Abstract: Damage mechanics has been a new trend of solid mechanics since the sixties and seventies.With the basic concept of damage mechanics, the fatigue process of concrete is theoretically analyzed.The concept of actual stress proportion is proposed, and the fluctuation law of the actual stress during the fatigue process is discussed.From this, the fatigue damage variable is defined, and the fatigue damage equation is obtained based on the fatigue lifetime equation of the concrete materials.Furthermore, the equation that can predicts the strength excess of the concrete materials is also obtained.

Key words: concrete, fatigue, damage, strength excess

摘要： 损伤力学是60、70年代以来,固体力学的一个新的发展方向,笔者利用损伤力学的基本概念,对混凝土的疲劳过程进行了理论分析.提出了实际应力比的概念,讨论了疲劳过程中实际应力比的变化规律,并由此定义了疲劳损伤变量,得到了以混凝土材料疲劳寿命方程为基础的疲劳损伤方程,并进而得到了可以预测在疲劳过程中混凝土材料的剩余强度的方程.

关键词: 混凝土, 疲劳, 损伤, 剩余强度