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Plug shear failure in nailed timber connections: load distribution and failure initiation
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.ORCID iD: 0000-0002-5907-7788
2004 (English)In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 62, no 6, p. 455-464Article in journal (Refereed) Published
Abstract [en]

Brittle failures in mechanical timber joints should be avoided, because this often results in low capacity and brittle failure of the structure. Nailed joints experience three ultimate failure modes: embedding, splitting or plug stear failure. To avoid plug shear failure, short and wide joints are preferred, limiting the number of fasteners in line with the load and grain direction. Plug shear failure was examined in short-term experiments on nailed steel-to-timber joints in glulam loaded in tension parallel to the grain with five different joint geometries. The aim of the study was to examine if the fastener group layout can be adjusted to avoid plug shear failure and to gain an insight into the causes of failure initiation. Using spring models, it is shown that the load distribution creates pronounced stresses at the last nail in the joint, which probably initiates the plug shear failure. Test results are compared with prediction models found in the literature. It was found that fasteners placed in groups can be a successful way of reducing the risk of plug shear failure. The failure is probably initiated at the nail farthest from the free end, where tensile stresses perpendicular to grain occur.

Place, publisher, year, edition, pages
2004. Vol. 62, no 6, p. 455-464
National Category
Building Technologies
Research subject
Timber Structures
Identifiers
URN: urn:nbn:se:ltu:diva-13022DOI: 10.1007/s00107-004-0523-9ISI: 000226096400010Scopus ID: 2-s2.0-10844259881Local ID: c2d3e6c0-ad69-11db-905c-000ea68e967bOAI: oai:DiVA.org:ltu-13022DiVA, id: diva2:985973
Note
Validerad; 2004; 20070126 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-08-07Bibliographically approved

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Johnsson, HelenaStehn, Lars

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