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以方钢管混凝土柱为研究对象,从钢材及混凝土两种材料单轴受压的应力-应变关系出发,将方钢管混凝土柱截面中钢管部分与混凝土部分的内力叠加,推导了考虑长期荷载作用影响的方钢管混凝土轴心受压柱在加载过程中的荷载-应变关系的函数表达式,取函数最大值为相应参数下构件的抗压承载力值。用该计算方法计算已有文献中试验构件的承载力值,计算结果与试验结果吻合较好。结合钢管局部屈曲、截面配筋率、钢材强度及混凝土徐变量等因素,分析了长期荷载作用对构件承载力的影响,结果表明:长期荷载对方钢管混凝土柱承载力影响程度较小。
Based on the stress-strain relationship of steel and concrete under uniaxial compression, the square concrete-filled steel tube column is taken as the research object. The internal force of the concrete filled steel tube section and the concrete section are superposed. The influence of long-term load is deduced. , The function expression of load-strain relationship of square concrete-filled square steel tubular columns under loading is obtained. The maximum value of the function is the compressive bearing capacity of the member under the corresponding parameters. The calculation method is used to calculate the bearing capacity of the test members in the existing literature. The calculated results are in good agreement with the test results. The effect of long-term load on the bearing capacity of the member is analyzed. The results show that the long-term load exerts less influence on the bearing capacity of the concrete-filled steel tubular column.