基于循环软化膜模型的新型联肢剪力墙非线性仿真分析及试验验证

Nonlinear simulation analysis of new coupled shear wall based on cyclic softened membrane model with experimental verification

剪力墙结构的非线性仿真分析是研究的一个热点和难点。多年来尽管学者们已经提出了多种不同的非线性模型,然而精确地模拟剪力墙的非线性滞回性能仍然较难实现。文章基于一种剪力墙循环软化膜单元,针对作者提出的一种新型可更换连梁,提出了带可更换连梁的新型剪力墙在OpenSEES程序中的建模方法,即用循环软化膜单元和纤维模型组合模拟剪力墙墙肢,采用Hysteretic材料本构模拟保险丝的剪切滞回规律,对保险丝的抗弯和轴向承载力通过多根桁架单元模拟。计算结果与试验结果对比表明,该模拟方法可以比较精确地预测剪力墙的"捏拢"效应、峰值承载力和延性及反映骨架曲线和滞回曲线的形状。这种模拟方法对类似的联肢剪力墙结构的数值模拟具有很好的借鉴意义。

The research on nonlinear simulation of coupled shear wall is a hot spot and difficult point all the time. In the past decade, although researchers have proposed various nonlinear numerical models for shear walls, it is still not easy to precisely simulate the hysteretic performance of shear wall. In order to provide a solution, firstly, a uniaxial constitutive relationship of concrete for cyclic softened membrane model was introduced, and then a model- ing approach of a new proposed shear wall was established. The modeling approach was based on combining cyclic softened membrane model with fiber model to simulate shear wall limbs, applying hysteretic material model to simu- late hysteretic performance of fuse, and using several truss elements to simulate the fuse. It can be found by the comparison of computational results with experimental results that the simulation methods can precisely predict the pinching effect, peak bearing capacity and ductility of new shear wall. Thus, it is hoped that the proposed simula- tion methods can be widely used to simulate similar shear wall structures in future.