Prediction of the load carrying capacity of bolted timber joints |
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Authors: | L Daudeville L Davenne M Yasumura |
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Institution: | (1) Laboratoire de Mécanique et Technologie, ENS Cachan/CNRS/Université Paris 6, 61 avenue du Président Wilson, 94235 Cachan, France email: Laurent.Daudeville@lmt.ens-cachan.fr, FR;(2) Department of Forest Resources Science, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka 422, Japan, JP |
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Abstract: | Failure of bolted timber joints is analyzed experimentally and numerically. In this study, the prediction of the load-carrying
capacity of dowel-type joints with one dowel under static loading is based on the analysis of fracture in wood contrarily
to most engineering methods that are based on the yield theory. Mechanical joints consist of glued laminated spruce members
and steel dowels. In the different analyzed tests, the bolt loads the wood parallel or perpendicular to the grain. The wood
member thickness is chosen sufficiently thin to avoid the fastener from presenting plastic hinges. The influences of different
structural parameters such as the dowel diameter, the edge- and end-distances are investigated. The fracture propagation analysis
is carried out with the Finite Element (FE) method in the framework of Linear Elastic Fracture Mechanics (LEFM). The only
identified parameter is the critical energy release rate in mode I (GIc). The comparison between experimental and numerical results shows that the fracture must be considered for a correct prediction
of the ultimate load and that LEFM can help to improve design codes.
Received 11 August 1997 |
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