Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trusses
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.4025/actascitechnol.v45i1.58733 http://hdl.handle.net/11449/240729 |
Resumo: | The Brazilian standard ABNT NBR 7190 (Associação Brasileira de Normas Técnicas [ABNT], 1997) recommends adopting the mean value of the modulus of elasticity to compression in the direction parallel to the grain (Ec0,m) in the calculation of displacements. The values of wood stiffness vary considerably, and they can generate displacements above the limit (L 200-1, where L is the span) established by the referred standard, which contributes to the appearance of pathologies in the structure. To evaluate the influence of the adoption of Ec0,m in the calculation of displacements, mechanical properties of wood species were obtained experimentally. With the aid of numerical models and experimental values, ten types of trusses were analyzed (Porch, Inclined Chord, Top Inclined Chord, Parallel Chord, Bowstring, Fink, Howe, K Truss, Pratt, Scissor), three spans (5, 10, and 20 m) and two species (Hymenolobium petraum Ducke e Hymenolobium sp). Initially, adopting Ec0,m for all members and performing a linear analysis, the maximum loads for the displacement L 200-1 were determined. Subsequently, experimental stiffness values were randomly assigned to each bar, and the maximum displacements were determined through nonlinear geometric analyses. Based on 1260 numerical simulations, deflections of approximately 17% (span of 5 m), 30% (span of 10 m), and 34% (span of 20 m) were observed to be higher than the result considering Ec0,m. This problem can be overcome by using non-destructive methods in the pre-classification of the structure bars, positioning the elements rationally in the regions of the highest demand. |
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Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trussesdicotyledonsfinite element methodmechanical and physical propertiesThe Brazilian standard ABNT NBR 7190 (Associação Brasileira de Normas Técnicas [ABNT], 1997) recommends adopting the mean value of the modulus of elasticity to compression in the direction parallel to the grain (Ec0,m) in the calculation of displacements. The values of wood stiffness vary considerably, and they can generate displacements above the limit (L 200-1, where L is the span) established by the referred standard, which contributes to the appearance of pathologies in the structure. To evaluate the influence of the adoption of Ec0,m in the calculation of displacements, mechanical properties of wood species were obtained experimentally. With the aid of numerical models and experimental values, ten types of trusses were analyzed (Porch, Inclined Chord, Top Inclined Chord, Parallel Chord, Bowstring, Fink, Howe, K Truss, Pratt, Scissor), three spans (5, 10, and 20 m) and two species (Hymenolobium petraum Ducke e Hymenolobium sp). Initially, adopting Ec0,m for all members and performing a linear analysis, the maximum loads for the displacement L 200-1 were determined. Subsequently, experimental stiffness values were randomly assigned to each bar, and the maximum displacements were determined through nonlinear geometric analyses. Based on 1260 numerical simulations, deflections of approximately 17% (span of 5 m), 30% (span of 10 m), and 34% (span of 20 m) were observed to be higher than the result considering Ec0,m. This problem can be overcome by using non-destructive methods in the pre-classification of the structure bars, positioning the elements rationally in the regions of the highest demand.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Departamento de Engenharia Civil Universidade Federal de São Carlos, Rodovia Washington Luiz, s/n., São PauloDepartamento de Engenharia Industrial da Madeira Universidade Estadual Paulista, São PauloDepartamento de Engenharia Civil Centro de Inovação e Competência Florestal Universidade de CoimbraLaboratório de Estruturas de Madeira Departamento de Engenharia de Estruturas Escola de Engenharia de São Carlos Universidade de São Paulo, São PauloDepartamento de Engenharia Industrial da Madeira Universidade Estadual Paulista, São PauloUniversidade Federal de São Carlos (UFSCar)Universidade Estadual Paulista (UNESP)Universidade de CoimbraUniversidade de São Paulo (USP)Gomes, Arthur Filipe FreireAlmeida Filho, Fernando Menezes deMolina, Júlio Cesar [UNESP]Mascarenhas, Fernando Júnior ResendeLahr, Francisco Antônio RoccoChristoforo, André Luis2023-03-01T20:30:21Z2023-03-01T20:30:21Z2022-08-26info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.4025/actascitechnol.v45i1.58733Acta Scientiarum - Technology, v. 45, n. 1, 2022.1807-86641806-2563http://hdl.handle.net/11449/24072910.4025/actascitechnol.v45i1.587332-s2.0-85136966527Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengActa Scientiarum - Technologyinfo:eu-repo/semantics/openAccess2023-03-01T20:30:22Zoai:repositorio.unesp.br:11449/240729Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:28:33.196249Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trusses |
title |
Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trusses |
spellingShingle |
Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trusses Gomes, Arthur Filipe Freire dicotyledons finite element method mechanical and physical properties |
title_short |
Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trusses |
title_full |
Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trusses |
title_fullStr |
Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trusses |
title_full_unstemmed |
Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trusses |
title_sort |
Influence of mean value of the modulus of elasticity in compression parallel to the grain on the design of timber trusses |
author |
Gomes, Arthur Filipe Freire |
author_facet |
Gomes, Arthur Filipe Freire Almeida Filho, Fernando Menezes de Molina, Júlio Cesar [UNESP] Mascarenhas, Fernando Júnior Resende Lahr, Francisco Antônio Rocco Christoforo, André Luis |
author_role |
author |
author2 |
Almeida Filho, Fernando Menezes de Molina, Júlio Cesar [UNESP] Mascarenhas, Fernando Júnior Resende Lahr, Francisco Antônio Rocco Christoforo, André Luis |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de São Carlos (UFSCar) Universidade Estadual Paulista (UNESP) Universidade de Coimbra Universidade de São Paulo (USP) |
dc.contributor.author.fl_str_mv |
Gomes, Arthur Filipe Freire Almeida Filho, Fernando Menezes de Molina, Júlio Cesar [UNESP] Mascarenhas, Fernando Júnior Resende Lahr, Francisco Antônio Rocco Christoforo, André Luis |
dc.subject.por.fl_str_mv |
dicotyledons finite element method mechanical and physical properties |
topic |
dicotyledons finite element method mechanical and physical properties |
description |
The Brazilian standard ABNT NBR 7190 (Associação Brasileira de Normas Técnicas [ABNT], 1997) recommends adopting the mean value of the modulus of elasticity to compression in the direction parallel to the grain (Ec0,m) in the calculation of displacements. The values of wood stiffness vary considerably, and they can generate displacements above the limit (L 200-1, where L is the span) established by the referred standard, which contributes to the appearance of pathologies in the structure. To evaluate the influence of the adoption of Ec0,m in the calculation of displacements, mechanical properties of wood species were obtained experimentally. With the aid of numerical models and experimental values, ten types of trusses were analyzed (Porch, Inclined Chord, Top Inclined Chord, Parallel Chord, Bowstring, Fink, Howe, K Truss, Pratt, Scissor), three spans (5, 10, and 20 m) and two species (Hymenolobium petraum Ducke e Hymenolobium sp). Initially, adopting Ec0,m for all members and performing a linear analysis, the maximum loads for the displacement L 200-1 were determined. Subsequently, experimental stiffness values were randomly assigned to each bar, and the maximum displacements were determined through nonlinear geometric analyses. Based on 1260 numerical simulations, deflections of approximately 17% (span of 5 m), 30% (span of 10 m), and 34% (span of 20 m) were observed to be higher than the result considering Ec0,m. This problem can be overcome by using non-destructive methods in the pre-classification of the structure bars, positioning the elements rationally in the regions of the highest demand. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-08-26 2023-03-01T20:30:21Z 2023-03-01T20:30:21Z |
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.uri.fl_str_mv |
http://dx.doi.org/10.4025/actascitechnol.v45i1.58733 Acta Scientiarum - Technology, v. 45, n. 1, 2022. 1807-8664 1806-2563 http://hdl.handle.net/11449/240729 10.4025/actascitechnol.v45i1.58733 2-s2.0-85136966527 |
url |
http://dx.doi.org/10.4025/actascitechnol.v45i1.58733 http://hdl.handle.net/11449/240729 |
identifier_str_mv |
Acta Scientiarum - Technology, v. 45, n. 1, 2022. 1807-8664 1806-2563 10.4025/actascitechnol.v45i1.58733 2-s2.0-85136966527 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Acta Scientiarum - Technology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1808129072906108928 |