底部开水平缝预应力自复位剪力墙有限元模拟

FINITE ELEMENT SIMULATION OF SELF-CENTERING PRE-STRESSED SHEAR WALLS WITH HORIZONTAL BOTTOM SLITS

底部开水平缝预应力自复位剪力墙在墙体与基础连接处的两端设置水平缝,剪力墙和基础界面中间部位保持正常连接,在墙体内竖向设置无粘结预应力钢绞线提供自复位能力。通过有限元分析软件ABAQUS对低周反复加载试验中的底部开缝剪力墙进行数值模拟,介绍了建模方法及过程,将数值模拟的单调加载和往复加载结果与试验结果进行对比分析,包括骨架曲线、滞回曲线、耗能能力、预应力筋中应力变化、剪力墙底部抬升量、剪力墙混凝土应变和钢筋应力等参数。结果表明,采用的模拟方法能够在各项对比中较好吻合试验结果,证明了数值模拟的合理性和有效性,为工程应用中此类构件的精细化模拟分析提供了参考。

Horizontal slits are placed at the wall ends between the wall-foundation joint of pre-stressed shear walls, and the concrete in the middle of the wall-foundation joint remains connected. Furthermore, unbonded pre-stressed tendons are set vertically inside the wall to provide self-centering ability. Numerical models were developed using ABAQUS, the finite element analysis software package, to simulate test results of pre-stressed self-centering shear walls under cyclic loading. The modelling methods and procedures of the pushover and cyclic loading simulation were introduced. Comparisons were made between the simulation and experimental results, including skeleton curves, hysteresis curves, energy dissipation, stress in the pre-stressed steel strands, the uplift of wall toes, strain of the concrete and stress in the reinforcements. The comparison results indicate the numerical simulation results agree well with experimental results, meaning the simulation method can be used in engineering practice for precise numerical analysis.