基于莫尔强度理论的钢管混凝土轴心受压短柱承载力计算

Strength calculation of concrete-filled steel tublar short columns under axial compression based on mohr's strength theory

对钢管混凝土中核心混凝土的应力状态进行了分析,给出了圆形、矩形两种截面中钢管侧压应力的计算方法和近似公式,应用线性莫尔强度准则导出了核心混凝土的强度条件,表明钢管的侧压对提高核心混凝土的强度是有利的。并以此为基础,建立了轴心受压圆形、矩形截面钢管混凝土短柱的极限承载力计算公式,计算结果与有关文献的试验数据吻合良好,说明线性莫尔强度准则对钢管混凝土有很好的适用性。

The analysis of the stress state for core concrete in concrete-filled steel tubes is carried out. The computational method and approximate formulas of stresses in circular, rectangular section steel tubes subjected to side compression are given. The strength condition is deduced using Mohr＇s linear strength criteria. Results show that the side compress of the steel tubes contributes to the enhancemeni of core concrete strength. On that basis the computational formulas of ultimate capacity force for concrete filled circular, rectangular section short columns are established. The results arc in line with experimental datum in the corresponding literature. Mohr＇s linear strength criteria is appropriate for the concrete filled steel tubes.