AbstractUsing a novel experimental test setup, the behaviour of composite floor slab interfaces having different deck rib orientation and end anchorage detail has been investigated. In the first floor slab configuration, the deck rib orientation was parallel to the supporting beam. For the second and third floor slab configurations, the deck rib orientation was perpendicular to the supporting beam. In the second floor slab, the steel deck did not continue over the top flange in order to give a solid rib of concrete surrounding the shear studs along the secondary beam. The third floor slab used the standard end anchorage detail adopted in Europe, in which the steel deck continued over the top flange and shear studs were welded to the steel beam through the steel deck. Three nominal identical specimens of each detail were constructed and tested. The first specimen of each detail was tested monotonically and the second and third ones tested cyclically.In the elastic range, the results of reversed cyclic loading were found to be similar to those of the monotonic tests, with the backbone curves being very similar. The ultimate in‐plane shear strength of all three was lower than that of the monotonic tests by around 15%. Under cyclic loading, the envelope response of slippage was similar to the monotonic loading response. Slippage of specimens was found to be insignificant in the elastic range even after the yield point, a very small amount of slippage was observed until the specimen reached the ultimate shear strength. Then the slippage increased relatively significantly and the load dropped, with the rate of load decrease being different between configurations.