Abstract
This work aims to look for a simplifying surface that can represent the effect of the dual wheels on the variation of the stress and deformation state prevailing during the passage of traffic loads. This was facilitated by the results of Thiam (2016) [4] obtained on the distribution of the vertical contact stress in the space described by the dual wheels. The analysis of the results of this study, on all the loading circles considered, shows that the radius loading circle equal to 0.181 m makes it possible to most probably represent the effect of the dual wheels. With this new surface, the effect of the dual wheels can be determined in 2D. The choice of this load is confirmed by a study in case of overload. Thus, the single axle with dual wheels is represented by a simplified diagram equipped on each side by a disk of radius 0.181 m. These results are obtained using a numerical simulation under Cast3M with a gravelly lateritic pavement.
Highlights
The concept of equivalent single-wheel load has long been used in the structural design of the pavement
In order to design the exchange of these loads at the equivalent single wheel load (ESWL), calculation methods have been proposed by some authors like [1] and [2]
The load circles are converted to a surface equivalent to a single loading circle so that the design criteria based on the single-wheel loading circle can still be applied
Summary
The concept of equivalent single-wheel load has long been used in the structural design of the pavement. In order to design the exchange of these loads at the equivalent single wheel load (ESWL), calculation methods have been proposed by some authors like [1] and [2]. These methods are particular adapted to the design of airport pavements. The loading of the dual wheels is described by two circles with a radius of 0.125 m and a center distance of 0.375 m The configuration of this load (2 disks spaced) does not allow to model the whole structure-loading in 2D [3]. The studies conducted as part of this work are essentially based on a numerical simulation using the Cast3M finite element calculation code
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