【摘要】 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。更多还原

【Abstract】 The compressive strength and modules of elasticity of concrete decrease a lot after fire. As a result, the aseismic capacity of R.C. Structures declines to some degree. In this paper, the nonlinear analysis program for fire damaged R.C. Columns is developed, and regression formulas for parameters of hysteric skeleton curves of fire damaged R.C. Columns have been given based on a great number of numeric results. Then, the effect of natural recovery of concrete mechanic properties on the aseismic capacity of columns is examined, and the earthquake response analysis has been done for two frame structures更多还原