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为提高材料利用率与剪力墙的抗震性能,提出一种菱形孔平面钢板剪力墙,给出了简化分析模型,推导了钢板墙中蝶形带的承载力、柔度以及钢板墙整体初始弹性刚度的理论公式,并通过数值分析验证了理论公式的有效性。以开孔尺寸作为主要参数,对开孔钢板墙进行了非线性有限元模拟。结果表明:当开孔宽度适中时,开菱形孔钢板墙与带竖缝钢板墙的承载力相差较小;蝶形带存在三种平面内破坏模式,即弯曲、整体弯剪、局部剪切;当参数h/a、h/b、h/H、h/t(h为开孔高度,a为蝶形带中间截面宽度,b为开孔宽度,H为钢板高度,t为钢板厚度)分别减小时,承载力和弹性刚度都有不同程度的增大;h/a较大时,钢板剪力墙的滞回曲线较饱满,等效黏滞阻尼比较大;减小h/t会显著提高其承载力,但延性变差。
In order to improve the material utilization rate and the seismic performance of the shear wall, a diamond-shaped hole plate shear wall is proposed. A simplified analytical model is given and the bearing capacity and flexibility of the butterfly belt in the steel plate wall are deduced. The theoretical formula of elastic stiffness and the numerical analysis verify the validity of the theoretical formula. Taking the hole size as the main parameter, a nonlinear finite element simulation of the perforated steel wall was carried out. The results show that when the opening width is moderate, the bearing capacity of the diamond-shaped perforated steel plate wall is smaller than that of the steel plate with the slits. There are three in-plane failure modes of the butterfly belt, that is, bending, integral bending and partial shearing; When parameters h / a, h / b, h / h, h / t (h is the height of the hole, a is the width of the middle section of the butterfly belt, b is the width of the hole, H is the height of the steel plate and t is the thickness of the steel plate) When h / a is larger, the hysteretic curve of steel plate shear wall is more full, and the equivalent viscous damping ratio is larger. The decrease of h / t will be significantly increased Its bearing capacity, but the ductility deteriorates.