Authors: Yang, Chaochao; Newhook, John

Source: Canadian Journal of Civil Engineering, Volume 34, Number 3, March 2007 , pp. 378-388(11)

Publisher: NRC Research Press

Abstract:

The ISIS Canada Networks of Centres of Excellence (NCE) program has focused on two main themes to improve civil engineering infrastructure, namely innovative construction technologies, and structural health monitoring (SHM). The former began with the construction of the first field application of the innovative steel-free concrete bridge deck slab technology at the Salmon River bridge, Nova Scotia, in 1995. Although this bridge has continued to function safely under heavy traffic loads, it has developed characteristic longitudinal cracking of the concrete between adjacent girders due to fatigue. This paper describes the recent research to develop an SHM model for monitoring the impact and stability of this cracking. Theoretical and experimental models were used to examine the change in response as cracking develops. A global load distribution matrix was proposed, and the variation in load distribution values with cracking was used to develop a cracking index that can be employed in monitoring the field structure.Key words: structural health monitoring, bridges, concrete, deck slabs, cracking, load distribution.

Le programme « NCE » d'ISIS Canada (« Intelligent Sensing for Innovative Structures ») portait sur deux thèmes principaux dans le but d'améliorer les infrastructures de génie civil : les technologies de construction innovatrices et la surveillance de l'état des structures (« SHM »). Ces premières ont débuté avec la construction de la première utilisation sur le terrain de la technologie innovatrice de dalles de tablier de pont en béton sans acier, ce fut dans le pont de Salmon River, en 1995. Bien que ce pont ait continué de fonctionner en toute sécurité sous de gros volumes de circulation, il a développé des fissures longitudinales caractéristiques dans le béton entre des poutres adjacentes, en raison de la fatigue. Le présent article décrit la recherche récente visant à développer un modèle « SHM » pour le suivi de l'impact et de la stabilité de cette fissuration. Des modèles théoriques et expérimentaux ont été utilisés pour examiner le changement de réponse lors du développement des fissures. Une matrice de distribution globale des charges a été proposée et la variation de ces valeurs avec la fissuration a servi à développer un indice de fissuration qui peut être utilisé pour effectuer le suivi des structures sur le terrain.Mots-clés : surveillance de l'état des structures, ponts, béton, tabliers de pont, fissuration, distribution des charges.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2007-03-01

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• Published since 1974, this monthly publication is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structure engineering, construction engineering, engineering mechanics, and engineering materials, and a history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academe. New developments in engineering design and construction are also featured.
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