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本文主要研究了混凝土在等幅和变幅受压重复应力作用下的疲劳性能,给出了计算混凝土纵向疲劳变形的计算方法,研究了加荷顺序对混凝土疲劳性能的影响,进一步验证了利用P-M线性累积损伤准则来估算混凝土在变幅重复应力作用下的疲劳破坏的适用性。
In this paper, the fatigue performance of concrete under repeated amplitude stress and constant amplitude compression is studied. The calculation method for the longitudinal fatigue deformation of concrete is given. The influence of the loading sequence on the fatigue performance of concrete is studied, and the PM utilization is further verified. The linear cumulative damage criterion is used to estimate the applicability of fatigue failure of concrete under variable amplitude repeated stress.