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通过对3根钢骨-方钢管高强混凝土柱按ISO834标准曲线升温作用后进行轴压承载力试验,探究均匀受火后以及不均匀受火后钢骨-方钢管混凝土柱的轴压力学性能。试验结果表明:相同条件下内置钢骨的方钢管混凝土柱承载力损伤程度要小于钢管混凝土柱;与钢骨-方钢管混凝土柱在均匀受火后相比,不均匀受火后试件的承载力损失程度较轻。同时在确定高温作用后钢材以及混凝土应力-应变关系的基础上,利用数值方法得出火灾作用后轴压构件轴压-应变关系曲线,试验结果验证了理论分析结果的正确性。并利用理论模型分析配骨指标、套箍指标等因素对构件火灾后钢骨-方钢管混凝土柱轴压承载力的影响,分析结果表明受火时间、截面边长以及配骨指标都对火灾后构件轴压承载力的影响较大。
The axial compressive loading tests of three steel-reinforced concrete columns under the action of the ISO834 standard curve were carried out to investigate the axial compressive mechanical properties of the steel-reinforced concrete-filled steel tubular columns after uniformly exposed to fire and inhomogeneous fire. The test results show that the bearing capacity of CFST columns with built-in steel beams under the same conditions is less than that of CFST columns. Compared with the concrete-filled steel tube columns, Lose the degree of light. Based on the stress-strain relationship between steel and concrete after the high temperature is determined, the axial-stress-strain curve of the axial compression member after fire is obtained by numerical method. The experimental results verify the correctness of the theoretical analysis. The theoretical model was used to analyze the influence of the parameters of the biceps and cuffs on the axial compressive bearing capacity of steel-reinforced concrete filled steel tubular columns after fire. The results show that the time of fire exposure, The bearing capacity of the member axial compression is greater.