轴心受压方钢管-钢骨混凝土组合长柱力学性能的非线性有限元分析

Mechanical behavior nonlinear finite element analysis of axially-loaded square steel tube long columns filled with steel-reinforced high-strength concrete

基于钢管-钢骨高强度混凝土轴压组合长柱轴压试验,利用大型有限元软件ANSYS建立三维有限元数值分析模型,并对建立的模型进行非线性有限元数值模拟,分析方钢管-钢骨高强度混凝土组合长柱在轴心压力作用下的力学性能。有限元计算出来的荷载-轴向应变曲线、极限承载力和延性系数与试验结果吻合较好,证明所建立三维有限元模型和分析结果是可靠有效的;在此基础上,利用有限元模拟对若干影响组合长柱受力性能的因素进行了分析。研究表明:组合长柱截面含骨率与混凝土轴心抗压强度对方钢管-高强度混凝土组合长柱的荷载-轴向应变曲线、极限承载力和延性系数有重要影响;随着方钢管厚宽比的增大,方钢管-高强度混凝土组合长柱的屈服承载力和极限承载力均有明显的增加。

Under the condition of large slenderness ratio and axially-loaded,using the finite element method ANSYS to analyze mechanical behavior of square steel tube long columns filled with steel-reinforced high-strength concrete by establishment of 3D finite element models. The finite element calculation results are in good agreement with experimental date,which prove that the finite element models are reasonable. Based on this basis,we made more nonlinear finite element analysis to analyze the influences of several geometric and material parameters on mechanical behavior of the columns. The analysis results shows that the steel-reinforced rate and the compressive strength of concrete have great influence to the mechanical behavior,and that the results of yield bearing capacity and ultimate bearing capacity of the columns increase as the width-thickness ratio of square steel tube increase.