摘要
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。
The three-dimensional dynamic finite element method （FEM） is adopted and a three-dimensional simulation model for asphalt concrete pavement with subgrade based on cross-anisotropy under moving load is established by the large-scale finite element analysis software ABAQUS. The moving load has been implemented into ABAQUS code as user subroutines Dload and Utracload. The response of the stress in the pavement structure is got by using ABAQUS/Standard code. The simulation analysis results under the common speed are compared with those during deceleration and acceleration. The results show that, under moving load, the surface course of pavement is mainly in three dimension compressive stress state; the responses of the vertical shear stress under load edge, the vertical stress and the transversal stress during deceleration and acceleration are basically consistent with those under the common speed; the horizontal loads caused by deceleration and acceleration have a remarkable effect on the longitudinal stresses and the horizontal shearing stresses. Compared with those under the common speed, the maximal longitudinal tensile stress increases by 15.8 and 13.8 times, while the maximal horizontal shearing stress increases by 243.0% and 228.9%, respectively. The results can give theoretical references to the design and construction of the pavement.
出处
《公路》
北大核心
2011年第6期13-18,共6页
Highway
基金
陕西省自然基金项目
项目编号2009JM1001
