Analysis of Pull-out of Shear Connectors in Steel-Concrete Composite Structures Considering Discontinuous Deformation

Abstract

Abstract The widely used steel-concrete composite structures can fully utilize the high strength of steel and the relatively high compressive strength of concrete. In the service stage of composite structures, the shear connectors not only subjected to the shear forces, but also pull-out loading. The pull-out process of shear connectors is accompanied by the crack initiation and propagation of concrete. In order to accurately analyze the discontinuous pull-out process and the pull-out capacities of shear connectors, a zero-thickness cohesive zone element based on the enhanced finite element method was used to simulate the concrete crack propagation in the pull-out process of shear connectors. Then, the numerical model of the pull-out of the shear connector was established, and the pull-out process was investigated. The load displacement curve of the pull-out process, the pull-out capacity and the crack patterns were obtained. The discontinuous deformation of the concrete crack initiation and propagation during the pull-out process was successfully simulated