半通缝连梁抗震性能有限元分析

Finite element analysis of seismic behavior of the semi seam coupling beam

连梁是连肢剪力墙结构中重要的耗能构件,当连梁的跨高比小于2时,连梁大多发生脆性剪切破坏.为了改善小跨高比连梁的变形和耗能性能,提出一种新型的连梁截面形式——半通缝连梁.借助有限元软件ABAQUS,对普通连梁、半通缝连梁及双连梁进行数值模拟.对比分析跨高比为0.75,1.0,1.25的3种类型的连梁在单调荷载作用下的承载能力和变形能力,并以跨高比为0.75的连梁为例研究3种类型的连梁在循环荷载作用下的刚度退化和耗能能力.结果表明:半通缝连梁表现出了良好的抗震性能,可以同时兼顾刚度和变形的要求.

The coupling beam is an important component of energy reduction in the shear walls structure. Studies have shown that when span-depth ratio is less than 2.0, coupling beam mostly occurs brittle shear failure. This paper presents a novel coupling beam in the name of semi seam coupling beam for improving the ductility and energy reduction. Then finite element model of coupling beams is established by ABAQUS to analyze their mechanical properties. Compared to the mechanical properties of ordinary coupling beam, semi seam coupling beam and dual coupling beam with span depth ratio of 0. 75, 1.0 and 1.25 under monotonic load, through modeling all three types of coupling beams and carrying on finite element analysis, stiffness degradation and energy dissipation capacity of coupling beam with span depth ratio of 0. 75 are studied under cyclic loading. The results show that the semi seam coupling beam acts the superiority in seismic performance, and meets requirements of both rigidity and deformability.