Simulation of Heavy Weight Deflectometer Test: Spectral Element Method vs Finite Element Method - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2020

Simulation of Heavy Weight Deflectometer Test: Spectral Element Method vs Finite Element Method

Résumé

The Heavy Weight Deflectometer (HWD) is a nondestructive testing device widely used for airfield pavement assessment. The HWD test consists in applying a wheel-representative load, generated by a falling mass, at the pavement surface. Deflections time histories are recorded by geophones located at several distances from the applied load. Inverse analysis procedures are needed to estimate layers mechanical properties, such as Young’s moduli for Linear Elastic (LE) materials or complex moduli for Linear Viscoelastic (LVE) materials. Most of inverse analysis processes consider (i) LE behaviour for pavement layers and (ii) static HWD loading. However, it has been shown that these hypotheses are leading to misestimate bituminous layers modulus and, in most cases, to poorly optimized maintenance. In order to better take into account bituminous layers behaviour, it is required to use LVE constitutive model and adapted numerical methods. This study presents a comparison between measured deflections and deflections computed using the Spectral Element Method (SEM) which was implemented during this work. The tested pavement was built within the test facility of the French Civil Aviation Technical Center (STAC). It is equipped with temperature probes at several depths within bituminous layers. The Spectral Element Method is a semi-analytical method in frequency domain. The pavement response is computed for unit load and for each frequency (from 1–200 Hz, every 1 Hz) at each geophone location, which leads to the Frequency Response Function (FRF). Then, frequency-domain deflections are obtained by weighting the FRF when calculating the Fast Fourier Transform (FFT) of the measured HWD load. This method is numerically efficient and shows good potential to solve axisymmetric multilayered problems. In particular, it allows to take into account frequency-dependent complex modulus analytical expressions. Spectral Element Method results have been validated with time-domain Finite Element Method data computed on a common pavement structure. SEM which is much faster than FEM shows great potential for further backcalculations application.
Fichier non déposé

Dates et versions

hal-04088582 , version 1 (04-05-2023)

Identifiants

Citer

Jean-Marie Roussel, Hervé Di Benedetto, Cédric Sauzéat, Michaël Broutin. Simulation of Heavy Weight Deflectometer Test: Spectral Element Method vs Finite Element Method. 9th International Conference on Maintenance and Rehabilitation of Pavements, Jul 2020, Zurich (Online event), Switzerland. pp.699-708, ⟨10.1007/978-3-030-48679-2_65⟩. ⟨hal-04088582⟩
9 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More