Effects of beetle attack on the bending and compression strength properties of pine wood
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://repositorio.lnec.pt:8080/jspui/handle/123456789/1005382 |
Resumo: | One major difficulty one has to face in the assessment of old timber structures concerns the assessment of the effective strength of timber cross sections with biological damage. Its effects may generally be considered, either by assuming a reduced cross section or by assuming reduced mechanical properties for the apparent cross section. Where beetles attack produce a “diffuse” damage, i.e. their tunnels spread in most of the cross section surrounded by a significant amount of undamaged wood, the assumption of a reduced cross section may not be the best approach. To assess the effect of diffuse damage by beetles to pine timber, damaged timber was collected from an old structure and tested in bending and compression in small “clear” wood specimens(cross sections of 2cm x 2cm). The varied degrees of biological damage were assessed in terms of the “holes” area measured in the cross section surface with the help of image processing analysis. Bending and compression strength were correlated with biological damage. Test results suggest that, although very high levels of insect destruction have an impact on the timber strength, timber density still is the governing factor. |
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Effects of beetle attack on the bending and compression strength properties of pine woodTimber structuresMechanical propertiesBoring beetlesDamageDensityOne major difficulty one has to face in the assessment of old timber structures concerns the assessment of the effective strength of timber cross sections with biological damage. Its effects may generally be considered, either by assuming a reduced cross section or by assuming reduced mechanical properties for the apparent cross section. Where beetles attack produce a “diffuse” damage, i.e. their tunnels spread in most of the cross section surrounded by a significant amount of undamaged wood, the assumption of a reduced cross section may not be the best approach. To assess the effect of diffuse damage by beetles to pine timber, damaged timber was collected from an old structure and tested in bending and compression in small “clear” wood specimens(cross sections of 2cm x 2cm). The varied degrees of biological damage were assessed in terms of the “holes” area measured in the cross section surface with the help of image processing analysis. Bending and compression strength were correlated with biological damage. Test results suggest that, although very high levels of insect destruction have an impact on the timber strength, timber density still is the governing factor.2013-11-04T15:43:30Z2014-10-09T14:55:30Z2017-04-13T12:11:58Z2013-09-01T00:00:00Z2013-09conference objectinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1005382engCruz, H.Saporiti Machado, J.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-09-28T03:06:20Zoai:localhost:123456789/1005382Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-09-28T03:06:20Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Effects of beetle attack on the bending and compression strength properties of pine wood |
title |
Effects of beetle attack on the bending and compression strength properties of pine wood |
spellingShingle |
Effects of beetle attack on the bending and compression strength properties of pine wood Cruz, H. Timber structures Mechanical properties Boring beetles Damage Density |
title_short |
Effects of beetle attack on the bending and compression strength properties of pine wood |
title_full |
Effects of beetle attack on the bending and compression strength properties of pine wood |
title_fullStr |
Effects of beetle attack on the bending and compression strength properties of pine wood |
title_full_unstemmed |
Effects of beetle attack on the bending and compression strength properties of pine wood |
title_sort |
Effects of beetle attack on the bending and compression strength properties of pine wood |
author |
Cruz, H. |
author_facet |
Cruz, H. Saporiti Machado, J. |
author_role |
author |
author2 |
Saporiti Machado, J. |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Cruz, H. Saporiti Machado, J. |
dc.subject.por.fl_str_mv |
Timber structures Mechanical properties Boring beetles Damage Density |
topic |
Timber structures Mechanical properties Boring beetles Damage Density |
description |
One major difficulty one has to face in the assessment of old timber structures concerns the assessment of the effective strength of timber cross sections with biological damage. Its effects may generally be considered, either by assuming a reduced cross section or by assuming reduced mechanical properties for the apparent cross section. Where beetles attack produce a “diffuse” damage, i.e. their tunnels spread in most of the cross section surrounded by a significant amount of undamaged wood, the assumption of a reduced cross section may not be the best approach. To assess the effect of diffuse damage by beetles to pine timber, damaged timber was collected from an old structure and tested in bending and compression in small “clear” wood specimens(cross sections of 2cm x 2cm). The varied degrees of biological damage were assessed in terms of the “holes” area measured in the cross section surface with the help of image processing analysis. Bending and compression strength were correlated with biological damage. Test results suggest that, although very high levels of insect destruction have an impact on the timber strength, timber density still is the governing factor. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-11-04T15:43:30Z 2013-09-01T00:00:00Z 2013-09 2014-10-09T14:55:30Z 2017-04-13T12:11:58Z |
dc.type.driver.fl_str_mv |
conference object |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1005382 |
url |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1005382 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
mluisa.alvim@gmail.com |
_version_ |
1817548549129240576 |