为研究SRC-RC竖向混合结构中转换区域的抗震性能, 设计2榀试验模型, 其中一榀模型的上下两层砌筑有填充墙.通过低周反复荷载试验, 研究模型的损伤破坏与性能指标, 分析填充墙对转换区域抗震性能的影响, 获得滞回曲线, 承载力, 侧移角, 延性系数等关键性能指标.无墙框架的滞回曲线饱满, "捏缩"效应不显著, 而填充墙框架的滞回环则表现出明显的"捏缩"效应, 曲线中部出现了明显的滑移段, 该段内荷载基本保持不变而位移持续变化, 填充墙开裂后模型的承载力丧失迅速.虽然两个模型的屈服位移差别不大, 无墙框架的塑性发展能力明显好于填充墙框架, 在屈服阶段和破坏阶段, 填充墙极大的限制了侧移的发生, 导致塑性发展阶段明显缩短.下层柱脚和上层柱顶都形成塑性铰后框架失效, 表现出"强剪弱弯"形态的破坏.填充墙使更多的箍筋达到屈服, 框架表现出更显著的剪切受力特征.%In order to study the seismic performance of the SRC-RC vertical hybrid structure, two test models were designed. The upper and lower stories of one model were filled with masonry walls. The low-cyclic repeated loading test was conducted to study the damage failure and performance indices of the model. The influence of the infilled wall on the seismic performance was analyzed, and the key performance indices such as hysteresis curve, bearing capacity, drift ratio and ductility coefficient were obtained. Hysteresis curve of the frame without infilled walls was full, and the "pinching" effect was not remarkable. For the frame with infilled walls, the significant "pinching" effect could be observed in the hysteresis loop, and the obvious slip appeared in the middle of the curve. The bearing capacity of the frame with infilled walls decreased quickly after cracking of walls. Although yield displacements of two models are close, the plastic development ability of the frame without infilled walls is remarkably superior to that of the frame with infilled walls. In the yield stage and the failure stage, the infilled walls greatly restrain the lateral movement of the frame, which leads to the obvious shortening of the plastic development stage. Frame fails when the plastic hinges are formed at the column bottom of the lower storey and the column top of the top storey, exhibiting the failure pattern of strong shear and weak bending. More stirrups may yield due to the infilled walls, and prominent shear characteristics of the frame can be observed.
展开▼
