13 November 1996 Dynamic considerations in pavement layers moduli evaluation using falling weight deflectometer
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Falling weight deflectometer (FWD) test is employed by many state highway agencies for the nondestructive evaluation of pavement layers moduli. The accuracy of test results changes significantly for different pavement systems and may results in misleading conclusions. In this study, explicit finite element analysis was used to investigate the behavior of pavement layers under the action of an impact load. The time dependent dynamic responses of origin and flexible pavements were compared and significant differences in behavior were observed. Analysis of the time-histories of vertical deformations propagating through the pavement depth reveals that the displacements measured on the surface layer at standard FWD sensors' positions may not be indicative of the displacements of underlying layers. Computer results are provided for the extreme cases of fully bonded and unbonded pavement layers' interfaces. The results of the analysis reveal that the dynamic displacement patterns are much more complicated than the static ones. Animation of the model results indicates that near-surface pavement layers may behave as a set of composite plates resting on an elastic foundation in absence of bonds between the layers interfaces. If there are strong bonds, the near surface layers behave as a single composite solid resting on elastic foundation.
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Samir N. Shoukry, Samir N. Shoukry, David R. Martinelli, David R. Martinelli, Olga I. Selezneva, Olga I. Selezneva, "Dynamic considerations in pavement layers moduli evaluation using falling weight deflectometer", Proc. SPIE 2946, Nondestructive Evaluation of Bridges and Highways, (13 November 1996); doi: 10.1117/12.259129; https://doi.org/10.1117/12.259129

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