PUSH-OUT TESTS OF SHEAR CONNECTORS FOR NEW FULLY ASSEMBLED STEEL-CONCRETE COMPOSITE BEAMS

This paper proposes a new type of connector in fully assembled steel-concrete composite beams, through which the precast floor slab and steel beam are integrated. The load transfer along the interface of the precast concrete slab and the steel beam is primarily achieved through the friction between the connectors and the channels. To achieve a better understanding of the behavior of the connectors and the channels, push-out tests were conducted on 3 specimens. The effects of different channel types, repeated loading, and number of connectors were investigated. The test results show that all the connectors exhibited satisfactory performance, and the load slip curve can be divided into three segments. When the section height of channel is small, the restraining effect is more remarkable. The shear strength and shear stiffness of the connectors can be improved by reloading. The formulas to calculate the shear strength proposed in this paper agree well with the experimental results.