Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas
Autor(a) principal: | |
---|---|
Data de Publicação: | 2022 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/17022 |
Resumo: | The present work aims to investigate, in laboratory, of structural concrete blocks submitted to high temperatures to contribute with relevant information for the design of structural masonry in a fire situation. Since Brazil still does not have a national standard for masonry design in a fire situation, a first study was carried out, applying international standards for the Brazilian context. However, this approach must be carried out with caution, as there are significant differences in materials and procedures in civil construction in each country. In the second study, knowing that the material present in the hollow concrete blocks has, due to its geometry and manufacturing process, intrinsic properties that differ from the wet cast concrete material, a methodology is developed to evaluate and obtain, in laboratory, of the mechanical resistance of concrete blocks under high temperatures in a more adequate way. Then, in a third study, the thermal and physical properties of dry vibrated concrete, consisting of different types of coarse aggregate (basalt, limestone, and gneiss) and three different strength classes of blocks (6, 12 and 24 MPa) are investigated; comparing and evaluating the similarities and differences with wet cast concrete. The particularities of dry concrete used in the manufacture of masonry blocks showed significant differences in some analyzes due to their peculiarities in terms of porosity, humidity, density, etc. Based on the methodology properly developed to evaluate hollow concrete blocks, a fourth study was carried out to evaluate the influence that the type of coarse aggregate and the resistance class of the blocks, after heating, exert on the residual mechanical strength. It was observed that the mechanical behavior of hollow concrete blocks differs, to a certain degree, from the residual mechanical behavior found in the literature for wet cast concrete. Hollow concrete blocks tend to maintain compressive strength from room temperature to higher temperatures, 300°C for siliceous aggregates and 400°C for limestone aggregates. With the parameters obtained in the previous phases of the study, which served as a starting point in the approach of thermal models, in the fifth study, it was possible to determine isotherms of the concrete blocks by numerical models calibrated from experimental results. In this way, a numerical approach to verify in a simplified way the resistance of concrete blocks in fire situation by analytical method is presented. The data and analyzes reported on methodology, residual thermal and mechanical properties of hollow concrete blocks produced from a concrete mixture of very dry consistency, vibro-pressed and with normal weight aggregates, are new and unprecedented to enable the understanding of the behavior of Brazilian blocks and guide future research. |
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Medeiros, Wallison AngelimParsekian, Guilherme Arishttp://lattes.cnpq.br/7798651726059215Moreno Junior, Armando Lopeshttp://lattes.cnpq.br/5004049383694261http://lattes.cnpq.br/5216412123239986d22b4607-afce-4b95-96e3-64f980a82f202022-11-11T11:55:25Z2022-11-11T11:55:25Z2022-10-24MEDEIROS, Wallison Angelim. Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas. 2022. Tese (Doutorado em Engenharia Civil) – Universidade Federal de São Carlos, São Carlos, 2022. Disponível em: https://repositorio.ufscar.br/handle/ufscar/17022.https://repositorio.ufscar.br/handle/ufscar/17022The present work aims to investigate, in laboratory, of structural concrete blocks submitted to high temperatures to contribute with relevant information for the design of structural masonry in a fire situation. Since Brazil still does not have a national standard for masonry design in a fire situation, a first study was carried out, applying international standards for the Brazilian context. However, this approach must be carried out with caution, as there are significant differences in materials and procedures in civil construction in each country. In the second study, knowing that the material present in the hollow concrete blocks has, due to its geometry and manufacturing process, intrinsic properties that differ from the wet cast concrete material, a methodology is developed to evaluate and obtain, in laboratory, of the mechanical resistance of concrete blocks under high temperatures in a more adequate way. Then, in a third study, the thermal and physical properties of dry vibrated concrete, consisting of different types of coarse aggregate (basalt, limestone, and gneiss) and three different strength classes of blocks (6, 12 and 24 MPa) are investigated; comparing and evaluating the similarities and differences with wet cast concrete. The particularities of dry concrete used in the manufacture of masonry blocks showed significant differences in some analyzes due to their peculiarities in terms of porosity, humidity, density, etc. Based on the methodology properly developed to evaluate hollow concrete blocks, a fourth study was carried out to evaluate the influence that the type of coarse aggregate and the resistance class of the blocks, after heating, exert on the residual mechanical strength. It was observed that the mechanical behavior of hollow concrete blocks differs, to a certain degree, from the residual mechanical behavior found in the literature for wet cast concrete. Hollow concrete blocks tend to maintain compressive strength from room temperature to higher temperatures, 300°C for siliceous aggregates and 400°C for limestone aggregates. With the parameters obtained in the previous phases of the study, which served as a starting point in the approach of thermal models, in the fifth study, it was possible to determine isotherms of the concrete blocks by numerical models calibrated from experimental results. In this way, a numerical approach to verify in a simplified way the resistance of concrete blocks in fire situation by analytical method is presented. The data and analyzes reported on methodology, residual thermal and mechanical properties of hollow concrete blocks produced from a concrete mixture of very dry consistency, vibro-pressed and with normal weight aggregates, are new and unprecedented to enable the understanding of the behavior of Brazilian blocks and guide future research.O presente trabalho tem como objetivo a avaliação, em laboratório, de blocos de concreto estruturais submetidos a altas temperaturas de forma a contribuir com relevantes informações para projeto de alvenaria estrutural em situação de incêndio. Uma vez que o Brasil ainda não possui norma nacional para projeto de alvenaria em situação de incêndio, foi realizado um primeiro estudo, aplicando normas internacionais para o contexto brasileiro. Entretanto, essa abordagem deve ser realizada com cautela, visto que existem diferenças significativas dos materiais e procedimentos na construção civil de cada país. No segundo estudo, sabendo que o material presente nos blocos de concreto vazados possui, devido sua geometria e processo de fabricação, propriedades intrínsecas que os diferem do material concreto moldado úmido, é desenvolvida, a partir de então, metodologia para avaliação e obtenção, em laboratório, da resistência mecânica de blocos de concreto sob elevadas temperaturas de forma mais adequada. Em seguida, em um terceiro estudo, as propriedades térmicas e físicas do concreto seco vibroprensado, constituído por diferentes tipos de agregado graúdo (basalto, calcário e gnaisse) e de três classe de resistência de blocos distintos (6, 12 e 24 MPa), são investigadas e analisadas; comparando e avaliando as semelhanças e diferenças com o concreto moldado úmido. As particularidades do concreto seco empregado na fabricação de blocos de alvenaria demonstraram em algumas análises diferenças significativas devidos suas peculiaridades quanto a porosidade, umidade, densidade etc. A partir da metodologia adequadamente desenvolvida para avaliar blocos de concreto vazado, foi realizado um quarto estudo para avaliar a influência que o tipo de agregado graúdo e a classe de resistência dos blocos, pós-aquecimento, exercem na resistência mecânica residual. Observou-se que o comportamento mecânico dos blocos vazados de concreto difere-se, em certo grau, do comportamento mecânico residual encontrado em literatura para o concreto moldado úmido. Blocos de concreto vazados, tendem a manter a resistência à compressão da temperatura ambiente até maiores temperaturas, 300°C para agregado silicosos e 400°C para agregado do tipo calcário. Com os parâmetros obtidos nas fases anteriores do estudo, que serviram como ponto de partida na abordagem de modelos térmicos, no quinto estudo, foi possível determinar isotermas dos blocos de concreto por modelos numéricos calibrados a partir de resultados experimentais. Desta forma, uma abordagem numérica para verificar de forma simplificada a resistência de blocos de concreto em situação de incêndio por método analítico é apresentada. Os dados e análises relatados sobre metodologia, propriedades térmicas e mecânicas residuais de blocos de concreto vazados produzidos a partir de uma mistura de concreto de consistência muito seca, vibro-prensados e com agregados de peso normal, são novos e inéditos de forma a possibilitar a compreensão do comportamento dos blocos brasileiros e orientar pesquisas futuras.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)2018/19748-9porUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Engenharia Civil - PPGECivUFSCarAttribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessElevadas temperaturasAlvenaria estruturalBlocos de concretoAnálise experimentalAbordagem numéricaHigh temperaturesStructural masonryConcrete blocksExperimental analysisNumerical analysisENGENHARIAS::ENGENHARIA CIVIL::ESTRUTURASComportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturasBehavior of structural concrete blocks with different aggregates under high temperaturesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis600600cc830dc1-debc-4e7f-bbc7-a442aa405614reponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALTese_MedeirosWA.pdfTese_MedeirosWA.pdfTeseapplication/pdf7525995https://repositorio.ufscar.br/bitstream/ufscar/17022/4/Tese_MedeirosWA.pdf67692c42614ac9171e07eb7d5a453409MD54Carta_Aprovacao_assinado.pdfCarta_Aprovacao_assinado.pdfCarta aprovaçãoapplication/pdf233755https://repositorio.ufscar.br/bitstream/ufscar/17022/2/Carta_Aprovacao_assinado.pdf70545f1df5e518bafcb5f493ae0de4e6MD52CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8811https://repositorio.ufscar.br/bitstream/ufscar/17022/5/license_rdfe39d27027a6cc9cb039ad269a5db8e34MD55TEXTTese_MedeirosWA.pdf.txtTese_MedeirosWA.pdf.txtExtracted texttext/plain481977https://repositorio.ufscar.br/bitstream/ufscar/17022/6/Tese_MedeirosWA.pdf.txtfe4ffee7e92640b33e2b87db352edfa7MD56Carta_Aprovacao_assinado.pdf.txtCarta_Aprovacao_assinado.pdf.txtExtracted texttext/plain1158https://repositorio.ufscar.br/bitstream/ufscar/17022/8/Carta_Aprovacao_assinado.pdf.txtd4e3904b250a1d978094b655c39ea98cMD58THUMBNAILTese_MedeirosWA.pdf.jpgTese_MedeirosWA.pdf.jpgIM Thumbnailimage/jpeg5554https://repositorio.ufscar.br/bitstream/ufscar/17022/7/Tese_MedeirosWA.pdf.jpgdc532d6990b24878517c882ab2f91279MD57Carta_Aprovacao_assinado.pdf.jpgCarta_Aprovacao_assinado.pdf.jpgIM Thumbnailimage/jpeg13447https://repositorio.ufscar.br/bitstream/ufscar/17022/9/Carta_Aprovacao_assinado.pdf.jpg2274a63b6224d105f7241dd881d745baMD59ufscar/170222023-09-18 18:32:25.785oai:repositorio.ufscar.br:ufscar/17022Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:32:25Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas |
dc.title.alternative.eng.fl_str_mv |
Behavior of structural concrete blocks with different aggregates under high temperatures |
title |
Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas |
spellingShingle |
Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas Medeiros, Wallison Angelim Elevadas temperaturas Alvenaria estrutural Blocos de concreto Análise experimental Abordagem numérica High temperatures Structural masonry Concrete blocks Experimental analysis Numerical analysis ENGENHARIAS::ENGENHARIA CIVIL::ESTRUTURAS |
title_short |
Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas |
title_full |
Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas |
title_fullStr |
Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas |
title_full_unstemmed |
Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas |
title_sort |
Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas |
author |
Medeiros, Wallison Angelim |
author_facet |
Medeiros, Wallison Angelim |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/5216412123239986 |
dc.contributor.author.fl_str_mv |
Medeiros, Wallison Angelim |
dc.contributor.advisor1.fl_str_mv |
Parsekian, Guilherme Aris |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/7798651726059215 |
dc.contributor.advisor-co1.fl_str_mv |
Moreno Junior, Armando Lopes |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/5004049383694261 |
dc.contributor.authorID.fl_str_mv |
d22b4607-afce-4b95-96e3-64f980a82f20 |
contributor_str_mv |
Parsekian, Guilherme Aris Moreno Junior, Armando Lopes |
dc.subject.por.fl_str_mv |
Elevadas temperaturas Alvenaria estrutural Blocos de concreto Análise experimental Abordagem numérica |
topic |
Elevadas temperaturas Alvenaria estrutural Blocos de concreto Análise experimental Abordagem numérica High temperatures Structural masonry Concrete blocks Experimental analysis Numerical analysis ENGENHARIAS::ENGENHARIA CIVIL::ESTRUTURAS |
dc.subject.eng.fl_str_mv |
High temperatures Structural masonry Concrete blocks Experimental analysis Numerical analysis |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA CIVIL::ESTRUTURAS |
description |
The present work aims to investigate, in laboratory, of structural concrete blocks submitted to high temperatures to contribute with relevant information for the design of structural masonry in a fire situation. Since Brazil still does not have a national standard for masonry design in a fire situation, a first study was carried out, applying international standards for the Brazilian context. However, this approach must be carried out with caution, as there are significant differences in materials and procedures in civil construction in each country. In the second study, knowing that the material present in the hollow concrete blocks has, due to its geometry and manufacturing process, intrinsic properties that differ from the wet cast concrete material, a methodology is developed to evaluate and obtain, in laboratory, of the mechanical resistance of concrete blocks under high temperatures in a more adequate way. Then, in a third study, the thermal and physical properties of dry vibrated concrete, consisting of different types of coarse aggregate (basalt, limestone, and gneiss) and three different strength classes of blocks (6, 12 and 24 MPa) are investigated; comparing and evaluating the similarities and differences with wet cast concrete. The particularities of dry concrete used in the manufacture of masonry blocks showed significant differences in some analyzes due to their peculiarities in terms of porosity, humidity, density, etc. Based on the methodology properly developed to evaluate hollow concrete blocks, a fourth study was carried out to evaluate the influence that the type of coarse aggregate and the resistance class of the blocks, after heating, exert on the residual mechanical strength. It was observed that the mechanical behavior of hollow concrete blocks differs, to a certain degree, from the residual mechanical behavior found in the literature for wet cast concrete. Hollow concrete blocks tend to maintain compressive strength from room temperature to higher temperatures, 300°C for siliceous aggregates and 400°C for limestone aggregates. With the parameters obtained in the previous phases of the study, which served as a starting point in the approach of thermal models, in the fifth study, it was possible to determine isotherms of the concrete blocks by numerical models calibrated from experimental results. In this way, a numerical approach to verify in a simplified way the resistance of concrete blocks in fire situation by analytical method is presented. The data and analyzes reported on methodology, residual thermal and mechanical properties of hollow concrete blocks produced from a concrete mixture of very dry consistency, vibro-pressed and with normal weight aggregates, are new and unprecedented to enable the understanding of the behavior of Brazilian blocks and guide future research. |
publishDate |
2022 |
dc.date.accessioned.fl_str_mv |
2022-11-11T11:55:25Z |
dc.date.available.fl_str_mv |
2022-11-11T11:55:25Z |
dc.date.issued.fl_str_mv |
2022-10-24 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
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doctoralThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
MEDEIROS, Wallison Angelim. Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas. 2022. Tese (Doutorado em Engenharia Civil) – Universidade Federal de São Carlos, São Carlos, 2022. Disponível em: https://repositorio.ufscar.br/handle/ufscar/17022. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/17022 |
identifier_str_mv |
MEDEIROS, Wallison Angelim. Comportamento de blocos estruturais de concreto com diferentes agregados sob altas temperaturas. 2022. Tese (Doutorado em Engenharia Civil) – Universidade Federal de São Carlos, São Carlos, 2022. Disponível em: https://repositorio.ufscar.br/handle/ufscar/17022. |
url |
https://repositorio.ufscar.br/handle/ufscar/17022 |
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por |
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600 600 |
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cc830dc1-debc-4e7f-bbc7-a442aa405614 |
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Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ |
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openAccess |
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Universidade Federal de São Carlos Câmpus São Carlos |
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Programa de Pós-Graduação em Engenharia Civil - PPGECiv |
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UFSCar |
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Universidade Federal de São Carlos Câmpus São Carlos |
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