Seismic Improvement of Concrete Gravity Dam Strengthened by Asphalt Buttressing

In the present study, seismic analysis of concrete gravity dams strengthened by asphalt buttressing is presented for improving the seismic behavior of the Koyna dam in India subjected to Koyna ground motion. Fluid-Structure interaction is modeled including water compressibility and reservoir bottom...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Amir Pirooznia, Amir javad Moradloo
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2019
Materias:	asphalt buttressing concrete gravity dam nonlinear analysis seismic rehabilitation smeared crack Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/ab42b2d71b984b8fa8d8a9662c7b9e67
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:ab42b2d71b984b8fa8d8a9662c7b9e67
record_format	dspace
spelling	oai:doaj.org-article:ab42b2d71b984b8fa8d8a9662c7b9e672021-11-08T15:52:40ZSeismic Improvement of Concrete Gravity Dam Strengthened by Asphalt Buttressing2476-39772538-261610.22065/jsce.2018.104564.1374https://doaj.org/article/ab42b2d71b984b8fa8d8a9662c7b9e672019-08-01T00:00:00Zhttps://www.jsce.ir/article_58418_4595bd039d41abba856f85f13f1e9d1f.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616In the present study, seismic analysis of concrete gravity dams strengthened by asphalt buttressing is presented for improving the seismic behavior of the Koyna dam in India subjected to Koyna ground motion. Fluid-Structure interaction is modeled including water compressibility and reservoir bottom absorption. The foundation is considered as rigid. A three-dimensional fixed smeared crack model is used to consider the nonlinear behavior of mass concrete. The analysis is carried out in the time domain by Newmark time integration scheme. Linear and nonlinear behavior of dam models subjected to horizontal and vertical components of selected record have been analysed. In order to investigate the effects of asphalt buttressing on the interface of dam and asphalt, the contact surface is defined using joint elements with a thickness of zero. The results of the analyzes confirm that the asphalt buttressing can improve the stability of the dam due to the pressure applied to the dam in counteracting the hydrostatic and hydrodynamic forces, Also the significant effect of asphalt Buttressing on the optimal distribution of stresses in the entire body of the dam as well as the prevention of stress concentration and reduction of fracture in the upper body near the dam crest show so that the crack at the lower section of the dam and at the interface of the dam and foundation is partially developed with a slower rate, and the cracking at the upper part near the crown of the dam does not spread to the upstream body of the dam and does not cause a total failure. Overall, it can be said that asphalt buttressing can improve the seismic stability of gravity dams by exerting pressure on the dam in opposition to hydrostatic and hydrodynamic loads.Amir PiroozniaAmir javad MoradlooIranian Society of Structrual Engineering (ISSE)articleasphalt buttressingconcrete gravity damnonlinear analysisseismic rehabilitationsmeared crackBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 6, Iss شماره ویژه 2, Pp 127-148 (2019)
institution	DOAJ
collection	DOAJ
language	FA
topic	asphalt buttressing concrete gravity dam nonlinear analysis seismic rehabilitation smeared crack Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	asphalt buttressing concrete gravity dam nonlinear analysis seismic rehabilitation smeared crack Bridge engineering TG1-470 Building construction TH1-9745 Amir Pirooznia Amir javad Moradloo Seismic Improvement of Concrete Gravity Dam Strengthened by Asphalt Buttressing
description	In the present study, seismic analysis of concrete gravity dams strengthened by asphalt buttressing is presented for improving the seismic behavior of the Koyna dam in India subjected to Koyna ground motion. Fluid-Structure interaction is modeled including water compressibility and reservoir bottom absorption. The foundation is considered as rigid. A three-dimensional fixed smeared crack model is used to consider the nonlinear behavior of mass concrete. The analysis is carried out in the time domain by Newmark time integration scheme. Linear and nonlinear behavior of dam models subjected to horizontal and vertical components of selected record have been analysed. In order to investigate the effects of asphalt buttressing on the interface of dam and asphalt, the contact surface is defined using joint elements with a thickness of zero. The results of the analyzes confirm that the asphalt buttressing can improve the stability of the dam due to the pressure applied to the dam in counteracting the hydrostatic and hydrodynamic forces, Also the significant effect of asphalt Buttressing on the optimal distribution of stresses in the entire body of the dam as well as the prevention of stress concentration and reduction of fracture in the upper body near the dam crest show so that the crack at the lower section of the dam and at the interface of the dam and foundation is partially developed with a slower rate, and the cracking at the upper part near the crown of the dam does not spread to the upstream body of the dam and does not cause a total failure. Overall, it can be said that asphalt buttressing can improve the seismic stability of gravity dams by exerting pressure on the dam in opposition to hydrostatic and hydrodynamic loads.
format	article
author	Amir Pirooznia Amir javad Moradloo
author_facet	Amir Pirooznia Amir javad Moradloo
author_sort	Amir Pirooznia
title	Seismic Improvement of Concrete Gravity Dam Strengthened by Asphalt Buttressing
title_short	Seismic Improvement of Concrete Gravity Dam Strengthened by Asphalt Buttressing
title_full	Seismic Improvement of Concrete Gravity Dam Strengthened by Asphalt Buttressing
title_fullStr	Seismic Improvement of Concrete Gravity Dam Strengthened by Asphalt Buttressing
title_full_unstemmed	Seismic Improvement of Concrete Gravity Dam Strengthened by Asphalt Buttressing
title_sort	seismic improvement of concrete gravity dam strengthened by asphalt buttressing
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2019
url	https://doaj.org/article/ab42b2d71b984b8fa8d8a9662c7b9e67
work_keys_str_mv	AT amirpirooznia seismicimprovementofconcretegravitydamstrengthenedbyasphaltbuttressing AT amirjavadmoradloo seismicimprovementofconcretegravitydamstrengthenedbyasphaltbuttressing
_version_	1718441692786327552

Seismic Improvement of Concrete Gravity Dam Strengthened by Asphalt Buttressing

Ejemplares similares