装配式钢框架与混凝土墙体节点连接设计及抗震性能研究

Study on Design and Seismic Performance of Joint Between Prefabricated Steel Frames and Concrete Walls

为解决装配式钢框架与混凝土墙体连接节点的抗震设计问题,以石景山区北辛安社区养老及助残服务中心为研究对象,提出2种不同装配式钢框架与混凝土墙体节点连接设计,运用室内试验方法,建立物理模型,分析模型在水平低周期反复荷载作用下的动力响应特征。结果表明,钩头螺栓连接试件的滞回曲线出现反“S”形发展和“捏拢”现象,而对拉高强螺栓连接试件的滞回曲线饱满圆润,能量耗散系数和等效黏滞阻尼系数是前者的1.19倍;2种连接方式的试件骨架曲线均可划分为3个阶段,拉高强螺栓连接试件的屈服荷载、峰值荷载、极限荷载均比钩头螺栓连接试件提升了20%以上;2种工况的割线刚度曲线形状基本相同,呈反“S”形,对拉高强螺栓连接试件初始刚度远大于钩头螺栓连接试件,且位移延性系数也大幅度提升。

To solve the seismic design problem of the joint between prefabricated steel frames and concrete walls,the Beixin'an Community Elderly and Disabled Service Center in Shijingshan District was taken as the research object.Two different connection designs of the joint between prefabricated steel frames and concrete walls were proposed,and the physical models were established via laboratory tests,and the dynamic response characteristics of the models were analyzed,which subjected to horizontal low cycle loads.The results show that the hysteresis curve of the hook bolt connection model exhibits anti S-shaped development and pinching phenomenon,while the high-strength bolt connection model is full and round,with energy dissipation coefficient and equivalent viscous damping coefficient 1.19 times that of the former;the skeleton curves of the models with two connection methods can be divided into three stages.The yield load,peak load,and ultimate load of the high-strength bolt connection model are all increased by more than 20%compared to the hook bolt connection model;the shape of the secant stiffness curve for the two working conditions is basically the same,forming an inverse'S'shape.The initial stiffness of the high-strength bolt connection model is much greater than that of the hook bolt connection model,and the displacement ductility coefficient is also significantly increased.