钢骨-方钢管自密实高强混凝土短柱的轴压承载力

采用统一强度理论对轴心受压钢骨-方钢管自密实高强混凝土短柱的核心混凝土、钢管以及型钢钢骨在三向应力状态下的轴向极限承载力进行了分析;通过引入考虑厚边比影响的等效约束折减系数和考虑尺寸效应影响的混凝土强度折减系数,将方钢管对混凝土的约束等效为圆钢管对混凝土的约束,从而推导出钢骨-方钢管自密实高强混凝土短柱轴压承载力的理论计算公式;将该公式的计算结果与试验结果和已有公式的计算结果进行比较,各结果吻合良好。结果表明：该公式有很强的适用性,对发挥材料潜力、节约材料具有实际意义,并且为此类结构的研究提供了重要的依据。

Axial Bearing Capacity of Square Steel Tube Short Columns Filled with Steel-reinforced Self-consolidating High-strength Concrete

Based on the unified strength theory, the axial ultimate bearing capacities of square steel tube short columns filled with steel-reinforced self-consolidating high-strength concrete under three-dimensional stress were analyzed. By introducing the equivalent constraints reduction factor and concrete strength reduction factor, which respectively considered the influence of thickness length ratio and scale effect, the confinement of square steel tube towards concrete was equivalent to the confinement of circular steel tube towards it. Thus, the formulas for calculating ultimate bearing capacity of the square steel tube short columns filled with steel-reinforced self- compacting high-strength concrete were deduced. A reasonable match was reached by comparing the results calculated by the formulas with the test results and the calculated result of existed formulas. The result shows that the formulas have significances in exerting material potentials and saving materials, and also provide the important basis for structural analysis.