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为研究高温后钢管再生混凝土短柱的轴压力学性能,利用ABAQUS有限元软件对轴压受力性能进行了理论分析和试验验证,对比分析了曾经历的不同温度和不同取代率对荷载-应变全过程曲线的影响,揭示了高温后轴压承载力折减系数的主要影响因素。研究结果表明:随着曾经历温度的升高和取代率的增加,钢管再生混凝土短柱的承载力整体上呈下降趋势,温度在500℃以上对承载力影响较大,而取代率对承载力的影响较小,且随曾经历温度的升高,影响幅度越小;含钢率、钢材屈服强度、核心混凝土抗压强度对高温后的轴压强度系数有显著影响,而取代率没有影响。
In order to study the axial compressive mechanical properties of short recycled concrete columns after high temperature, the ABAQUS finite element software was used to analyze the theoretical analysis and experimental verification of the axial compressive properties. Comparisons were made between the different temperatures and different substitution rates that have been experienced. The whole course of the curve, reveals the main factors that affect the reduction factor of bearing capacity under high temperature. The results show that with the increase of temperature and replacement rate, the bearing capacity of recycled concrete short columns decreases as a whole. The temperature above 500 ℃ has a great influence on the bearing capacity, The influence of the steel temperature, the yield strength of the steel and the compressive strength of the core concrete on the axial compressive strength coefficient after high temperature have a significant effect, while the replacement rate has no effect.