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现有钢筋混凝土构件的抗力时变模型,多是关于仅受弯的梁式构件,对偏压构件的考虑较少。针对此不足,首先分析了影响偏压构件抗力的各因素的时变模型。在此基础上,计算了不同参数情形下偏压构件抗力退化的若干数值特征,得出钢筋锈蚀后偏心距较大时抗力均值的下降程度会大一些,同时整个服役期内偏压构件的破坏模式可能会发生改变的结论。最后采用数值拟合方法研究了钢筋锈蚀下偏压构件的抗力退化模型。结果表明,采用三次多项式函数模型来描述抗力均值和标准差的时变规律具有较高的精度。
The resistance time-varying model of the existing reinforced concrete members mostly relates to beam members that are bent only, and less to the bias members. In response to this problem, the time-varying model of each factor affecting the resistance of the biasing member is first analyzed. On this basis, some numerical characteristics of the resistance degradation of the biasing members under different parameters are calculated. The results show that the larger the eccentricity of the steel bars, the greater the decrease of the mean value of the resistance will be. At the same time, the failure of the biasing members over the entire service life The pattern may change the conclusion. Finally, the numerical simulation is used to study the resistance degradation model of the biased members under corroded steel bars. The results show that using the cubic polynomial function model to describe the time-varying law of resistance mean and standard deviation has high accuracy.