混凝土低周疲劳强度衰减及寿命预测方法研究

摘要

根据低周疲劳的特点,对混凝土S-N曲线进行了适当简化,在此基础上提出了一种混凝土低周疲劳强度衰减模型及寿命预测方法,并通过疲劳试验确定了相关参数.与实测的疲劳变形发展过程及Miner准则对比分析得出,提出的模型及方法适用于混凝土低周疲劳,能较好地反映出混凝土的低周疲劳损伤机理.%According to the characteristic of low-cycle fatigue, the equation of S-N curve of concrete is simplified.A new model of strength degradation and the predictor method of life period for concrete under low-cycle fatigue loading are proposed, and the necessary parameters are obtained by the fatigue test. By comparison with the evolution of the actual strain and the Miner rule, the model and method are shown to reflect the damage of low-cycle fatigue of concrete correctly.