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借助大型有限元软件ABAQUS,运用三维动力有限元的方法,建立了移动荷载作用下基于土基横观各向同性的沥青混凝土路面结构的三维仿真模型,并编制了Dload和Utracload子程序来施加移动荷载。通过有限元Standard计算模块,分析和比较了移动荷载下车辆正常行驶、减速和加速情况时路面结构内部应力响应规律。分析结果表明:在移动荷载作用下,路面结构的面层主要处于三向受压状态;减速和加速情况时的垂直应力、横向应力和轮边缘下方竖直剪应力与正常行驶情况时的响应基本一致;减速和加速时产生的水平荷载对纵向应力和水平剪应力影响很大,与正常行驶相比,最大纵向拉应力分别增大了15.8倍和13.8倍,最大水平剪应力分别增大了243.0%和228.9%。分析结果可为路面结构设计和路面施工提供理论参考。
With the help of the large-scale finite element software ABAQUS, a three-dimensional dynamic finite element method is used to build the three-dimensional simulation model of asphalt pavement structure based on transverse soil isotropy under moving loads. Dload and Utracload subroutines Load. Through the finite element Standard calculation module, the internal stress response of pavement structure under normal moving, deceleration and acceleration under moving loads is analyzed and compared. The analysis results show that under the action of moving load, the pavement of pavement structure is mainly in three-direction compression state; the vertical stress, lateral stress and the vertical shear stress under the wheel rim under normal conditions of deceleration and acceleration are basically the same . The horizontal loads generated during deceleration and acceleration have a great influence on longitudinal stress and horizontal shear stress. Compared with normal driving, the maximum longitudinal tensile stress increases by 15.8 times and 13.8 times respectively, and the maximum horizontal shear stress increases by 243.0% % And 228.9%. The analysis results can provide theoretical reference for pavement structure design and pavement construction.