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Author(s): Bruno J. Afonso Costa
Filipe Magalhães
Álvaro Cunha
Joaquim Figueiras
Title: Modal analysis for the rehabilitation assessment of the Luiz I Bridge
Issue Date: 2014
Abstract: Dynamic testing in the condition assessment of existing bridges to support their rehabilitation and strengthening designs is becominga common procedure, yet additional dynamic testing after rehabilitation is rare. Nevertheless, combining the results of dynamic testing beforeand after bridge rehabilitation produces unique and valuable information regarding changes occurred in a bridges dynamic properties.Such dual testing would allow researchers to verify the behavior predicted at the design stage and to assess the stiffness variation, which wouldeliminate the need for mandatory field static testing. This article reports the modal analysis of a unique centenary steel-arch bridge that wasrecently rehabilitated and strengthened. The ambient vibration test conducted after the construction works is described, and the data arecompared with those collected before the rehabilitation. Structural identification is completed by means of experimentally validated threedimensional(3D) finite-element (FE) models simulating both phases. The results bring to light important findings concerning variation in bridgestiffness, changes in the modal parameters, and the impact of support conditions and structure of decks in bridge dynamic properties.
Subject: Engenharia estrutural, Engenharia civil
Structural engineering, Civil engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia civil
Engineering and technology::Civil engineering
Document Type: Artigo em Revista Científica Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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