Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Plug shear failure in nailed timber connections: avoiding brittle and promoting ductile failures
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.ORCID iD: 0000-0002-5907-7788
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Mechanical timber connections can fail both in a brittle and a ductile manner depending on the joint layout. Plug shear failure in nailed timber connections is a brittle failure mode, which shall be avoided in timber structures. This failure mode occurs in nailed connections loaded in tension parallel to the grain, for instance in the lower chord of a timber truss. The failure mode is not described in the Swedish building code of today, but there is an informative annex in the upcoming Eurocode 5 concerning the subject. In the thesis, plug shear failure is studied and a new prediction model developed based on experimental work on nailed steel-to-timber connections. The experiments were short-term experiments and the effect of long-term conditions is not considered. The total amount of joints tested was 86, which together with results from other researchers formed the base for the prediction model. The stress state and the effect of fastener placement were analysed and showed that plug shear failure is initiated at the nail farthest from the free end of timber. Increased spacing between fasteners lessens the risk for plug shear failure to occur, especially the spacing perpendicular to the grain is important. The prediction model is based on structural mechanics and suggests that the plug shear resistance R = blfv, where b is the joint width, l the joint length and fv the shear strength of wood. The shear strength is determined through fv = KAs-0.25, where As = bl and K is a constant. Furthermore, an analysis based on fracture mechanics was performed showing the importance of the softening behaviour of the joint failure. The overall goal with the development of a prediction model is to avoid brittle failures and promote ductile failures. As a tool to promote ductile failures, a measure was developed to aid the designer in designing ductile and strong joints. Recommendations on nail spacing and overall design of the joint are finally given with the aim to avoid plug shear failure.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2004. , p. 70
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 2004:03
National Category
Building Technologies
Research subject
Timber Structures
Identifiers
URN: urn:nbn:se:ltu:diva-26019Local ID: c33617c0-6f5f-11db-962b-000ea68e967bOAI: oai:DiVA.org:ltu-26019DiVA, id: diva2:999178
Note
Godkänd; 2004; 20061030 (haneit)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-08-07Bibliographically approved

Open Access in DiVA

fulltext(3223 kB)154 downloads
File information
File name FULLTEXT01.pdfFile size 3223 kBChecksum SHA-512
4e77bb92c73ca1e110c8837951973f221c4f24ddb3738c65585b2d594c842552c2e546b64c99b93bfbf2ec5896b389be846535f988e98a5e1a92aa90c9bd10b3
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Johnsson, Helena
By organisation
Structural and Construction Engineering
Building Technologies

Search outside of DiVA

GoogleGoogle Scholar
Total: 154 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 643 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf