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为了研究沥青路面结构在温度荷载作用下的疲劳损伤特性,运用通用有限元软件ABAQUS及其二次开发平台,建立了考虑路面材料非线性疲劳损伤的沥青路面结构数值计算模型。分析了沥青路面结构损伤、水平拉应力基于温度荷载重复作用,随空间与时间的变化规律,以及沥青路面裂纹形成寿命。结果表明:损伤主要分布在沥青面层;随着温变次数的增加,面层表面的损伤度呈线性增加;面层表面损伤度均随着面层模量与温变幅度的增加而增加;面层表面水平拉应力随着温度变化次数的增加,以线性特征逐步减小;面层表面水平拉应力随着面层模量与温变幅度的增加均是先增大后减小,有一个峰值点;沥青路面面层的温度型裂纹疲劳形成寿命与面层模量有关,模量越大,裂纹形成疲劳寿命越短,因此从温度疲劳寿命的角度来说,面层不宜选择模量过大的沥青混合料。
In order to study the fatigue damage characteristics of asphalt pavement structure under temperature loading, a numerical model of asphalt pavement structure considering non-linear fatigue damage of pavement materials was established by using general finite element software ABAQUS and its secondary development platform. The damage of asphalt pavement structure is analyzed. The horizontal tensile stress is based on the repeated action of temperature load, the variation with space and time, and the formation of the life of asphalt pavement crack. The results show that the damage is mainly distributed on the asphalt surface. The damage degree of the surface increases linearly with the increase of the number of temperature changes. The surface damage increases with the increase of the surface modulus and temperature. The horizontal tensile stress of the surface layer decreases linearly with the increase of the number of temperature changes. The horizontal tensile stress of the surface layer first increases and then decreases with the increase of the surface layer modulus and the temperature change range. There is a Peak point; Asphalt Pavement surface temperature fatigue crack formation life and surface layer modulus, the larger the modulus, the shorter the fatigue life of the crack formation, and therefore from the temperature fatigue life point of view, the surface should not be too modulus Large asphalt mixture.