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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。
In order to study the seismic behavior of T-shaped CFST-steel beam frame, the pseudo-static test of T-shaped CFST column-steel beam planar frame is carried out and the influence of column axial compression ratio on hysteretic behavior of frame is discussed. The experimental results show that the frame has an ideal beam-hinge failure mechanism under cyclic loading. With the increase of horizontal displacement load, the hysteresis curve of the frame becomes full and the positive and negative displacement ductility coefficients of the final frame are both greater than 4.0, As the axial compression ratio increases, the energy dissipation capacity increases, but the ductility of the frame decreases. The simplified three-fold line restoring force model for this type of frame is proposed, which can provide reference for deepening research and engineering design of T-shaped CFST-steel beam frame.