Ambient and free vibration tests of the Millau Viaduct: Evaluation of alternative processing strategies

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Filipe Magalhães (Autor) FEUP; Elsa Caetano (Autor) FEUP; Álvaro Cunha (Autor) FEUP; Olivier Flamand (Autor) Outra; Gérard Grillaud (Autor) Outra

Revista

Título: Engineering Structures

Vol. 45

Páginas: 372-384

ISSN: 0141-0296

Editora: Elsevier

Indexação

ISI Web of Knowledge - 34 Citações

ISI Web of Science

Scopus - 59 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia civil

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia civil > Engenharia estrutural

Outras Informações

ID Authenticus: P-002-36B

DOI: 10.1016/j.engstruct.2012.06.038

Abstract (EN): The Millau Viaduct is an outstanding multi-span cable-stayed bridge located in southern France that opened to traffic in 2004. It is the tallest vehicular bridge in the world, with the top of a pylon rising at 343 m above the river level, and due to its total length of 2460 m, it also the longest cable-stayed bridge in the world. The present work aims to demonstrate the usefulness of ambient vibration tests performed at the commissioning stage and is specially focused on the evaluation of the efficiency and accuracy of alternative state-of-the-art processing strategies for identification of the modal parameters of the tested structure. Since both ambient and free vibration tests were performed, the modal damping ratio estimates obtained with the two testing approaches are compared. Furthermore, the natural frequencies and mode shapes provided by the ambient vibration test are correlated with modal estimates derived from a numerical model developed at the design stage. At the end, it is demonstrated that the data collected during the ambient vibration test, which only took some hours and very few resources, processed with adequate algorithms provided very useful information. It enabled the experimental identification of more than 20 natural frequencies and mode shapes that permitted the validation of their numerical counterparts and provided modal damping ratio estimates in good agreement with the values derived from the time series collected during the less economical and practical free vibration tests. (C) 2012 Elsevier Ltd. All rights reserved.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13