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火灾后砼的强度和弹性模量损失很大，降低了钢筋砼结构的抗震能力。本文编制了火灾后已损伤钢筋砼柱的全过程分析程序，通过大量数值计算，建立了四面受火后钢筋砼柱恢复力骨架曲线特征参数的统计公式，并探讨了砼力学性质自然恢复对构件抗震性能的影响，在此基础上，对两榀火灾后框架进行了地震反应分析，得到一些有意义的结论。
After the fire, the strength and elastic modulus of the crucible are greatly lost, which reduces the seismic resistance of the reinforced concrete structure. In this paper, the whole process analysis program for damaged reinforced concrete columns after fire is compiled. Through a large number of numerical calculations, a statistical formula for the characteristic parameters of the skeleton curve of the restoring force of the reinforced concrete columns after four sides of fire is established, and the natural recovery of mechanical properties of the concrete components is discussed. On the basis of the impact of seismic performance, a seismic response analysis was conducted on the frames of the two fires and some meaningful conclusions were obtained.