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Communication Dans Un Congrès Année : 2006

Visco-elastic modelling for asphalt pavements : Software ViscoRoute

Résumé

Huet-Sayegh model (1963) gives a set of constitutive equations of a viso-elastic material which accounts well for the behaviour of asphalt pavement layers, especially regarding thermal effects. This model allows rather good predictions of experimental data. The French pavement design method consists in a pavement mechanistic analysis based on the Burmister multilayer elastic model (1943) -LCPC Software ALIZE (1982)-. In that model the Huet-Sayegh behaviour is taken into account with its equivalent elastic modulus at the 15°C French average temperature and a 10 Hz frequency. That frequency value is assumed to be equivalent to the standard 72 km/h French vehicle speed. Such semi-analytical calculations provide relatively good stress and strain fields for heavy traffic pavements but it is less satisfactory for flexible pavements with low traffic, for high temperature gradients and for the analysis of damages under slow heavy loads. Therefore the complete visco-elastic behaviour of each asphalt pavement layers has to be taken into account. The aim of this paper is to present a thermo-visco-elastic multi-layer model using the Huet-Sayegh behaviour. By means of the Fast Fourier transform method, the equations of the model are solved in the coordinate system of the moving load. Results are successfully compared with an analytical solution, finite element results and accelerated pavement testing data. A software called ViscoRoute (i.e. ViscoRoad) based on this modelling has been developed. The second part of this work deals with the relevance of the assumption on the time-frequency equivalence of the French design method.
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hal-01538742 , version 1 (16-07-2023)

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  • HAL Id : hal-01538742 , version 1

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Armelle Chabot, Philippe Tamagny, Didier Poche, Denis Duhamel. Visco-elastic modelling for asphalt pavements : Software ViscoRoute. 10th International Conference on Asphalt Pavements (ISAP Québec 2006), Aug 2006, QUEBEC, Canada. pp.937-946. ⟨hal-01538742⟩
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