Based on the modulus mortification rule of continuum internal variable theory of thermodynamics connected to concrete materials under frazzle loading, a simple, reliable, better and computational efficient theoretical fatigue damage model due to formation of microvoids, microcracks, microdefects and fractal is proposed. The prescribed new theory is linked with strain-based approach where “strain” is the main domain and is capable for prediction of fatigue life of concrete as well as cementitious and brittle material. Investigational data from fatigue test were employed to validate the model, and results show that the model can describe the fatigue damage progression of concrete materials under different frazzle loadings by verifying the predicted fatigue life. Mortification of elastic modulus, damage enlargement corresponding to the normalized life, degradation of stress level from elastic to plastic and its accumulation subjected to variable frazzle loading including its verifications are well discussed.

基于在薄弱载荷作用下与混凝土材料相连的热力学连续内变量理论的模量衰减规律，提出了一种由于形成微孔，微裂纹，微缺陷和分形而形成的简单，可靠，更好，计算效率高的理论疲劳损伤模型。规定的新理论与基于应变的方法相关，其中“应变”是主要领域，并且能够预测混凝土以及胶结和脆性材料的疲劳寿命。利用疲劳试验的研究数据对该模型进行了验证，结果表明该模型可以通过验证预测的疲劳寿命来描述混凝土材料在不同碎裂载荷下的疲劳损伤进程。弹性模量的变形，