Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/6729 |
Resumo: | Currently, the civil construction industry has presented some changes. This is due to the recent economic growth that Brazil had achieved. These changes increased the employment of precast concrete structures. The front of this, some studies about the precast concrete connections had been developed. This work objective was to study the shear stress transference mechanism, which appears in the beam-slab connection interface – the composite beams. It was tested three different roughness degrees of the slab shear pockets: naturally rough surface, intentionally rough surface and surface with shear-key. For this, push-out tests – double “L” – were carried out and they showed that the employment of surface setting retarder admixture (ARSP) achieves the roughness degree recommended by the NBR 9062 (ABNT, 2006) without significantly reduce the connection strength. Next, with the same model type, the influence of the percentage of steel across the joint above the strength connection was tested. Besides, another model type – three blocks – was carried out with the same aim. Through those tests, It was could ascertained that the increase of the percentage of steel across the joint provides a linear increase of the strength connection, in as much as, the minimum and maximum values were inspected. Furthermore, the double “L” tests allowed the proposition of two expressions to determine the strength shear connection. And, in a third moment, composite beams were carried out, the results indicated, for the roughness degree and percentage of steel across the joint tested, that the beam-slab connection presents a partial interaction degree, even as the connection degree. Ultimately, the similarity between the three different types of tests could be proved with the proposed expressions application in the tests results. |
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Araújo, Daniel de Limahttp://lattes.cnpq.br/8801080897723883Araújo, Daniel de LimaPrado, Ademir Aparecido doCarrazedo, Ricardohttp://lattes.cnpq.br/5687377904843889Borges, Vanessa Elizabeth dos Santos2017-01-16T10:44:21Z2012-08-21BORGES, V. E. S. Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface. 2013. 175 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2012.http://repositorio.bc.ufg.br/tede/handle/tede/6729Currently, the civil construction industry has presented some changes. This is due to the recent economic growth that Brazil had achieved. These changes increased the employment of precast concrete structures. The front of this, some studies about the precast concrete connections had been developed. This work objective was to study the shear stress transference mechanism, which appears in the beam-slab connection interface – the composite beams. It was tested three different roughness degrees of the slab shear pockets: naturally rough surface, intentionally rough surface and surface with shear-key. For this, push-out tests – double “L” – were carried out and they showed that the employment of surface setting retarder admixture (ARSP) achieves the roughness degree recommended by the NBR 9062 (ABNT, 2006) without significantly reduce the connection strength. Next, with the same model type, the influence of the percentage of steel across the joint above the strength connection was tested. Besides, another model type – three blocks – was carried out with the same aim. Through those tests, It was could ascertained that the increase of the percentage of steel across the joint provides a linear increase of the strength connection, in as much as, the minimum and maximum values were inspected. Furthermore, the double “L” tests allowed the proposition of two expressions to determine the strength shear connection. And, in a third moment, composite beams were carried out, the results indicated, for the roughness degree and percentage of steel across the joint tested, that the beam-slab connection presents a partial interaction degree, even as the connection degree. Ultimately, the similarity between the three different types of tests could be proved with the proposed expressions application in the tests results.A indústria da construção civil, no Brasil, tem passado por alterações nos últimos anos. Tal fenômeno deve-se ao atual crescimento econômico atingido pelo país. Como resultado dessas alterações, aumentou o emprego das estruturas pré-moldadas de concreto. Diante desse contexto, têm sido realizados estudos sobre ligações entre peças pré-moldadas. Este trabalho apresenta como objetivo o estudo dos mecanismos de transferência das tensões de cisalhamento que se formam na interface entre vigas e lajes pré-moldadas, as chamadas vigas compostas. Foram avaliados, por meio de ensaios de cisalhamento direto em modelos compostos por duas peças em formato de “L”, três diferentes níveis de rugosidade da interface entre as peças, quais sejam: superfície naturalmente rugosa, superfície intencionalmente rugosa e superfície com chaves de cisalhamento. Dessa avaliação da rugosidade, constatou-se ser possível garantir o nível mínimo de rugosidade estabelecido pela NBR 9062 (ABNT, 2006) com o emprego de um aditivo retardador de pega superficial (ARSP), não apresentando redução significativa na resistência da ligação. Posteriormente, foram realizados ensaios utilizando o mesmo modelo, nos quais foi avaliada a influência da taxa de armadura normal à interface, que variou de 0,19% a 1,2%, sobre a resistência ao cisalhamento da ligação. E, paralelamente a esses ensaios, modelos do tipo três blocos ligados por meio de nichos, também com presença de armadura normal à superfície de cisalhamento, com taxas de 0,5% a 1,2%, foram testados e comparados com os anteriores. Tais ensaios permitiram a constatação de que ao se aumentar o valor da taxa de armadura, aumenta-se linearmente a resistência ao cisalhamento da ligação, ressaltando-se a necessidade de verificação de um valor mínimo e um máximo. E, além disso, os ensaios do tipo duplo “L” permitiram a proposição de expressões para cálculo da resistência ao cisalhamento da ligação. Em um terceiro momento, ensaios em vigas compostas formadas por viga e laje pré-moldadas ligadas mediante nichos com superfícies tratadas com ARSP foram realizados. Esta etapa visava à confirmação da eficiência da ligação com nichos e conectores metálicos. Quanto aos ensaios das vigas compostas, estes mostraram que para o nível de rugosidade avaliada e as taxas de armadura adotadas o grau de interação entre as peças é parcial, assim como seu grau de conexão. No que diz respeito à forma de ruptura observada nas vigas compostas, assim como nos modelos de cisalhamento direto, pode-se sugerir que o tratamento da interface na região dos nichos não proporcionou rugosidade suficiente para que houvesse uma ligação mais resistente entre as peças. E, por fim, da aplicação das expressões aos resultados dos ensaios de três blocos e de vigas constatou-se que há representatividade entre os três tipos de ensaio realizados.Submitted by Erika Demachki (erikademachki@gmail.com) on 2017-01-12T16:21:16Z No. of bitstreams: 2 Dissertação - Vanessa Elizabeth dos Santos Borges - 2012.pdf: 14072419 bytes, checksum: a1a40d9889226694c5d95e512ec5a689 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-01-16T10:44:21Z (GMT) No. of bitstreams: 2 Dissertação - Vanessa Elizabeth dos Santos Borges - 2012.pdf: 14072419 bytes, checksum: a1a40d9889226694c5d95e512ec5a689 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2017-01-16T10:44:21Z (GMT). No. of bitstreams: 2 Dissertação - Vanessa Elizabeth dos Santos Borges - 2012.pdf: 14072419 bytes, checksum: a1a40d9889226694c5d95e512ec5a689 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2012-08-21Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESapplication/pdfporUniversidade Federal de GoiásPrograma de Pós-graduação em Geotecnia, Estruturas e Construção Civil (EEC)UFGBrasilEscola de Engenharia Civil - EEC (RG)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessVigas compostasLigação de cisalhamentoConcreto pré-moldadoRugosidadeComposite beamsPrecast concreteShear connectionRoughnessESTRUTURAS::MECANICA DAS ESTRUTURASVigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interfaceComposite beams with precast slab connected by pockets: strength interface analysisinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis6915322422128222104600600600600724087251626315585-22971529077907822172075167498588264571reponame:Repositório Institucional da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGLICENSElicense.txtlicense.txttext/plain; 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dc.title.por.fl_str_mv |
Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface |
dc.title.alternative.eng.fl_str_mv |
Composite beams with precast slab connected by pockets: strength interface analysis |
title |
Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface |
spellingShingle |
Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface Borges, Vanessa Elizabeth dos Santos Vigas compostas Ligação de cisalhamento Concreto pré-moldado Rugosidade Composite beams Precast concrete Shear connection Roughness ESTRUTURAS::MECANICA DAS ESTRUTURAS |
title_short |
Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface |
title_full |
Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface |
title_fullStr |
Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface |
title_full_unstemmed |
Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface |
title_sort |
Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface |
author |
Borges, Vanessa Elizabeth dos Santos |
author_facet |
Borges, Vanessa Elizabeth dos Santos |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Araújo, Daniel de Lima |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/8801080897723883 |
dc.contributor.referee1.fl_str_mv |
Araújo, Daniel de Lima |
dc.contributor.referee2.fl_str_mv |
Prado, Ademir Aparecido do |
dc.contributor.referee3.fl_str_mv |
Carrazedo, Ricardo |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/5687377904843889 |
dc.contributor.author.fl_str_mv |
Borges, Vanessa Elizabeth dos Santos |
contributor_str_mv |
Araújo, Daniel de Lima Araújo, Daniel de Lima Prado, Ademir Aparecido do Carrazedo, Ricardo |
dc.subject.por.fl_str_mv |
Vigas compostas Ligação de cisalhamento Concreto pré-moldado Rugosidade |
topic |
Vigas compostas Ligação de cisalhamento Concreto pré-moldado Rugosidade Composite beams Precast concrete Shear connection Roughness ESTRUTURAS::MECANICA DAS ESTRUTURAS |
dc.subject.eng.fl_str_mv |
Composite beams Precast concrete Shear connection Roughness |
dc.subject.cnpq.fl_str_mv |
ESTRUTURAS::MECANICA DAS ESTRUTURAS |
description |
Currently, the civil construction industry has presented some changes. This is due to the recent economic growth that Brazil had achieved. These changes increased the employment of precast concrete structures. The front of this, some studies about the precast concrete connections had been developed. This work objective was to study the shear stress transference mechanism, which appears in the beam-slab connection interface – the composite beams. It was tested three different roughness degrees of the slab shear pockets: naturally rough surface, intentionally rough surface and surface with shear-key. For this, push-out tests – double “L” – were carried out and they showed that the employment of surface setting retarder admixture (ARSP) achieves the roughness degree recommended by the NBR 9062 (ABNT, 2006) without significantly reduce the connection strength. Next, with the same model type, the influence of the percentage of steel across the joint above the strength connection was tested. Besides, another model type – three blocks – was carried out with the same aim. Through those tests, It was could ascertained that the increase of the percentage of steel across the joint provides a linear increase of the strength connection, in as much as, the minimum and maximum values were inspected. Furthermore, the double “L” tests allowed the proposition of two expressions to determine the strength shear connection. And, in a third moment, composite beams were carried out, the results indicated, for the roughness degree and percentage of steel across the joint tested, that the beam-slab connection presents a partial interaction degree, even as the connection degree. Ultimately, the similarity between the three different types of tests could be proved with the proposed expressions application in the tests results. |
publishDate |
2012 |
dc.date.issued.fl_str_mv |
2012-08-21 |
dc.date.accessioned.fl_str_mv |
2017-01-16T10:44:21Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
BORGES, V. E. S. Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface. 2013. 175 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2012. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/6729 |
identifier_str_mv |
BORGES, V. E. S. Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface. 2013. 175 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2012. |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/6729 |
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por |
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2075167498588264571 |
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http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
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http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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UFG |
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Brasil |
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Escola de Engenharia Civil - EEC (RG) |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
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