【摘要】 以沈阳 -大连高速公路为工程背景 ,基于弹性动力学理论 ,采用平面应变有限单元法 ,分析了车辆荷载对含裂缝路面体的动态作用。分析过程中 ,车辆荷载简化为正弦分布柔性荷载 ;路面结构体计算模型抽象为平面应变模型 ;路面结构体为弹性的连续介质。为了反映裂尖应力、位移场的奇异性和减少模型网格数 ,在裂尖环向设置了奇异单元。通过计算得到裂尖的位移场 ,由位移外插得到 -型应力强度因子随加载时间的变化规律。同时探讨了初始裂缝长度和公路结构体材料阻尼比的变化对 -型应力强度因子分布规律的影响 ,为路面体的动态破坏研究提供了一定的理论参考更多还原

【Abstract】 Based on the theory of dynamics, the pavement with cracks in Shenyang Dalian highway under moving loads is analyzed using the finite element method. In the analysis, the load of a vehicle is simplified as a flexible load distributed in the form of sinusoid function. The computational model of the pavement is regarded as plane strain one; the medium of the pavement is continuous and elastic. In order to reflect the singularity of the stress displacement in the crack tip field and to decrease the mesh number, singular elements are adopted. Displacement field can be obtained by dynamic analysis using FEM, and the SIF (stress intensity factor) of the I type with the loading time can be obtained by the displacement extrapolation. The I type stress intensity factor varying with the initial crack lengths and damping ratios of materials is also discussed in this paper, which provides theoretical reference for the assessment the dynamic failure of the pavements.更多还原