T形钢管混凝土柱-钢梁平面框架抗震性能研究

为研究T形钢管混凝土柱-钢梁框架抗震性能，进行了两榀T形钢管混凝土柱-钢梁平面框架拟静力试验，探讨了柱轴压比对框架滞回性能的影响。试验结果表明，框架在往复荷载作用下均呈理想的梁铰破坏机制；随着水平位移荷载的增大，框架滞回曲线渐趋饱满，最终框架正负向位移延性系数均大于4.0，满足建筑结构抗震延性需求；随着柱轴压比增大，其耗能能力提高，但框架的延性下降。提出了该类框架的简化三折线恢复力模型，可为T形钢管混凝土柱-钢梁框架的深化研究及工程设计提供参考。

Experimental research on seismic behavior of concrete filled T-section steel tube columns and steel beam planar frames

To research the seismic behavior of concrete filled T-section steel tube columns and steel beam frames, two specimens were tested by quasi-static test. The influence of axial compression ratio on the frame hysteretic behavior was discussed. The experimental results show that the beam-hinge failure mechanism is realized. With the increase of horizontal load, the hysteretic curves of frames become fuller and fuller. The displacement ductility coefficients in two loading directions are above 4.0, which satisfies the seismic design requirement of building structure. Axial compression ratio is the major factor that affects frame seismic behavior. The higher the axial compression ratio is, the greater the energy dissipation capacity is, but the displacement ductility of the frame is reduced. A simple tri-linear restoring force model was proposed, which could provide the reference for the application of the concrete filled T-section steel tube columns and steel beam frame in engineering.