钢骨-组合L形钢管混凝土柱的轴压承载力

采用统一强度理论对轴心受压钢骨组合L形钢管混凝土短柱的核心混凝土、型钢钢骨在三向受压应力状态下的轴向极限承载力进行分析；根据截面形状组成特点，将L形钢管分为一个矩形和一个方形，通过考虑宽厚比对钢管的影响和引入考虑尺寸效应影响的混凝土强度折减系数，将钢管长短边非均匀约束等效为环向均匀约束，推导并建立了轴压短柱的承载力公式；在此基础上，参照钢结构设计规范，建立了中长柱轴压承载力公式。计算结果与试验结果吻合较好，验证了理论公式的正确性，并进行了短柱轴压承载力参数分析，得到了参数k及材料拉压比α、含骨率ρ对承载力的影响。结果表明：该计算式具有良好的适用性和广泛的应用性，对试验所提出的公式进行了理论上的补充。

Axial compressive bearing capacity of composite L-shaped steel tubular columns filled with steel-reinforced concrete

Based on the unified strength theory, the axial ultimate bearing capacities of composite L-shaped steel tube short columns filled with steel-reinforced concrete (CLSC-SRC) under three-dimensional stress were analyzed in this paper. According to characteristic of section shape, the column was firstly divided into one rectangle and one square steel tubular columns filled with steel-reinforced concrete. Then, considering the influence of width to thickness ratio on steel tube and a concrete strength reduction factor was introducect with scale effect. Because nonuniform constraint of the long and short edge of the steel tube was equivalent to the uniform constraint of the circumferential direction, a formula for calculation of axial compressive bearing capacity of CLSC-SRC can be developed. Finally, the formula for calculating the compression bearing capacity of the steel bone L-shaped concrete-filled steel tubular long columns was proposed referring to the code for design of steel structure. The proposed fomula was validated by comparing the calculation results with the corresponding test data. Results show that the proposed foumulations are correct and reasonabce. The effects of the parameters and Pull pressure ratio of Material and Osseous rate were obtained in the theoretical analysis. More importantly, the proposed formula has good applicability and extensive applications, offering a useful supplement to existing formulas obtained from experiments.