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残余承载力在火灾后型钢混凝土结构鉴定加固中起着重要的作用,通过有限元方法对型钢混凝土柱进行了火灾中升温降温传热分析,编制计算程序获得了截面最高温度场,同时计算出了不同影响参数条件下的火灾后型钢混凝土柱截面Nu-Mu相关曲线。分析了不同因素对火灾后型钢混凝土柱正截面承载力的影响,结果表明受火时间对残余承载力影响显著,含钢率和钢筋配筋率对残余承载力系数影响不大,较大的截面尺寸有利于提高残余承载力。
The residual bearing capacity plays an important role in the identification and reinforcement of steel reinforced concrete structures after fire. The steel reinforced concrete columns are heated and cooled by finite element method (FEM), and the maximum temperature field of the section is calculated and calculated Nu-Mu correlation curve of cross-section of post-fire SRC column under different influence parameters. The influence of different factors on the normal section bearing capacity of post-fire steel-reinforced concrete columns is analyzed. The results show that the fire-affected time has a significant effect on the residual bearing capacity. The steel-bearing ratio and reinforcement ratio have little effect on the residual bearing capacity. Size is conducive to improving the residual bearing capacity.