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提出一种矩形钢管混凝土短柱轴压承载力计算的新方法。与已有的计算方法不同之处在于,所提出的方法考虑了矩形钢管截面长边、短边对核心混凝土约束作用大小不同的特点,应用基于混凝土真三轴受力试验的破坏准则确定管内核心混凝土的峰值强度;同时,考虑矩形钢管截面长边、短边的竖向强度的差异,分别计算矩形钢管长、短边的竖向强度。应用新方法对56根矩形钢管混凝土柱试件的轴压承载力进行计算,计算结果与试验结果比较表明,两者吻合良好。
A new method for calculating the axial bearing capacity of concrete filled rectangular concrete filled steel tubular columns is proposed. The difference between this method and the existing one is that the proposed method takes into account the different confinement effects of the long and short sides of the rectangular steel tube to the core concrete. The failure criterion based on the true triaxial concrete stress test determines the core of the tube Meanwhile, considering the difference of the vertical strength of the long and short sides of the rectangular section of steel pipe, the vertical strength of the long and short sides of the rectangular steel pipe is calculated respectively. A new method was used to calculate the axial compressive bearing capacity of 56 concrete-filled rectangular steel tubular specimens. The calculated results and the experimental results show that the two agree well with each other.