Quasi-non-linear fracture mechanics analysis of splitting failure in simply supported beams loaded perpendicular to grain by dowel joints |
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Authors: | Jørgen Lauritzen Jensen |
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Institution: | (1) Institute of Wood Technology, Akita Prefectural University, 11-1 Kaieizaka, Noshiro 016-0876, Japan |
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Abstract: | A quasi-non-linear fracture mechanics model based on beam on elastic foundation theory is applied for analysis of the splitting
failure of dowel joints loaded perpendicular to grain. Simply supported beams symmetrically loaded by two dowels are considered,
and the effects of edge distance, dowel spacing, and distance between dowels and supports are accounted for. The foundation
modulus used in the beam on elastic foundation model is chosen so that the perpendicular-to-grain tensile strength and fracture
energy properties of the wood are correctly represented. This ensures that a conventional stress analysis and failure criterion
lead to the same solution as the compliance method of fracture mechanics. A semiempirical efficiency factor is proposed to
account for the influence of the total beam depth, which does not enter the beam on elastic foundation model, but the effect
of which is evident from tests. It is shown that the so-called Van der Put/Leijten model, which recently has been adopted
in Eurocode 5, appears as a special case of the model presented. Tests on simply supported beams with a single dowel joint
at midspan are compared with the theoretical predictions. Various edge distances, beam depths, and spans were tested. |
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Keywords: | Dowel joints Perpendicular to grain Splitting Fracture mechanics Beam on elastic foundation |
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