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首先进行了高温后钢管再生混凝土轴压短柱的试验研究,在分析试验结果的基础上提出了高温后核心再生混凝土的应力一应变关系模型,模型考虑了再生粗骨料取代率和曾经历的最高温度的影响;然后采用数值方法对高温后钢管再生混凝土轴压短柱的荷栽一变形全过程关系曲线进行了计算分析,数值计算结果得到试验结果的验证;最后利用数值方法系统分析了再生粗骨料取代率、曾经历的最高温度和约束效应系数等参数对高温后钢管再生混凝土短柱轴压强度系数的影响,并提出了相应的简化计算公式,轴压承载力的简化计算结果与试验结果基本吻合。
Based on the analysis of test results, a model of stress-strain relationship of core recycled concrete after high temperature is proposed. The model takes into account the replacement rate of recycled coarse aggregate and the experienced strain Then the numerical calculation method is used to calculate the whole process curve of load-deformation of the axial compression concrete filled steel tubular reclaimed concrete columns under high temperature. The numerical calculation results are verified by the experimental results. Finally, the numerical method is used to systematically analyze the regeneration The effect of coarse aggregate replacement rate, maximum temperature and restraint effect coefficient experienced on the axial compressive strength coefficient of concrete filled steel tubular stub columns after high temperature were studied, and the simplified calculation formula and the simplified calculation results of axial compressive bearing capacity The test results are basically consistent.