实腹式型钢混凝土异形柱边框架抗震性能试验研究

为研究实腹式型钢混凝土(SRC)异形柱边框架的抗震性能,对1榀两跨三层的框架模型进行低周反复荷加载试验。观察结构的受力过程及破坏形态,并分析结构的荷载-位移滞回曲线和骨架曲线、承载能力、层间位移角、延性、耗能及刚度退化等力学特性。结果表明:实腹式SRC异形柱边框架破坏时形成梁铰机制,符合"强柱弱梁"的要求;滞回曲线饱满,刚度退化小;破坏时,等效黏滞阻尼系数和位移延性系数分别大于0.24和5.3;弹塑性极限层间位移角大于抗震规范规定的限值,抗倒塌能力强。实腹式SRC异形柱边框架显示出良好的抗震性能,可以应用于高抗震设防烈度区的建筑以及高层建筑中。

Experimental study on seismic behaviors of solid steel reinforced concrete edge frame with special-shaped columns

In order to investigate the seismic behaviors of solid steel reinforced concrete edge frames with special-shaped columns,a model of two-bay and three-story frame was tested under low cyclic reversed loading.The failure process and patterns were observed.The mechanical behaviors 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 failure mechanism of the solid SRC edge frame with special-shaped columns is the beam-hinged mechanism,satisfying the seismic design principle of "strong column and weak beam".The hysteretic loops are plump,and the stiffness degradation of the structure is insignificant.As the frame fails,the equivalent viscous damping coefficient and the ductility factors may exceed 0.24 and 5.3,respectively.The ultimate elastic-plastic story drift rotation is larger than the limit value specified by the seismic code,indicating the high capacity of collapse resistance.The solid SRC edge frame shows excellent seismic behaviors,and can be adopted in high-rise buildings and constructed in high seismic fortification zone.