Modeling of the FWD Deflection Basin to Evaluate Airport Pavements
Modeling of the FWD Deflection Basin to Evaluate Airport Pavements
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DOI：
10.1061/(asce)gm.1943-5622.0000305
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发表时间：
2014-04
影响因子：
3.7
通讯作者：
R. Tarefder;Mesbah U. Ahmed
中科院分区：
文献类型：
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作者：
R. Tarefder;Mesbah U. Ahmed
摘要落锤式弯沉仪(FWD)试验在路面表面形成弯沉盆。在不同的径向偏移量下，测量从落锤中心开始的偏转盆地的深度。这些挠度用于反算铺装层模数。现有的反算软件大多采用层状弹性理论和静力荷载，根据已知的路面弯沉计算弹性模数。然而，FWD试验载荷是动态的，层状材料可能表现出非弹性行为。这类软件中的分层弹性理论不能刻画路面的动力响应。此外，弹性理论不能准确地预测路面层中应力发展超过屈服点时的表面挠度。为此，本研究对机场道面在FWD试验条件下考虑动载和材料塑性的情况进行了有限元分析。文中给出的分析包括弹塑性弹塑性本构模型。
AbstractThe falling weight deflectometer (FWD) testing develops a deflection basin on the pavement surface. Depths of this deflection basin from the center of the falling weight are measured at different radial offsets. These deflections are used for the backcalculation of the pavement layer moduli. Most of the available backcalculation software uses the layered elastic theory and static load to calculate moduli from known pavement surface deflections. However, the FWD test load is dynamic, and layer materials may show nonelastic behavior. Layered elastic theory in these types of software cannot characterize dynamic response of the pavement. Also, elastic theory is unable to accurately predict the surface deflection whenever stress developed in any pavement layer exceeds the yield point. For this reason, this study has performed a finite-element analysis of the airport pavement under the FWD test considering the dynamic load and materials plasticity. The analysis presented here includes elastoplastic beha...