Analytical Model For The Shear Behaviors Of Headed Stud Shear Connectors

Steel-concrete composite structures consist of steel and concrete parts,which are connected by shear connector.The shear behavior of the shear connector will significantly affect the stiffness and the bearing capacity of steel-concrete composite structures.This paper presents a trilinear model of the load-slip curve of shear connectors,in which the shear behavior successively passed three stages.In the first and second stages.A beam on elastic foundation is used to simulate the interaction between the studs and the concrete and the equivalent shear stiffness formula of headed stud shear connector is then derived.According to the deformation and failure modes of the headed stud shear connector at the third stage,the shear stiffness and bearing capacity are obtained.In this model,the equivalent stiffness of the concrete foundation is a key parameter,which given through the finite element simulation of push-out tests.Namely,the influence of the stud diameter,stud height and the elastic modulus of concrete on the equivalent stiffness are numerically investigated to derive the formula of the equivalent stiffness of the surrounding concrete.Finally,by comparing with the experimental and theoretical results in the literature,the accuracy and applicability of the present trilinear model are analyzed in detail.The results show that this model is of high accuracy and wide applicability.This method also directly give the load-slip curve of headed stud shear connector from the material and geometric parameters of headed stud shear connector.