基于OpenSEES的剪力墙低周往复荷载试验的数值分析

框支剪力墙结构的广州花园酒店，原结构及改造后结构均不满足我国现行规范的抗震构造要求，为了了解改造前后结构的剪力墙抗震性能，本文作者对不同配筋与构造的剪力墙进行了低周往复荷试验，同时采用多竖向弹簧单元（MVLEM），通过二次开发编制了基于OpenSEES的剪力墙结构分析程序SWNA，通过SWNA对剪力墙结构进行低周往复试验数值模拟，结果表明该数值方法能够较很好地从宏观上模拟剪力墙弹塑性行为，包括中和轴移动，剪切变形影响、局部塑性状态及破坏机制等。MVLEM单元可以通过比较少的自由度模拟剪力墙结构，节省大量计算时间，适用于高层建筑结构的整体弹塑性分析及基于性能的抗震评定。 关键词:剪力墙 低周往复荷载试验 OpenSEES MVLEM 弹塑性分析

Numerical Analysis of Cyclic Loading Test of Shear Walls based on OpenSEES

Neither the original structure nor the altered structure of the Garden Hotel in Guangzhou accords with the ductile details of seismic design based on current Chinese codes. In order to explore the seismic performance of the original shear wall structure and the altered shear wall structure, the cyclic loading testes of the shear walls with different reinforcement ratio and constructional details are carried out. This paper presents the numerical analysis of the cyclic loading testes of shear walls with SWNA (Shear Wall Nonlinear Analysis) program. SWNA program is secondary developed based on OpenSEES and MVLEM. Compare with the testes, the numerical results confirmed the accuracy of this analysis procedure in representing the nonlinear behavior of the shear wall, such as the shifting of natural axis, shear deformation, local collapse and collapse mechanism. The analysis procedure based on MVLEM, which saves the calculating cost due to fewer DOFs, can stimulate the nonlinear behavior of the shear wall, and fit for global inelastic analysis and performance based design of tall building structure.