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Influence of sediment layers on dynamic behavior of aged concrete dams / Indrani Gogoi in Journal of engineering mechanics, Vol. 133 N°4 (Avril 2007) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 133 N°4 (Avril 2007) . - pp.400–413. Titre : Influence of sediment layers on dynamic behavior of aged concrete dams Type de document : texte imprimé Auteurs : Indrani Gogoi, Auteur ; Damodar Maity, Auteur Année de publication : 2007 Article en page(s) : pp.400–413. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Dams  concrete  Finite  element  method  Reservoirs  Degradation  Absorption  Sediment Résumé : The assessment of response of an aged concrete dam is important for the prediction of its behavior during earthquakes, so that remedial measures can be taken at the right time to withstand future earthquakes. The assessment is necessary, since the analyses procedures may become obsolete and the state of the art may change as the time of construction and the structural material may deteriorate due to harsh environmental conditions. At the same time, the sediment will be accumulated at the reservoir bottom on the upstream side of the dam. The process of siltation depends on the reservoir topography and climatic variability, i.e., increased flood frequency and river inflow. The decision of retrofitting or strengthening the aged dam necessitates accurate analysis of the same in the presence of accumulated sediment. In this paper, an approach to include the time-dependent degradation of concrete owing to environmental factors and mechanical loading in terms of isotropic degradation index is presented. The absorption of pressure waves at the bottom of the reservoir due to the presence of sediments has been incorporated in the hydrodynamic pressure equation. The response of an aged concrete dam in the presence of sediment layers under seismic excitation is studied. The outcomes show the efficiency of the proposed algorithm. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=400&volume=133&issue=4&journalCo [...] [article] Influence of sediment layers on dynamic behavior of aged concrete dams [texte imprimé] / Indrani Gogoi, Auteur ; Damodar Maity, Auteur . - 2007 . - pp.400–413. Applied mechanics Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 133 N°4 (Avril 2007) . - pp.400–413. Mots-clés : Dams  concrete  Finite  element  method  Reservoirs  Degradation  Absorption  Sediment Résumé : The assessment of response of an aged concrete dam is important for the prediction of its behavior during earthquakes, so that remedial measures can be taken at the right time to withstand future earthquakes. The assessment is necessary, since the analyses procedures may become obsolete and the state of the art may change as the time of construction and the structural material may deteriorate due to harsh environmental conditions. At the same time, the sediment will be accumulated at the reservoir bottom on the upstream side of the dam. The process of siltation depends on the reservoir topography and climatic variability, i.e., increased flood frequency and river inflow. The decision of retrofitting or strengthening the aged dam necessitates accurate analysis of the same in the presence of accumulated sediment. In this paper, an approach to include the time-dependent degradation of concrete owing to environmental factors and mechanical loading in terms of isotropic degradation index is presented. The absorption of pressure waves at the bottom of the reservoir due to the presence of sediments has been incorporated in the hydrodynamic pressure equation. The response of an aged concrete dam in the presence of sediment layers under seismic excitation is studied. The outcomes show the efficiency of the proposed algorithm. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=400&volume=133&issue=4&journalCo [...]