蝴蝶形钢板墙的抗侧刚度和承载力研究

Initial stiffness and bearing capacity of the butterfly-shaped steel plate walls

在带缝钢板剪力墙的基础上进行改进,提出了一种新型的蝴蝶形钢板墙,拟用于自复位钢框架中作为主体耗能构件。借鉴带缝钢板墙的分析方法,推导了蝴蝶形钢板墙的初始刚度及承载力理论计算公式。为验证理论计算公式的正确性,深入了解蝴蝶形钢板墙的受力性能,设计了3组不同尺寸的试件,并进行有限元分析。结果表明:理论公式计算与有限元结果符合良好;蝴蝶形钢板墙有着比带缝钢板墙更好的抗震耗能性能,控制蝴蝶杆的宽厚比b/t不超过10可以保证钢板墙良好的延性及耗能性能;试件在层间位移角大约为0.5%时即进入塑性耗能,在地震中将先于主体结构进入塑性,作为耗能构件有效地减轻了主要结构的损坏。

A new butterfly-shaped steel plate wall was proposed on the basis of steel plate shear wall with slits so as to improve the energy dissipation capacity of self-centering steel moment-resisting frames. In the light of steel plate shear walls with slits, the initial stiffness and bearing capacity theory formula of butterfly-shaped steel plate wall were proposed. To better understand the mechanical properties of the wall and verify the correctness of the theoretical formula, three groups of samples were designed, and a series of finite analysis were conducted. The result showed that the theoretical formula greatly matched the result from the finite element analysis, and that the seismic energy performance of butterfly-shaped steel plate walls surpassed the steel plate shear wall with slits;when the width-to-thickness ratios（b/t） of the butterfly links were less than 10, the wall showed good ductility and energy dissipation; when the drift was about 0.5%, butterfly-shaped steel plate walls were totally yielded,which would precede the main structure into plastic, reducing the damage to the main structures in the earth-quake; the proposed theoretical calculation formulas can give reasonable estimation of finite element analysis results.