实腹式型钢混凝土异形柱中框架抗震性能试验研究

Seismic behavior of solid steel reinforced concrete middle frame with special-shaped columns

通过1榀两跨三层实腹式型钢混凝土(SRC)异形柱中框架的低周反复加载试验,观察其受力过程及破坏形态,分析其荷载-位移滞回曲线和骨架曲线、承载能力、层间位移角、延性、耗能以及刚度退化等力学特性。结果表明:实腹式SRC异形柱中框架属于典型的"强柱弱梁"结构,破坏机制为梁铰机制;滞回曲线饱满,破坏时结构整体位移延性系数均值达到5.5,等效黏滞阻尼系数达到0.249;抗倒塌能力强,极限弹塑性层间位移角约为1/39～1/13。实腹式SRC异形柱中框架总体上表现出良好的抗震性能,可以应用于高抗震设防烈度区的多高层建筑中。

Through the experimental study on the model of a two-bay and three-story middle frame consisting of reinforced concrete beams and solid steel reinforced concrete（SRC） special-shaped columns under low cyclic reversed loading,the failure process and pattern were observed.The mechanical behavior such as load-displacement hysteretic loops and skeleton curves,load carrying capacity,inter-story drift ratio,ductility,energy dissipation and stiffness degradation of the frame were analyzed.Test results show that the solid SRC middle frame with special-shaped columns is a typical strong column and weak beam structure.The failure mechanism is the beam-hinge mechanism.The hysteretic loops are a plump.As the frame fails,the average of the overall ductility factors is 5.5.The equivalent viscous damping coefficient is 0.249.The ultimate elasto-plastic story drift rotation is between 1/39 to 1/13,indicating a high level of collapse resistance.The solid SRC middle frame shows excellent seismic behavior,and can be adopted in the construction in high seismic fortification zones.