Experimental and numerical investigations on the behaviour of concrete filled steel tube and channel shear connectors in push-out tests

Abstract

The use of shear connectors in the steel-concrete structural system is widely used to connect the steel and concrete parts of the system. The push-out test is the standard test used to detect the load capacity of different types of shear connectors. In this study, the push –out test was performed on concrete filled steel tube connected using channel shear connectors. The effect of concrete block strength and the exist of concrete core were investigated. Using concrete filled steel tube with increasing the compressive strength of the slab gain higher loading capacity and less slipping than hollow steel tube and low compressive strength of the concrete block. The experimental results were validated using ABAQUS finite element model. A numerical parametric study was carried out to show the effect of the value of concrete block compressive strength, length of the channel connectors, the strength of CFST and the yield stress of these connectors. It turns out that when increases either the length of shear connector or the concrete block strength or the yield stress of shear connector, the ultimate load increases, while the strength of CFST has no effect on ultimate load.