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基于热弹性力学 ,分别考虑变温过程对沥青混凝土劲度模量的影响和由终了温度确定沥青混凝土的劲度模量的 2种情形 ,计算了降温作用下一维沥青混凝土杆的累积温度应力。通过对计算结果的对比分析得出 ,采用有限单元法计算沥青混凝土杆的累积温度应力时取子步温度值为 -1℃产生的相对误差不超过 3 %。采用平面应变有限单元法 ,就子步温度取 -1℃和由终了温度确定的沥青混凝土的劲度模量计算了道路结构体的累积温度应力 ,前者计算得到的累积温度应力明显小于后者 ,前者可以作为评判低温下沥青混凝土表面发生连续降温时是否开裂的依据。本文得出的一些结论可为分析降温对沥青混凝土道路的影响分析提供有益参考
Based on the thermoelasticity, considering the effect of temperature change on the stiffness modulus of asphalt concrete and the two cases of determining the stiffness modulus of asphalt concrete from the ending temperature, the cumulative temperature stress of one-dimensional asphalt concrete rod under cooling is calculated. The comparative analysis of the calculated results shows that when the cumulative temperature stress of the asphalt concrete pole is calculated by the finite element method, the relative error of the substep temperature value of -1 ℃ does not exceed 3%. By using the finite element method of plane strain, the cumulative temperature stress of the road structure was calculated by taking the substep temperature of -1 ℃ and the stiffness modulus of asphalt concrete determined by the final temperature. The cumulative temperature stress calculated by the former was obviously smaller than the latter, The former can be used as a basis to judge whether the cracking of asphalt concrete surface occurs continuously when the temperature is low. Some conclusions drawn in this paper can provide useful reference for analyzing the influence of cooling on asphalt concrete road