基于500℃等温线法的受火后RC柱轴压承载力研究

Study on axial compressive capacity of post-fire RC columns based on 500℃ isotherm method

本文基于500°C等温线法研究了受火后钢筋混凝土(RC)柱轴压承载力.首先选取RC柱的热工参数,应用有限元分析软件ABAQUS进行热传导分析.根据热分析结果基于RC柱受火后轴压承载力计算方法得到柱受火后剩余承载力.考虑了受火时间、混凝土保护层厚度、配筋率、长细比等因素对受火后轴压柱承载力的影响.结果表明,该方法具有较高的有效性和精确度,可以应用于受火后RC柱轴压承载力计算.

The axial compressive capacity of post-fire reinforced concrete(RC)columns is studied based on the 500℃isotherm method.Firstly,the thermal parameters of RC columns are selected,and the finite element analysis software ABAQUS is used for heat conduction analysis.According to the results of thermal analysis,the residual strength of post-fire columns is obtained based on the calculation method.Considering the effect of fire duration,concrete cover thickness,reinforcement ratio,slenderness ratio and other factors on the bearing capacity of the axial compressive columns after fire.The results show that the method has high effectiveness and accuracy and can be applied to calculate the axial compressive capacity of post-fire RC columns.