双肢剪力墙耦合比计算方法及其应用研究

Study on calculation and application of the coupling ratio for coupled shear walls

摘要:

耦合比作为衡量联肢墙受力性能的重要参数,在国际上已逐步用来指导联肢墙的设计。为了计算弹性和塑性阶段双肢墙的耦合比并明确其合理的应用范围,通过理论推导与数值模拟结果给出了弹性和塑性耦合比的计算方法,分析了耦合比全过程变化规律和不同弹性和塑性耦合比组合下双肢墙的反应,提出了利用耦合比计算双肢墙顶点水平位移的理论公式和通过耦合比实现双肢墙理想屈服机制的建议。研究结果表明:本文弹性和塑性耦合比计算方法与双肢墙顶点水平位移理论公式是有效合理的；弹性耦合比主要由双肢墙几何尺寸所控制；塑性耦合比影响双肢墙的极限承载力和延性,应限制其上限；弹性与塑性耦合比的差值应不小于10%,以防止墙肢先于多数连梁发生屈服。通过快速计算和控制耦合比,可使双肢墙的设计更加合理与安全。

Abstract:

The coupling ratio (CR) is an important parameter that measures the mechanical behaviors of coupled walls (CWs). The design method using CR for CWs has been adopted gradually and internationally. To calculate CR in elastic and plastic stages and clarify a reasonable range for its application, a calculation method was proposed based on theoretical derivation and numerical simulation results. The variation of CR during elastic-plastic stage and the responses of CWs with different combinations of elastic and plastic CRs were analyzed. A theoretical formula for calculating top lateral displacement of CWs was put forward, and the suggestion on realizing ideal yielding mechanism for CWs by using CR was given. Results show that the calculation method of elastic and plastic CRs and the formula of top displacement were both effective and reasonable. The elastic CR was mainly controlled by the geometry of CWs, whereas the plastic CR had impacts on the ultimate strength and ductility of CWs, whose upper limit should thereby be set. The difference between plastic CR and elastic CR should be larger than 10% so as to avoid the occurrence of yielding in wall piers prior to most coupling beams. A safer and more reasonable design for CWs can be achieved by calculating and controlling CRs.