自复位预应力剪力墙抗震性能实体和平面单元有限元分析

Finite element analysis with solid and plane element of seismic performance of self-centering pre-stressed shear walls

自复位剪力墙结构是墙体底部与基础间无竖向钢筋贯通,而采用无黏结预应力筋将墙体与基础相连接的结构形式,也是可恢复建筑功能结构体系中的重要组成部分。剪力墙在承受侧向荷载时墙体底端角部抬升,并依靠重力荷载和无黏结预应力筋提供恢复力。采用ABAQUS软件对一个自复位剪力墙的伪静力试验进行实体单元、平面应力单元及薄壳单元的有限元模拟并与试验结果对比,同时对三种单元的计算效率和精度进行对比。结果表明:有限元模拟方法能较好地反映自复位预应力剪力墙的滞回性能、无黏结预应力筋的应力和混凝土的应变等各项指标。验证了在动力显式分析中采用壳单元进行结构模拟的可行性和合理性。

Self-centering shear wall structure has no vertical reinforcement at the wall-foundation interface and uses the unbonded pre-stressed tendon to connect the wall to the foundation; it is an important part of the resilient structural system. Lateral displacements result in a separation gap forming at the wall-foundation connection and gravity loading and pre-stressed unbounded tendons provide the restoring force in the shear wall. Finite element analysis was done by using ABAQUS software to simulate the seismic performance of a cyclic loading test with solid element,plane stress element and shell element,and the results of simulation were compared with the test results and compared with each other in accuracy and efficiency. The results indicate that the simulation methods used could capture the hysteresis behavior,the stress of unbounded pre-stressed tendon and the stress / strain parameter of the self-centering pre-stressed walls,and it is proved reasonability and feasibility to make the structural simulation with shell element in dynamic explicit analysis.