experimental program investigating the behavior of an innovative technology for connections by adherence in composite structures. Connections have a strategic importance for precast concrete and steel-concrete composite structures, since they affect the whole production process, like execution, assemblage and other services on site, besides determining the obtained structural behavior. Currently, however, steel-concrete composite connections are not completely adapted for the use of prefabricated slabs. In this way, the development of new types of connections is clearly necessary, especially to be used in composite bridges, where connections by adherence seem quite promising. To improve the performance of the steel-concrete interface, this research proposes a mechanical treatment of surface associated to the use of a high performance grout. Preliminary push-out tests were performed, and their results are presented and discussed. A satisfactory behavior of the proposed connection was observed, justifying further studies on the subject.