FINITE ELEMENT SIMULATION OF PAVEMENT DISCONTINUITIES AND DYNAMIC LOAD RESPONSE
FINITE ELEMENT SIMULATION OF PAVEMENT DISCONTINUITIES AND DYNAMIC LOAD RESPONSE
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DOI：
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发表时间：
1994
影响因子：
1.7
通讯作者：
W. Uddin;Dingming Zhang;F. Fernández
中科院分区：
文献类型：
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作者：
W. Uddin;Dingming Zhang;F. Fernández
对于路面-路基系统在动力无损检测和移动车轮荷载作用下的结构响应分析，特别是在研究劣化路面时，采用静荷载作用下的线弹性系统的假设是有问题的。给出了利用三维有限元ABAQUS程序进行参数化研究的结果；研究了路面不连续性对路面-路基模型在标准落重挠度计（FWD）荷载下表面挠度响应的影响和动力分析。建立了18.3米（60英尺）路面长度的最佳三维路面路基模型，底部有固定边界，两侧有滚轮支撑。ABAQUS静力挠度与传统弹性层分析计算的无裂缝路面静力挠度吻合较好。采用反算非线性模量的ABAQUS动力响应与实测的沥青路面FWD挠度比较合理。采用ABAQUS专用缝隙单元模拟了表层的纵向和横向裂缝。纵向裂缝路面的动态挠度比未裂缝路面高17%。
Assumption of a linear elastic system under static loading is questionable for structural response analysis of pavement-subgrade systems under dynamic nondestructive testing and moving wheel loads, especially if a deteriorated pavement is under study. Presented are the results of a parametric study using the three-dimensional finite element ABAQUS code; it investigates the effects of pavement discontinuities and dynamic analysis on the surface deflection response of a pavement-subgrade model under a standard falling-weight deflectometer (FWD) load. An optimum three-dimensional pavement subgrade model of an 18.3-m (60-ft) pavement length was established with a fixed boundary at the bottom and roller supports on the sides. ABAQUS static deflections are in good agreement with the static deflections calculated from the traditional elastic layer analysis for an uncracked pavement. The ABAQUS dynamic response using backcalculated nonlinear moduli compares reasonably with the measured FWD deflections on an asphalt pavement site. The ABAQUS special-purpose gap elements are used to simulate longitudinal and transverse cracks in the surface layer. Dynamic deflections are 17% higher for a pavement with longitudinal cracks as compared with an uncracked pavement.