双肢钢板剪力墙性能及原理

双肢钢板剪力墙(SPSW-WC)系统由与楼面梁连接的一对钢板剪力墙组成。体现两肢相互作用程度的耦合度和SPSW-WC的塑性强度是了解该系统性能和改进其设计方案的重要参数。采用塑性状态分析和数字模拟方法对单肢和多肢SPSW-WC结构的耦合度和塑性强度进行探讨。研究主要集中于结构的均匀屈服机制,对柔性连接机制也进行了简单的讨论,给出了极限强度和耦合度的解析解。采用不同参数(结构高度或层数、连接长度、耦合梁刚度)设计了32种SPSW-WC结构。采用非线性静态数值分析模型对这些结构进行研究。极限强度和耦合度的数值模拟结果与分析预测结果相一致。研究表明:耦合度对结构重量有着重大影响,特别是高度较大的结构;最大限度提高材料效率的耦合度范围为0.4～0.6。

Behavior and Mechanisms of Steel Plate Shear Walls with Coupling

The Steel Plate Shear Wall with Coupling(SPSW-WC)system consists of a pair of planar SPSWs linked together with coupling beams at the floor levels.The degree of coupling,which represents the level of interaction between the two piers,and the plastic strength for a SPSW-WC are important parameters in understanding behavior and developing designs for the system.This paper examines these two parameters using plastic analysis and numerical simulations of single story and multi-story SPSW-WC configurations.The focus is on desirable uniform-yielding mechanisms,but soft-story mechanisms are also briefly discussed,and analytical closed-form expressions are developed for ultimate strength and degree of coupling.Thirty-two SPSW-WC structures are designed with emphasis on varying the following parameters:height of the structure (number of stories),coupled length and coupling beam properties.These structures are studied with numerical models using monotonic nonlinear static analysis.Good agreement is observed between the numerical simulations and the analytical predictions for the ultimate strength and degree of coupling.The degree of coupling is shown to have a significant impact on structural weight,particularly for the taller structures studied,and the optimal degree of coupling to maximize material efficiency is found to be in the range of 0.4to 0.6.