方钢管约束混凝土轴压短柱承载力研究

Bearing capacity of axially loaded stirrup confined concrete-filled square steel tubular stub columns

针对已有的配置圆环箍筋和螺旋箍筋的方钢管约束混凝土轴压短柱试验研究成果,采用ABAQUS有限元软件对该类方钢管约束混凝土轴压短柱进行三维实体非线性有限元分析,探讨相同截面含钢率下配置圆环箍筋和螺旋箍筋对方钢管和核心混凝土受力性能的影响,分析在方钢管含钢率相同的前提下,方钢管混凝土中配置圆环箍筋对方钢管力学性能的影响,对有限元模拟得出的混凝土中部截面的应力云图进行简化,根据截面静力平衡理论,通过大量参数分析建立方钢管约束混凝土短柱承载力计算式,结果表明,承载力计算式计算结果与试验结果吻合较好。

Based on the experimental results of square concrete-filled steel tubular( SCFT) stub columns with circular and spiral stirrup confinement under axial load,the nonlinear 3D finite element analysis on SCFT stub columns was conducted with the software ABAQUS to investigate the influence of the circular and spiral stirrup confinement with the same sectional steel ratio on the mechanical performance. The stress contours of the core concrete obtained from the analysis were simplified. Based on the static sectional force equilibrium and tremendous amount of parametric analysis,the calculation formula for the load carrying capacity of SCFT stub columns was developed. The comparison result shows that the load carrying capacity predicted by the proposed calculation formula agrees well with the test results.