| Based on the investigation of concrete-filled tubular column to steel beam connections in China and abroad,a serial of "concrete-filled square tubular column with internal diaphragms to composite steel-concrete beams with reduced beam Section connections " are designed. These connections are based on the experiment and theoretical results which from our workgroup. With the finite element analyze software ANSYS, the 3D modles according to the connections are founded. The mechnical behavior of connections under the monotonic loading and cyclic loading are analyzed.The Von. Mises failure criterion and multiplier kinematical hardening stress-strain relationships have been used for steel and the William-Warnke failure criterion and elastic-plastic stress-strain relationships used for concrete. Through computation, Load-Displacement curves, stress or strain distribution, distruction situation of the joints are get. The factor of changing axial compression force ratio of the influence of joints capacity behavior is also analyzed. From the results,the joints in the paper display a better ductility and energy dissipation capacity. If the concrete floor is considered,the stiffness and the load capacity of the joints increase properly, and the influence of the stress-strain distribution in the joints are small.The loading capacity and ductility is falling gradually as the axial compression force increasing.Mathmatical modle are derived to simulate the hysteresis behavior of the connections. Simple four or five polygonal line modle are used for substituting the skeleton curve, and simple three polygonal line modle for the hysteresis behavior curve. Simple curve and finite compution curve are compared and better anastomotic.The joints can be used as new form of beam-to-coloumn rigid connections in the nine intensity or III and IV site of eight intensity.At last,the design suggestion of the bending and shearing resistance computation are put forward.
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