Creep strains on reinforced concrete columns
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/handle/123456789/30442 |
Resumo: | A concrete element when kept under sustained load presents progressive strain over time, associated to the creep. In reinforced concrete columns, such deformations cause the stress increase in the steel bars of the reinforcement and may induce the material to undergo the yielding phenomenon. The pioneering formulations about the creep effect, developed on the base of creep coefficient, are applicable, especially, when the stress magnitude remains constant. Its application to reinforced concrete members, which exhibits change in stress magnitude, requires simplifications of which result the memory models, which have the disadvantage of requiring the storage of the stress history. To overcome the difficulties related to the excessive demand for computer memory, State models have been developed that dispense such robustness of storage. The subject of this work is the analysis of creep deformations in reinforced concrete columns on the base of a state model fixing its physical parameters from results obtained through the NBR 6118/07 formulation. The results showed that, in the elapse of the phenomenon, occurs stresses transfer from the concrete mass to the reinforcement steel bars which, in turn, have the effect of restrain the creep strains, confirming, in some cases, an imminent material yielding condition |
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Madureira, Edmilson LiraSiqueira, T. MRodrigues, E. C2020-10-16T20:37:27Z2020-10-16T20:37:27Z2013MADUREIRA, E. L.; SIQUEIRA, T. M.; RODRIGUES, E. C.. Creep strains on reinforced concrete columns. Revista IBRACON de Estruturas e Materiais, v. 6, p. 537-560, 2013. Disponível em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952013000400003&lng=en&tlng=en. Acesso em: 06 out. 2020. http://dx.doi.org/10.1590/S1983-419520130004000031983-4195https://repositorio.ufrn.br/handle/123456789/3044210.1590/S1983-41952013000400003A concrete element when kept under sustained load presents progressive strain over time, associated to the creep. In reinforced concrete columns, such deformations cause the stress increase in the steel bars of the reinforcement and may induce the material to undergo the yielding phenomenon. The pioneering formulations about the creep effect, developed on the base of creep coefficient, are applicable, especially, when the stress magnitude remains constant. Its application to reinforced concrete members, which exhibits change in stress magnitude, requires simplifications of which result the memory models, which have the disadvantage of requiring the storage of the stress history. To overcome the difficulties related to the excessive demand for computer memory, State models have been developed that dispense such robustness of storage. The subject of this work is the analysis of creep deformations in reinforced concrete columns on the base of a state model fixing its physical parameters from results obtained through the NBR 6118/07 formulation. The results showed that, in the elapse of the phenomenon, occurs stresses transfer from the concrete mass to the reinforcement steel bars which, in turn, have the effect of restrain the creep strains, confirming, in some cases, an imminent material yielding conditionUm elemento de concreto quando mantido sob tensão apresenta deformação progressiva no decorrer do tempo, aditiva à deformação imediata ao carregamento. Em pilares de concreto armado, as deformações por fluência promovem o acréscimo de tensões nas barras de aço, podendo induzir o material a experimentar o escoamento. As formulações pioneiras do efeito de fluência, desenvolvidas com base no coeficiente de fluência, são aplicáveis, sobretudo, quando as tensões se mantêm constantes. Sua aplicação a elementos de concreto armado, que apresentam variações de tensões, requer simplificações das quais resultam os modelos de memória, que têm a desvantagem de exigir o armazenamento do histórico de tensões. Para suplantar as dificuldades ligadas à excessiva demanda de memória de computador, foram desenvolvidos os modelos de estado que dispensam tal robustez de armazenamento. O objetivo deste trabalho é a análise das deformações por fluência em pilares de concreto armado, realizada com base em um modelo de estado, com parâmetros fixados a partir da formulação da NBR 6118/07. Os resultados obtidos revelaram que, no decorrer do fenômeno, verifica-se a transferência de esforços do concreto para as barras da armadura de aço, que por sua vez exercem o efeito de contenção das deformações correlatas, confirmando-se, em alguns casos, o estabelecimento de uma condição de iminente escoamento do materialRevista IBRACON de Estruturas e MateriaisAttribution 3.0 Brazilhttp://creativecommons.org/licenses/by/3.0/br/info:eu-repo/semantics/openAccessReinforced concreteColumnCreepSimulationConcreto armadoPilarFluênciaSimulaçãoCreep strains on reinforced concrete columnsDeformações por fluência em pilares de concreto armadoinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleengreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNORIGINALCreepStrainsOnReinforced_Madureira_2013.pdfCreepStrainsOnReinforced_Madureira_2013.pdfapplication/pdf1379761https://repositorio.ufrn.br/bitstream/123456789/30442/1/CreepStrainsOnReinforced_Madureira_2013.pdfd2be20c6a72a812ebff85f80241cfbf3MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8914https://repositorio.ufrn.br/bitstream/123456789/30442/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/30442/3/license.txte9597aa2854d128fd968be5edc8a28d9MD53TEXTCreepStrainsOnReinforced_Madureira_2013.pdf.txtCreepStrainsOnReinforced_Madureira_2013.pdf.txtExtracted texttext/plain32914https://repositorio.ufrn.br/bitstream/123456789/30442/4/CreepStrainsOnReinforced_Madureira_2013.pdf.txt7bc29be832f6172ada29a032dbcecd9bMD54THUMBNAILCreepStrainsOnReinforced_Madureira_2013.pdf.jpgCreepStrainsOnReinforced_Madureira_2013.pdf.jpgGenerated Thumbnailimage/jpeg1637https://repositorio.ufrn.br/bitstream/123456789/30442/5/CreepStrainsOnReinforced_Madureira_2013.pdf.jpg66d9da716ae1a575b95f253a4163fc13MD55123456789/304422020-10-18 04:54:02.405oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2020-10-18T07:54:02Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.pt_BR.fl_str_mv |
Creep strains on reinforced concrete columns |
dc.title.alternative.pt_BR.fl_str_mv |
Deformações por fluência em pilares de concreto armado |
title |
Creep strains on reinforced concrete columns |
spellingShingle |
Creep strains on reinforced concrete columns Madureira, Edmilson Lira Reinforced concrete Column Creep Simulation Concreto armado Pilar Fluência Simulação |
title_short |
Creep strains on reinforced concrete columns |
title_full |
Creep strains on reinforced concrete columns |
title_fullStr |
Creep strains on reinforced concrete columns |
title_full_unstemmed |
Creep strains on reinforced concrete columns |
title_sort |
Creep strains on reinforced concrete columns |
author |
Madureira, Edmilson Lira |
author_facet |
Madureira, Edmilson Lira Siqueira, T. M Rodrigues, E. C |
author_role |
author |
author2 |
Siqueira, T. M Rodrigues, E. C |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Madureira, Edmilson Lira Siqueira, T. M Rodrigues, E. C |
dc.subject.por.fl_str_mv |
Reinforced concrete Column Creep Simulation Concreto armado Pilar Fluência Simulação |
topic |
Reinforced concrete Column Creep Simulation Concreto armado Pilar Fluência Simulação |
description |
A concrete element when kept under sustained load presents progressive strain over time, associated to the creep. In reinforced concrete columns, such deformations cause the stress increase in the steel bars of the reinforcement and may induce the material to undergo the yielding phenomenon. The pioneering formulations about the creep effect, developed on the base of creep coefficient, are applicable, especially, when the stress magnitude remains constant. Its application to reinforced concrete members, which exhibits change in stress magnitude, requires simplifications of which result the memory models, which have the disadvantage of requiring the storage of the stress history. To overcome the difficulties related to the excessive demand for computer memory, State models have been developed that dispense such robustness of storage. The subject of this work is the analysis of creep deformations in reinforced concrete columns on the base of a state model fixing its physical parameters from results obtained through the NBR 6118/07 formulation. The results showed that, in the elapse of the phenomenon, occurs stresses transfer from the concrete mass to the reinforcement steel bars which, in turn, have the effect of restrain the creep strains, confirming, in some cases, an imminent material yielding condition |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013 |
dc.date.accessioned.fl_str_mv |
2020-10-16T20:37:27Z |
dc.date.available.fl_str_mv |
2020-10-16T20:37:27Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
MADUREIRA, E. L.; SIQUEIRA, T. M.; RODRIGUES, E. C.. Creep strains on reinforced concrete columns. Revista IBRACON de Estruturas e Materiais, v. 6, p. 537-560, 2013. Disponível em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952013000400003&lng=en&tlng=en. Acesso em: 06 out. 2020. http://dx.doi.org/10.1590/S1983-41952013000400003 |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/handle/123456789/30442 |
dc.identifier.issn.none.fl_str_mv |
1983-4195 |
dc.identifier.doi.none.fl_str_mv |
10.1590/S1983-41952013000400003 |
identifier_str_mv |
MADUREIRA, E. L.; SIQUEIRA, T. M.; RODRIGUES, E. C.. Creep strains on reinforced concrete columns. Revista IBRACON de Estruturas e Materiais, v. 6, p. 537-560, 2013. Disponível em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952013000400003&lng=en&tlng=en. Acesso em: 06 out. 2020. http://dx.doi.org/10.1590/S1983-41952013000400003 1983-4195 10.1590/S1983-41952013000400003 |
url |
https://repositorio.ufrn.br/handle/123456789/30442 |
dc.language.iso.fl_str_mv |
eng |
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eng |
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Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ info:eu-repo/semantics/openAccess |
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Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ |
eu_rights_str_mv |
openAccess |
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Revista IBRACON de Estruturas e Materiais |
publisher.none.fl_str_mv |
Revista IBRACON de Estruturas e Materiais |
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