轴压比对一字型钢管束高强混凝土组合剪力墙滞回性能影响分析

Influence of axial compression ratio on hysteretic behavior of I-shaped steel tube bundle high strength concrete composite shear wall

为评估轴压比对一字型钢管束高强混凝土组合剪力墙滞回性能的影响,设计并采用了轴压比为0、0.3、0.6、0.9的四种不同轴压比的钢管束混凝土组合剪力墙试件,采用有限元分析软件ABAQUS建立其精细化有限元模型,系统地分析了四种试件在循环荷载作用下的滞回性能。分析结果表明:随着轴压比的增大,钢板与混凝土进入塑性的面积均增大,变形也有所增加;试件的承载力随着轴压比增加而降低。钢管对混凝土的约束作用随着轴压比的增加而降低;随着轴压比的增大,试件初始刚度有所降低;钢管束混凝土组合剪力墙的耗能能力较好,所有试件等效粘滞阻尼系数均在0.4以上,试件的耗能能力随着轴压比的提高而提高。

In order to evaluate the influence of axial compression ratio on the hysteretic performance of I-shaped steel tube bundle high strength concrete composite shear wall,four specimens of steel tube bundle concrete composite shear wall with axial compression ratio of 0,0.3,0.6 and 0.9 are designed and adopted in this paper.The refined finite element model is established by using the finite element analysis software ABAQUS,and the hysteretic performance of the four specimens under cyclic load is systematically analyzed.The results show that with the increase of axial compression ratio,the plastic area of steel plate and concrete increases,and the deformation also increases;The bearing capacity of the specimen decreases with the increase of axial compression ratio.The restraint effect of steel tube on concrete decreases with the increase of axial compression ratio;With the increase of axial compression ratio,the initial stiffness of the specimen decreases;The energy dissipation capacity of concrete-filled steel tubular composite shear wall is good,and the equivalent viscous damping coefficient of all specimens is more than 0.4.The energy dissipation capacity of specimens increases with the increase of axial compression ratio.