混凝土剪力墙延性连接装配技术及抗震性能研究

Research on ductile joint assembly technology and seismic performance of concrete shear wall

为解决装配式剪力墙连接材料成本高、安装就位困难以及现场灌浆施工质量难以保证等问题,提出一种新型竖向钢结构延性连接装配式混凝土剪力墙,将钢结构连接件与钢筋网形成整体,提升结构延性和耗能能力,采用高强螺栓进行上下两片剪力墙的拼装对接,局部预留孔洞后浇混凝土实现强震后连接件的快速修复。利用拟静力方法研究了新型装配式混凝土剪力墙在水平往复加载作用下连接件的应力大小、混凝土损伤变化规律、结构滞回曲线和骨架曲线特性,并与同条件下的普通剪力墙进行了对比分析,研究发现:钢结构连接件可延缓钢筋发生屈服的时间,随着加载水平位移的增加,钢结构连接件上的应力分担增加,边缘构件钢筋应力分担比例降低;装配式剪力墙内置钢结构连接件,结构整体延性提高,在水平往复荷载作用下,结构滞回曲线呈饱满的“梭”型,刚度下降缓慢,吸收地震能量强,具有良好的塑性变形能力和耗能能力;在加载和卸载完成时,结构骨架曲线仍趋平缓,墙体具有较高的承载能力。

In order to solve the problems of high material cost,difficult installation and location of the assembled shear wall connecting parts,and difficult to guarantee the construction quality of the grouting connection,a new type of prefabricated concrete shear wall with ductile connection of vertical steel structure was presented.The steel structure connector formed an integral part with the steel bar to improve the ductility and energy dissipation capacity of the structure.The upper and lower shear walls were assembled with high strength bolts.Partially reserved holes for later pouring concrete to realize the rapid repair of connecting parts after strong earthquakes.The quasi-static method was used to study the stress of the joints,the variation of concrete damage,the hysteretic curve and skeleton curve of the new prefabricated concrete shear wall under horizontal and reciprocating loading,and the comparison and analysis with the ordinary shear wall under the same conditions were conducted.The results showed that the steel structure connectors can delay the yielding time of steel bars,with the increase of loading horizontal displacement,the stress sharing on steel structure connectors increased,while the stress sharing ratio of steel bars on edge members decreased.Due to the inner steel structure connecting parts,the overall ductility of the structure was improved.Under the horizontal reciprocating load,the hysteretic curve was a full'shuttle'shape,the stiffness dropped slowly,and the seismic energy was absorbed strongly,therefore,the wall had good plastic deformation capacity and energy dissipation capacity.When loading and unloading were completed,the skeleton curve of the assembled shear wall was still flat,so the wall had a high bearing capacity.