本文主要研究高强混凝土在等幅和变幅重复荷载作用下的轴心受压疲劳性能.在试验的基础上,分析了高强混凝土在等幅重复荷载下的疲劳强度和疲劳变形规律,给出了疲劳强度、纵向总应变和残余应变的经验公式,并提出以残余应变判断疲劳破坏的建议公式.同时,与普通强度混凝土的疲劳性能进行了试验比较.对变幅重复荷载下判断混凝土疲劳破坏的P—M准则提出了修正建议. This paper mainly studies the axial compressive fatigue properties of high-strength concrete subjected to constant amplitude and variable amplitude repeated loads. On the basis of the tests, the fatigue strength and fatigue deformation law of high-strength concrete under repeated amplitude loads are analyzed. The empirical formulas of fatigue strength, longitudinal total strain and residual strain are given, and the formula for determining fatigue failure by residual strain is proposed. At the same time, the fatigue performance of ordinary strength concrete is tested and compared. The fatigue failure of concrete is determined under variable amplitude repeated load. The P-M criterion proposes amendments.