不同耦连比的联肢钢板仓组合剪力墙抗震性能有限元分析

Finite element analysis of the seismic performance of coupledsteel silo composite shear walls with different coupling ratios

耦连比是影响联肢剪力墙结构抗震性能的重要参数。为研究联肢体系下新型钢板仓组合剪力墙的抗震性能和破坏特征,并确定该种结构较为适宜的设计耦连比取值范围,借助ABAQUS软件建立了10个不同耦连比的联肢钢板仓组合剪力墙有限元分析模型,并进行了单调推覆和循环往复加载。结果表明,不同耦连比下,联肢钢板仓组合剪力墙的抗震性能以及破坏特征存在明显差异。耦连比过小,钢连梁将首先破坏并造成联肢体系失效;耦连比过大,组合墙肢将在钢连梁耗能不充分的情况下提前破坏。因此,建议将塑性耦连比的取值范围控制在45%~50%之间,并将其与弹性耦连比的比值限制在90%以下,以确保钢连梁先于组合墙肢屈服,从而提高结构的抗震性能。

The coupling ratio is a crucial factor that affects the seismic performance of coupled shear wall structures.To investigate the seismic performance and failure characteristics of the novel steel silo composite shear wall under a coupling system,and to determine the appropriate range of coupling ratios for designing,10 finite element analysis models of coupled steel silo composite shear walls with varying coupling ratios were established through ABAQUS software.Monotonic pushover and cyclic reciprocal loading were then conducted.The results indicate significant variations in the seismic performance and failure characteristics of coupled steel silo composite shear walls with different coupling ratios.With a critically low coupling ratio,the steel coupling beams sustain premature failure,thereby leading to the failure of the coupling system;with an excessively high coupling ratio,composite wall piers are prone to an early failure when the steel coupling beams exhibit inadequate energy dissipation.Therefore,it is recommended that the plastic coupling ratio be restricted to a range of 45%to 50%.Additionally,the ratio of plastic coupling ratio to elastic coupling ratio should not exceed 90%to ensure that steel coupling beams yield in advance of combined wall piers,so as to improve the seismic performance of the structure.