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基于连续介质损伤力学理论,以环氧沥青混凝土的疲劳开裂过程为研究对象,建立了梯度增强的非局部损伤模型用于表征材料的疲劳损伤,并进行有限单元数值格式化;利用FEAP有限元软件仿真分析了环氧沥青混凝土在不同温度(10℃、20℃、30℃)、加载应变与饱水状态下小梁试件的四点弯曲疲劳试验。室内疲劳试验结果与仿真结果具有很好的一致性,表明所构建的梯度增强非局部损伤模型具有很好的可靠性。通过疲劳试验数据,回归拟合出不同温度与饱水状态下的环氧沥青混凝土的疲劳损伤参数,为环氧沥青混凝土材料在路面结构中的疲劳特性研究提供了基础材料参数。研究成果为沥青混凝土类材料的疲劳特性研究与性能设计提供了依据与借鉴。
Based on the theory of continuum damage mechanics, taking the fatigue cracking process of epoxy asphalt concrete as the research object, a gradient-enhanced non-local damage model is established to characterize the fatigue damage of the material and the finite element numerical formatting is performed. By using FEAP finite element software The four-point bending fatigue test of epoxy asphalt concrete at different temperatures (10 ℃, 20 ℃, 30 ℃), loaded strain and saturated water was simulated and analyzed. The indoor fatigue test results are in good agreement with the simulation results, indicating that the constructed gradient-enhanced non-local damage model has good reliability. Through the fatigue test data, regression fitting the fatigue damage parameters of epoxy asphalt concrete with different temperature and water saturation provides the basic material parameters for the study of fatigue properties of epoxy asphalt concrete pavement structure. The research results provide the basis and reference for the fatigue property research and performance design of asphalt concrete materials.