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Seismic reliability assessment of bridges with user - defined system failure events / Leonardo Duenas-Osorio in Journal of engineering mechanics, Vol. 137 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 137 N° 10 (Octobre 2011) . - pp.680-690 Titre : Seismic reliability assessment of bridges with user - defined system failure events Type de document : texte imprimé Auteurs : Leonardo Duenas-Osorio, Auteur ; Jamie E. Padgett, Auteur Année de publication : 2012 Article en page(s) : pp.680-690 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Structural  reliability  System  reliability  Bridges  Seismic  effects  Closed-form  solutions  Retrofit  Monte  Carlo  simulation Résumé : Bridge-level failure event definitions per limit state have evolved from failure of one key bridge component as representative of the whole bridge system to failure of at least one of multiple components. However, an entire set of bridge failure event possibilities exists between these two extremes in the same limit state, such as failure of any two, any three, or any desired subset of bridge components. This paper proposes a closed-form combinatorial method to evaluate all possible ways in which bridge components can fail within and across limit states. It also highlights bridge component importance measures as key by-products of the closed-form solution. Calculations are illustrated with a particular yet illustrative system failure event, called the augmented event, which incorporates failures of at least one component in a given limit state and joint failures of multiple important components in a previous limit state. Bridges in as-built and retrofitted conditions are used to illustrate the augmentation calculation under seismic loads and the application of the proposed system reliability method. The results reveal an increase in median system fragility at the moderate limit states in the range of 4–20% relative to traditional approaches that neglect augmentation. This methodology to connect bridge components to bridge system reliability can readily support infrastructure stakeholder decision making and risk management through an efficient approach that can adapt to evolving system failure event definitions. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i10/p680_s1?isAuthorized=no [article] Seismic reliability assessment of bridges with user - defined system failure events [texte imprimé] / Leonardo Duenas-Osorio, Auteur ; Jamie E. Padgett, Auteur . - 2012 . - pp.680-690. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 10 (Octobre 2011) . - pp.680-690 Mots-clés : Structural  reliability  System  reliability  Bridges  Seismic  effects  Closed-form  solutions  Retrofit  Monte  Carlo  simulation Résumé : Bridge-level failure event definitions per limit state have evolved from failure of one key bridge component as representative of the whole bridge system to failure of at least one of multiple components. However, an entire set of bridge failure event possibilities exists between these two extremes in the same limit state, such as failure of any two, any three, or any desired subset of bridge components. This paper proposes a closed-form combinatorial method to evaluate all possible ways in which bridge components can fail within and across limit states. It also highlights bridge component importance measures as key by-products of the closed-form solution. Calculations are illustrated with a particular yet illustrative system failure event, called the augmented event, which incorporates failures of at least one component in a given limit state and joint failures of multiple important components in a previous limit state. Bridges in as-built and retrofitted conditions are used to illustrate the augmentation calculation under seismic loads and the application of the proposed system reliability method. The results reveal an increase in median system fragility at the moderate limit states in the range of 4–20% relative to traditional approaches that neglect augmentation. This methodology to connect bridge components to bridge system reliability can readily support infrastructure stakeholder decision making and risk management through an efficient approach that can adapt to evolving system failure event definitions. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i10/p680_s1?isAuthorized=no