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基于地震作用下钢筋混凝土结构的损伤机理,通过分析纵筋的塑性低周疲劳损伤,建立了钢筋混凝土柱低周疲劳弯曲变形性能损伤计算模型。根据已有相关试验研究,对钢筋混凝土柱低周疲劳作用下的割线刚度损伤进行分析,确定了计算模型参数,得到了构件割线刚度和抗力的衰减规律计算公式。分析了低周疲劳效应对钢筋混凝土柱弯曲变形性能的降低影响,提出了考虑低周疲劳影响的极限变形折减系数计算公式。从而可以根据塑性位移循环疲劳寿命的分析,直接计算出钢筋混凝土柱低周疲劳作用下的割线刚度、抗力及极限变形,可为震后钢筋混凝土柱的性能评估提供理论支持。
Based on the damage mechanism of reinforced concrete structure under earthquake action, a plastic low-cycle fatigue damage model of longitudinal reinforcement was established to calculate the low-cycle fatigue bending damage of reinforced concrete columns. According to the relevant experimental research, the damage of the secant rigidity under the low cycle fatigue of reinforced concrete column is analyzed, the parameters of the model are determined, and the formulas for calculating the attenuation law of the secant rigidity and resistance of the member are obtained. The effect of low cycle fatigue on the bending deformation of reinforced concrete columns is analyzed. The calculation formula of the ultimate deformation reduction coefficient considering the effect of low cycle fatigue is proposed. Therefore, according to the analysis of cyclic fatigue life of plastic displacement, the secant stiffness, resistance and ultimate deformation of reinforced concrete columns under low cycle fatigue can be directly calculated, which can provide theoretical support for the performance evaluation of post-earthquake reinforced concrete columns.