改进组合式L形钢管中核心混凝土应力-应变关系
Stress-strain relationship for the core concrete of improved composite L-shaped steel tube

在已有轴压试件试验的基础上研究改进组合式L形钢管中核心混凝土轴压应力-应变关系，详细分析核心混凝土应力-应变关系参数计算方法. 在分析主要影响参数的基础上，回归了所提应力-应变关系的参数表达式. 最后，采用所提应力-应变关系对改进组合式L形钢管混凝土柱轴压荷载-应变关系曲线进行了全过程计算. 结果表明，核心混凝土平均峰值应变计算值与试验值的比值平均值为0.9621，轴压极限荷载计算值与试验值的比值平均值为0.9728，计算曲线与试验曲线吻合程度较好，验证了所提核心混凝土应力-应变关系的合理性.
Based on the existing axial compressive test，the stress-strain relationship for the core concrete of improved composite L-shaped steel tube was studied，the parameter calculation method of stress-strain relationship was analyzed in detail，then the parameter expression of stress-strain relationship was regressed though influence analysis of main parameters，the axial compressive load-strain curves of improved composite L-shaped concrete-filled steel tubular columns were calculated with the proposed stress-strain relationship. The results show that the average ratio value of core concrete average peak strain calculated value and test value is 0.9621，the average ratio value of axial compressive load calculated value and test value is 0.9782，the calculated curves agree well with the test curves，which verify the proposed stress-strain relationship has certain rationality