Comportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estrutural
Ano de defesa: | 2016 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
Centro de Tecnologia |
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Engenharia Civil
|
Departamento: |
Engenharia Civil
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/12024 |
Resumo: | The literature indicates that mortar strength has little influence on concrete masonry strength, suggesting that the fresh state properties of the mortar are more relevant than the properties of the hardened mortar, and this point of view is reflected on standards and codes. However, the failure mode of the masonry can be dramatically influenced by the properties of the hardened bedding mortar especially when using a mortar with low compressive strength. In such case, mortar crushing can be the masonry failure mode. This study evaluated the influence of bedding mortar on the failure modes of axially loaded masonry through three distinct approaches. The first approach was a visual analysis that used pictures from a high-definition camera to determine the rupture sequence of masonry prisms. The analysis used pictures from tests of four different prism assemblages. The prisms were two and three blocks high with stack-bond and running-bond configurations and constructed with three types of blocks: concrete blocks and hollow and solid walls ceramic blocks. Two mortar types with different strengths were used to assemble the prisms. The visual analysis indicated that mortar crushing happens and completely changes the masonry failure mode. The second approach evaluated the stress-strain behavior of small thickness axially loaded mortar samples with the objective of capturing changes in the mechanical properties of the mortar. The properties of interest were the Poisson’s ratio, volumetric strain, and strain increments. The evaluation demonstrated that crack propagation near failure results in changes on the mechanical properties of the mortar and that those changes can be used as a measure of the degradation of the mortar. The third approach was the development of a finite element model to represent the axially loaded mortar samples. The model used a phased analysis, which allowed the elastic modulus and Poisson’s ratio of the material to be changed during the loading sequence. The nonlinear model was able to capture the strain changes on the confined mortar. |
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2017-11-10T14:50:26Z2017-11-10T14:50:26Z2016-11-24http://repositorio.ufsm.br/handle/1/12024The literature indicates that mortar strength has little influence on concrete masonry strength, suggesting that the fresh state properties of the mortar are more relevant than the properties of the hardened mortar, and this point of view is reflected on standards and codes. However, the failure mode of the masonry can be dramatically influenced by the properties of the hardened bedding mortar especially when using a mortar with low compressive strength. In such case, mortar crushing can be the masonry failure mode. This study evaluated the influence of bedding mortar on the failure modes of axially loaded masonry through three distinct approaches. The first approach was a visual analysis that used pictures from a high-definition camera to determine the rupture sequence of masonry prisms. The analysis used pictures from tests of four different prism assemblages. The prisms were two and three blocks high with stack-bond and running-bond configurations and constructed with three types of blocks: concrete blocks and hollow and solid walls ceramic blocks. Two mortar types with different strengths were used to assemble the prisms. The visual analysis indicated that mortar crushing happens and completely changes the masonry failure mode. The second approach evaluated the stress-strain behavior of small thickness axially loaded mortar samples with the objective of capturing changes in the mechanical properties of the mortar. The properties of interest were the Poisson’s ratio, volumetric strain, and strain increments. The evaluation demonstrated that crack propagation near failure results in changes on the mechanical properties of the mortar and that those changes can be used as a measure of the degradation of the mortar. The third approach was the development of a finite element model to represent the axially loaded mortar samples. The model used a phased analysis, which allowed the elastic modulus and Poisson’s ratio of the material to be changed during the loading sequence. The nonlinear model was able to capture the strain changes on the confined mortar.É comum no meio técnico a ideia de que a resistência da argamassa de assentamento tem pouca influência sobre a resistência da alvenaria, devendo-se valorizar mais o desempenho da argamassa no estado fresco do que no endurecido. Essa forma de pensamento reflete-se, ainda, em alguns textos normativos que regem o projeto de edificações em alvenaria estrutural. No entanto, quando analisado também o modo de ruptura da alvenaria, percebe-se que as propriedades da argamassa no estado endurecido podem alterar completamente a dinâmica de propagação de dano na alvenaria, em especial quando a argamassa de assentamento é de baixa resistência e sujeita a sofrer o esmagamento quando carregada. Este estudo buscou avaliar como a argamassa de assentamento influencia o modo de ruptura da alvenaria estrutural através de três diferentes abordagens. A primeira foi a análise visual, através de sequências quadro a quadro, da ruptura de prismas comprimidos axialmente. Foram avaliadas diferentes geometrias de prismas, com duas ou três fiadas de altura, com ou sem juntas verticais; três tipos de blocos, cerâmicos de paredes vazadas, cerâmicos de paredes maciças e blocos de concreto; e argamassas de alta e baixa resistência. Observou-se nessa abordagem que a argamassa de assentamento pode sofrer esmagamento e alterar o modo de ruptura da alvenaria. A segunda abordagem adotada foi a de avaliar o comportamento tensão-deformação de corpos-de-prova de argamassa com pequena altura sujeitos à compressão confinada, buscando identificar alterações em propriedades como coeficiente de Poisson, variação volumétrica específica e incrementos de deformação. A análise desses resultados demonstrou que a propagação de trincas no material próximo a ruptura altera as propriedades mecânicas e pode ser usada como uma medida do avanço da degradação. Por fim, a terceira abordagem buscou viabilizar um modelo numérico em elementos finitos capaz de considerar a propagação de trinca através da variação do módulo de elasticidade e coeficiente de Poisson. O modelo incremental por fases foi capaz de reproduzir de maneira satisfatória o comportamento de corpos-de-prova de argamassa comprimidos.porUniversidade Federal de Santa MariaCentro de TecnologiaPrograma de Pós-Graduação em Engenharia CivilUFSMBrasilEngenharia CivilAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessModo de ruptura da alvenariaArgamassa de assentamentoEsmagamento da argamassaConfinamento das juntas de argamassaFailure mode of masonryMortar compressive strengthMortar crushingConfined jointsFinite element analysisCNPQ::ENGENHARIAS::ENGENHARIA CIVILComportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estruturalMechanical behavior and influence of bedding mortar on failure mode of structural masonryinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisMohamad, Gihadhttp://lattes.cnpq.br/5446970753192990Alvarenga, Rita de Cássia Silva Sant'Anahttp://lattes.cnpq.br/4567947347922597Correa, Marcio Roberto Silvahttp://lattes.cnpq.br/7780769246876333Rizzatti, Eduardohttp://lattes.cnpq.br/2907271596071103Kirchhof, Larissa Degliuominihttp://lattes.cnpq.br/5442321946917625http://lattes.cnpq.br/7511022637484145Lübeck, André300100000003600821281d4-7dc1-4c12-b084-2d4c1590347abb3198fe-a0ee-4ce7-92c7-b9a63722dce8273b85c8-95bc-490f-9a27-dda89fbb32cfe2e7527e-b3df-45b7-87b4-5a39f14e8bd32b0cba66-0a08-4e39-bc97-ca6d672d818b8360e324-1522-4550-8760-fddb662e80cfreponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALTES_PPGEC_2016_LUBECK_ANDRE.pdfTES_PPGEC_2016_LUBECK_ANDRE.pdfTese de Doutoradoapplication/pdf12995787http://repositorio.ufsm.br/bitstream/1/12024/1/TES_PPGEC_2016_LUBECK_ANDRE.pdfe81cf449db19c77b4a654bf512b8bb21MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8804http://repositorio.ufsm.br/bitstream/1/12024/2/license_rdfc1efe8e24d7281448e873be30ea326ffMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-816http://repositorio.ufsm.br/bitstream/1/12024/3/license.txt6eeec7985884eb94336b41cc5308bf0fMD53TEXTTES_PPGEC_2016_LUBECK_ANDRE.pdf.txtTES_PPGEC_2016_LUBECK_ANDRE.pdf.txtExtracted texttext/plain507473http://repositorio.ufsm.br/bitstream/1/12024/4/TES_PPGEC_2016_LUBECK_ANDRE.pdf.txt719644702bfc982875933a83d5f08064MD54THUMBNAILTES_PPGEC_2016_LUBECK_ANDRE.pdf.jpgTES_PPGEC_2016_LUBECK_ANDRE.pdf.jpgIM Thumbnailimage/jpeg4362http://repositorio.ufsm.br/bitstream/1/12024/5/TES_PPGEC_2016_LUBECK_ANDRE.pdf.jpg0a3c9d2980863ebc3e081095c8756233MD551/120242017-11-10 12:50:26.86oai:repositorio.ufsm.br:1/12024Q3JlYXRpdmUgQ29tbXVucw==Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2017-11-10T14:50:26Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Comportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estrutural |
dc.title.alternative.eng.fl_str_mv |
Mechanical behavior and influence of bedding mortar on failure mode of structural masonry |
title |
Comportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estrutural |
spellingShingle |
Comportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estrutural Lübeck, André Modo de ruptura da alvenaria Argamassa de assentamento Esmagamento da argamassa Confinamento das juntas de argamassa Failure mode of masonry Mortar compressive strength Mortar crushing Confined joints Finite element analysis CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
title_short |
Comportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estrutural |
title_full |
Comportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estrutural |
title_fullStr |
Comportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estrutural |
title_full_unstemmed |
Comportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estrutural |
title_sort |
Comportamento mecânico e influência da argamassa no modo de ruptura da alvenaria estrutural |
author |
Lübeck, André |
author_facet |
Lübeck, André |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Mohamad, Gihad |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/5446970753192990 |
dc.contributor.referee1.fl_str_mv |
Alvarenga, Rita de Cássia Silva Sant'Ana |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/4567947347922597 |
dc.contributor.referee2.fl_str_mv |
Correa, Marcio Roberto Silva |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/7780769246876333 |
dc.contributor.referee3.fl_str_mv |
Rizzatti, Eduardo |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/2907271596071103 |
dc.contributor.referee4.fl_str_mv |
Kirchhof, Larissa Degliuomini |
dc.contributor.referee4Lattes.fl_str_mv |
http://lattes.cnpq.br/5442321946917625 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/7511022637484145 |
dc.contributor.author.fl_str_mv |
Lübeck, André |
contributor_str_mv |
Mohamad, Gihad Alvarenga, Rita de Cássia Silva Sant'Ana Correa, Marcio Roberto Silva Rizzatti, Eduardo Kirchhof, Larissa Degliuomini |
dc.subject.por.fl_str_mv |
Modo de ruptura da alvenaria Argamassa de assentamento Esmagamento da argamassa Confinamento das juntas de argamassa |
topic |
Modo de ruptura da alvenaria Argamassa de assentamento Esmagamento da argamassa Confinamento das juntas de argamassa Failure mode of masonry Mortar compressive strength Mortar crushing Confined joints Finite element analysis CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
dc.subject.eng.fl_str_mv |
Failure mode of masonry Mortar compressive strength Mortar crushing Confined joints Finite element analysis |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
description |
The literature indicates that mortar strength has little influence on concrete masonry strength, suggesting that the fresh state properties of the mortar are more relevant than the properties of the hardened mortar, and this point of view is reflected on standards and codes. However, the failure mode of the masonry can be dramatically influenced by the properties of the hardened bedding mortar especially when using a mortar with low compressive strength. In such case, mortar crushing can be the masonry failure mode. This study evaluated the influence of bedding mortar on the failure modes of axially loaded masonry through three distinct approaches. The first approach was a visual analysis that used pictures from a high-definition camera to determine the rupture sequence of masonry prisms. The analysis used pictures from tests of four different prism assemblages. The prisms were two and three blocks high with stack-bond and running-bond configurations and constructed with three types of blocks: concrete blocks and hollow and solid walls ceramic blocks. Two mortar types with different strengths were used to assemble the prisms. The visual analysis indicated that mortar crushing happens and completely changes the masonry failure mode. The second approach evaluated the stress-strain behavior of small thickness axially loaded mortar samples with the objective of capturing changes in the mechanical properties of the mortar. The properties of interest were the Poisson’s ratio, volumetric strain, and strain increments. The evaluation demonstrated that crack propagation near failure results in changes on the mechanical properties of the mortar and that those changes can be used as a measure of the degradation of the mortar. The third approach was the development of a finite element model to represent the axially loaded mortar samples. The model used a phased analysis, which allowed the elastic modulus and Poisson’s ratio of the material to be changed during the loading sequence. The nonlinear model was able to capture the strain changes on the confined mortar. |
publishDate |
2016 |
dc.date.issued.fl_str_mv |
2016-11-24 |
dc.date.accessioned.fl_str_mv |
2017-11-10T14:50:26Z |
dc.date.available.fl_str_mv |
2017-11-10T14:50:26Z |
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 |
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http://repositorio.ufsm.br/handle/1/12024 |
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http://repositorio.ufsm.br/handle/1/12024 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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300100000003 |
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600 |
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Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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openAccess |
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Universidade Federal de Santa Maria Centro de Tecnologia |
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Programa de Pós-Graduação em Engenharia Civil |
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UFSM |
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Brasil |
dc.publisher.department.fl_str_mv |
Engenharia Civil |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Tecnologia |
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