| With the development and advancement of technology, people hope the built environment would be better, and thus put forward higher requirements on the structural design and building materials, such as the large cross, light weight, high strength, durability, corrosion resistance fire, etc. In the civil engineering it is difficult for natural building materials to have a performance in all aspects, and some properties might not be able to meet the requirements for use. For this reason, people could only resort to composite materials or composite structures.Concrete-filled tube structure is the best combinations of concrete and steel from each other. The two materials learn from each other, give full play to the performance of concrete in compression and tensile strength of steel, to optimize the effect. Concrete and steel work together to form the component called concrete-filled tube. Constraint on concrete by steel tube makes concrete in compression by a one-way into a three-compression and not only improves the compressive strength, but also improve the capacity of plastic deformation. Improved concrete plasticity, toughness makes the brittle material into a plastic material, and to avoid and delay the occurrence of local buckling of steel to enhance the reliability and strength of structure, but also save materials and reduce the cost.In this paper, based on the reference to a large number of related documents at home and abroad, it has a research and testing on seismic performance of concrete filled steel tubular beam-column joints and has a comprehensive analysis of mechanic behavior of the semi-rigid node under complex stress state in the earthquake and the deformability, energy dissipation under cyclic loading.
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