方钢管混凝土框架-十字加劲薄钢板剪力墙结构水平承载力研究

Research on horizontal load bearing capacity of concrete-filled square steel tubular frame-thin steel plate shear walls structure with cross stiffeners

为研究方钢管混凝土框架-十字加劲薄钢板剪力墙结构的抗震性能和水平承载力,进行了一榀缩尺比为1∶3的2层单跨方钢管混凝土框架-十字加劲薄钢板剪力墙结构的拟静力试验,得到了其破坏形态、荷载-位移滞回曲线、骨架曲线、特征荷载和位移等。利用有限元软件ABAQUS对其进行了非线性数值模拟,分析了方钢管混凝土框架-十字加劲薄钢板剪力墙的抗震性能、受力机理和破坏机制。基于试验和数值模拟结果,结合理论研究,提出了方钢管混凝土框架-十字加劲薄钢板剪力墙的水平承载力的计算式,并将其计算结果与试验、数值模拟结果进行对比。结果表明:方钢管混凝土框架-十字加劲薄钢板剪力墙具有较高的水平承载力、初始刚度及良好的延性和耗能能力,水平承载力计算式的计算结果与试验、数值模拟结果吻合较好。

In order to study the seismic behavior and horizontal load bearing capacity of concrete-filled square steel tubular frame-thin steel plate shear walls structure with cross stiffeners, quasi-static test was conducted on one 1 ： 3 scaled one-bay two-story concrete-filled square steel tubular frame-thin steel plate shear walls with cross stiffeners. Therefore, the failure pattern, load-displacement hysteretic curve, skeleton curve, the characteristic load and displacement values were obtained. The nonlinear analytical analysis was conducted by using the finite element software ABAQUS. The seismic behavior, mechanical mechanism and failure mechanism of the concrete-filled square steel tubular frame-thin steel plate shear walls with cross stiffeners were studied. Based on the experimental, numerical results and theoretical investigation, the calculating formulae of horizontal load bearing capacity of the concrete-filled square steel tubular frame-thin steel plate shear walls with cross stiffeners were proposed. The results of the formulae were compared with those of the experiment and finite element analysis. The results show that the concrete-filled square steel tubular frame-thin steel plate shear walls with cross stiffeners have considerable horizontal load bearing capacity, initial stiffness and favorable ductility and energy dissipation ability. The results of calculating formulae of horizontal load bearing capacity agree well with the results of experiment and finite element analysis.