混凝土的受压疲劳性能研究

FATIGUE OF PLAIN CONCRETE UNDER COMPRESSION

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。

This paper studied the fatigue properties of plain concrete under compressive repeated loading with constant and variable amplitude. Two formulas for evaluating the fatigue life of concrete under compressive repeated loading with constant amplitude were proposed.Both the development of fatigue strain and the criterion for assessing fatigue damage of concrete under repealed compressive loading were also analysed.This paper also studied the effect of the loading sequence on the fatigue properties of concrere. Analysis of the development of fatigue strain shows that the basic assumption,i.e. the strain uniqueness assumption, used in calculation of longitudinal, residual and total strain of fatigue is accurate enough, and the P-M criterion can be approximately used in the analysis of fatigue damage of concrete under repeated loading with variable amplitude.