Study Of The Seismic Performance Of Concrete Filled Steel Tubes

In recent years, concrete filled steel tubular columns have been widely applied in high-rise structure due to their many advantages, thus it is very meaningful to do further research on this structure. In this paper, the experimental study of the concrete filled steel tubular column single beam joint was carried out, which is based on the model of New China building in Guangzhou. The static behavior and dynamic behavior under low-cyclic reversed load of the joint were analysed to examine the rationality and reliability of the joint design. Furthermore, the finite element analyse of joint with Ansys was put forward to find out the internal mechanical behaviour of the joints. According to the analyses, the steel tube stress in the joints is still in an elastic state when the reinforced bar and steel bracket enter into the yielded non-linear stage. Thus, it accords with the design requirement of "the column is stronger than the beam; the joint is stronger than the frame member." According to the results of the experiment and FEA, a rational proposal on the design of joints is put forward. With the aid of pole model, the concrete filled steel tubular column structure elastoplastic time history analyses was carried out to calculate its response under seimic waves. This results concords with experimental results of the model in Guangzhou University. The experimental and calculation results show: the single beam joint of the concrete filled steel tubular columns is reliable under stress. Irreversible destruction does not take place in this structure even under strong earthquake. Therefore, it can resist the seismic wave effectively.