钢骨-圆钢管高强混凝土组合长柱轴心受压分析

为了研究钢骨-圆钢管高强混凝土组合长柱轴心受压的力学性能,采用ABAQUS软件建立钢骨-圆钢管高强混凝土组合长柱轴心受压有限元分析模型,讨论了组合长柱典型试件荷载-变形关系曲线,不同受力阶段应力分布规律及最终破坏模态.通过进行参数分析,考虑不同参数对组合长柱轴心受压力学性能的影响,利用回归分析得到组合长柱轴心受压承载力简化计算公式.结果表明,混凝土强度、配骨指标和钢材强度对组合长柱轴心受压承载力影响较大,长细比影响较小,简化公式计算结果与有限元计算结果及试验结果吻合良好.

Finite element analysis for circular steel tube composite slender column filled with steel-reinforced high-strength concrete under axial compression

In order to study mechanical properties of circular steel tube composite slender column filled with steel-reinforced high-strength concrete under axial compression, an finite element analysis model for the circular steel tube composite slender column filled with steel-reinforced high-strength concrete under axial compression was established with the software ABAQUS, and the load versus deformation relationship curve, stress distribution rule in different loading stages and final failure mode of typical specimens were discussed. Through the parametric analysis, the influence of different parameters on the mechanical properties of composite slender column under axial compression was considered. In addition, the simplified bearing capacity calculation formula of composite slender column under axial compression was obtained with the regression analysis method. The results indicate that the strength of concrete, index of structural steel and strength of steel have significant effect on the bearing capacity of composite slender column under axial compression, while the slenderness ratio exhibits small influence. Furthermore, the results calculated with the simplified formula are in good agreement with those obtained with both finite element analysis and tests.