不同面外约束下带缝钢板剪力墙的抗剪性能研究

SHEAR PERFORMANCE ANALYSIS OF STIFFENED STEEL PLATE SHEAR WALLS WITH SLITS

采用有限元软件ABAQUS,考虑几何非线性和面外初始缺陷的影响,对比分析钢筋混凝土板约束、刚性板约束以及无面外约束的带缝钢板剪力墙在水平荷载作用下的刚度、抗剪承载力、延性和耗能能力,并研究面外约束对带缝钢板的应力分布和面外屈曲的影响。结果表明:钢筋混凝土板可以抑制带缝钢板的弹性屈曲,降低带缝钢板的拉力带效应,提高带缝钢板剪力墙的延性、抗剪承载力和耗能能力。为了使钢筋混凝土板能更好地约束带缝钢板的面外屈曲,建议在剪力墙的小变形阶段,混凝土板不参与抗剪。

In this study,two methods of out-of-plane stiffening are introduced,one is reinforced concrete plate stiffening,and the other is rigid plate stiffening.The shear strength,stiffness,ductility and energy dissipation capacity of stiffened and unstiffened slit walls under shear loading are studied by means of nonlinear finite element analysis using ABAQUS software.Large-deflection effects and out-of-plane initial imperfection are considered.The effect of two stiffening methods on the out-of-plane buckling and stress patterns of slit steel panels are also investigated.The analysis results show that using reinforced concrete plate as a stiffening panel can effectively prevent the elastic buckling as well as development of diagonal tension field action,and significantly increase the shear strength,ductility and energy dissipation capacity.Considering the brittle shear failure of concrete itself,to better restrain the out-of-plane buckling of slit steel panels,it is suggested that the reinforced concrete plate should not be engaged in resisting the lateral-force from early stages.