装配式与现浇钢筋混凝土联肢剪力墙基础隔震结构受力性能对比研究

Studies of mechanical performances of precast concrete coupled shear wall base-isolated structures compared with cast concrete coupled shear wall base-isolated structures

本文旨在对装配式钢筋混凝土联肢剪力墙基础隔震结构与现浇钢筋混凝土联肢剪力墙基础隔震结构受力性能进行对比研究,采用ABAQUS有限元分析软件,对4组不同高宽比的装配式和现浇联肢剪力墙基础隔震结构进行了非线性有限元分析。研究结果表明:装配式和现浇联肢剪力墙基础隔震结构的骨架曲线、刚度退化、破坏模式基本相同;然而结构进入塑性阶段后,装配式隔震结构底部剪力墙接缝张角逐渐明显,装配式隔震结构底部三层剪力墙的纵筋屈服数量小于现浇隔震结构;随着位移的增大,装配式隔震结构由于接缝张角引起的顶点水平位移占比达到10%左右,装配式隔震结构的隔震层转动引起水平位移占比小于现浇隔震结构。

This paper aims to compare the mechanical performances of base-isolated precast concrete coupled shear wall structures with base-isolated cast concrete coupled shear wall structures.Finite element software ABAQUS is used to conduct nonlinear finite element analysis on four groups of base-isolated precast concrete coupled shear wall models and base-isolated cast concrete coupled shear wall models with different aspect ratio.It can be found that the skeleton curves,stiffness degradation and failure mode of base-isolated precast models are almost same as the base-isolated cast models.However,the opening angle of joint connections at the bottom shear walls in the base-isolated precast structures becames more obvious after the structure reached their ultimate strength.Moreover,the yielding number of longitudinal reinforcement in the bottom shear walls of precast base-isolated structures are less than that in cast baseisolated structures.The lateral displacement caused by the joint opening angle can occupy 10%of the lateral displacement of superstructure in precast base-isolated structures,and the lateral displacement proportion caused by the rotation of the isolation layer of the precast base-isolated structures is smaller than that of cast base-isolated structures in later plastic stage.