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火灾后混凝土构件的剩余刚度是混凝土结构变形性能和抗震分析的重要指标,也是火灾后混凝土构件修复和加固的重要依据之一。该文基于等效弹性模量法、改进分段模型法以及参数反演法方法等计算了标准火灾作用后混凝土构件的剩余刚度,分析了受火时间、含钢率和截面尺寸等因素对剩余刚度的影响规律。计算表明该文发展的三种方法可以方便有效地计算火灾作用后混凝土构件的剩余刚度,这些估计方法及其所得结果可供有关混凝土结构工程设计时参考。
The residual stiffness of concrete members after fire is an important index of deformation performance and seismic analysis of concrete structures and is also an important basis for the repair and reinforcement of concrete members after fire. Based on the equivalent elastic modulus method, the improved piecewise model method and the parameter inversion method, the residual stiffness of concrete members after a standard fire is calculated. The effects of fire exposure time, steel content and cross-sectional dimensions on residual Stiffness of the law of influence. The calculation shows that the three methods developed in this paper can calculate the residual stiffness of concrete members after fire easily and effectively. The estimation methods and the results obtained are suitable for the design of concrete structures.