混合暗支撑联肢剪力墙非线性有限元数值模拟

Nonlinear FEM numerical simulation of concrete coupled shear wall with mixed concealed bracings

混合暗支撑联肢剪力墙是一种新型延性双肢剪力墙,其在地震作用下受力机理复杂,故准确模拟其非线性受力过程是结构抗震分析的重要课题。本文利用先进的数值模拟技术,在已有试验研究的基础上,对混合暗支撑联肢剪力墙进行合理建模,并系统分析了轴压比、配筋率、高宽比和连梁刚度等对混合暗支撑联肢剪力墙承载力和变形性能的影响规律。分析结果表明,数值模拟结果和试验结果吻合较好;轴压比、配筋率对混合暗支撑联肢剪力墙的弹性和弹塑性性能影响显著;连梁刚度主要影响混合暗支撑联肢剪力墙开裂后的性能;而高宽比既影响混合暗支撑联肢剪力墙的承载力和变形性能,又决定着混合暗支撑联肢剪力墙的破坏形式。研究结果对混合暗支撑联肢剪力墙的地震弹塑性计算具有一定的参考价值。

Concrete coupled shear wall with mixed concealed bracings is a new type of energy dissipation shear wall. Therefore, how to accurately simulate the nonlinear behaviors of this proposed shear wall is an important prob- lem in seismic analysis of structures. Based on the existing experimental data and the advanced numerical simulation technique, finite element model of concrete coupled shear walls with mixed concealed bracings are established rea- sonably. Then the influence of axial compression ratio, reinforcement ratio, ratio of height to width and stiffness of coupling beams on the capacity and deformation performance of the proposed shear wall are analyzed systemically. The results fi＇om the simulation match well with those from the tests. The axial compression ratio and reinforcement ratio have apparent effect on the elastic and inelastic behavior of the proposed shear wall; stiffness of coupling beams mainly have effect on the post-cracking behavior of the proposed shear wall;the ratio of height to width not only has effect on the capacity and deformation performance, but also determines the failure modes of this new shear wall.