| In recent years, frame structures Composed of concrete-filled square steel tubular column and steel beam have been one of the major representations in the development of composite construction. Beam-to-column joint has complex mechanics behaviors and thus is a key problem which engineers concern all the time. This paper summarizes joint types of concrete-filled square steel tubular column with steel beam according to hinged joints, semi-rigid joints and rigid joints, and investigates the research of concrete-filled tubular column to steel beam connections in China and abroad.Based on the achievements in theoretical research, the nonlinear FEM model involving geometric large deformation, contact-friction of high-strength bolts and materials nonlinear is presented. The Von.Mises failure criterion and bilinear kinematical hardening stress-strain relationships have been used for steel and the elastic-plastic stress-strain relationships used for concrete. The concrete cracking and contact- friction of bolts connections are used for the discriminating criteria in terms of ANSYS. The 3D models of beam-to-column connections by 3D solid elements are found. And the capacity behavior of two connections with internal diaphragms under the monotonic loading and cyclic loading are analyzed. The results of nonlinear FEM analyses can show the stresses distribution in the joint better. And then, various factors of the influences of joints capacity behavior can be analyzed such as changing steel and concrete strength etc.According to the results of this paper, this thesis presents the construction details and it can be provide the reference to the engineering design.
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