论文部分内容阅读
为了分析沥青混凝土路面Top-Down开裂机理,基于ABAQUS有限元分析方法,综合考虑老化和温度梯度造成的沥青路面内部模量梯度、突然降温、轮胎边缘的应力集中等因素,选取春季、夏季和冬季3个季节,及未老化缓慢降温、老化后忽然降温和老化后缓慢降温3种情况,建立了9个沥青混凝土路面结构有限元模型。对不同工况下沥青混凝土路面最大拉应力和剪应力的大小及位置进行了分析。结果表明:对于未老化缓慢降温和老化后缓慢降温的沥青混凝土路面,剪应力过大是沥青混凝土路面开裂的主要原因;对于老化后忽然降温的沥青混凝土路面,由于剪应力无明显变化,拉应力增加较多,拉应力过大是沥青混凝土路面开裂的主要原因。
In order to analyze Top-Down cracking mechanism of asphalt pavement, based on the ABAQUS finite element analysis method, taking into account factors such as the gradient of internal modulus of asphalt pavement caused by aging and temperature gradient, sudden cooling, and stress concentration at the edge of the tire, spring, summer and winter Three seasons, and slowly cooling without aging, suddenly cooling after aging and slow cooling after the three cases, the establishment of 9 asphalt concrete pavement finite element model. The maximum tensile stress and shear stress of asphalt concrete pavement under different working conditions were analyzed. The results show that for asphalt concrete pavement, the asphalt concrete pavement with slow cooling and slow cooling after aging is the main reason for the cracking of asphalt pavement. For the asphalt concrete pavement which is suddenly cooled after aging, there is no obvious change in tensile stress Increase more, too much tension stress is the main reason for cracking of asphalt concrete pavement.