Décomposition du pseudo-profil et analyse de l'indice de rugosité international (IRI)

Abstract

In order to get the most out data from a pseudo-profile and to further develop an international roughness index (IRI) concept, a new interpretation approach of the IRI is presented. It is based on the breakdown of the initial pseudo-profile of a pavement into elementary pseudo-profiles based on various well-defined wavelengths. The underlying hypothesis to this approach is that the IRI calculated on these elementary pseudo-profiles is proportional to the contribution of each one to pavement condition. From this hypothesis, various pseudo-profile analytical techniques are presented. A few definitions and context are presented first. The following approach is then described: (i) filtering technique, (ii) calculation of the IRI for elementary pseudo-profiles, (iii) additional analytical tools. Finally, an application example describes the approach.Key words: IRI, filtering, pseudo-profile, pavement, defect, wavelength, bandwidth, profilometre, evenness.[Journal Translation]