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Danielsson, Henrik
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Publications (9/9 displayed)
- 2024Impact of Acetylation on the Behaviour of Single-Dowel Timber Connections
- 2023Experimental Testing and Numerical Evaluation of the Strain-softening Behavior of Birch Using a Cross-validation Calibration Approach
- 2021Moisture-dependency of the fracture energy of woodcitations
- 2021Moisture-dependency of the fracture energy of wood : A comparison of unmodified and acetylated Scots pine and birchcitations
- 2020Fracture characteristics of acetylated young Scots pinecitations
- 2017Strength and stiffness of cross laminated timber at in-plane beam loading
- 2016Fracture analysis of perpendicular to grain loaded dowel-type connections using a 3D cohesive zone modelcitations
- 2014Fracture analysis of glued laminated timber beams with a hole using a 3D cohesive zone modelcitations
- 2013A three dimensional plasticity model for perpendicular to grain cohesive fracture in woodcitations
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article
Impact of Acetylation on the Behaviour of Single-Dowel Timber Connections
Abstract
This paper presents an experimental study where the mechanical behaviour of single-dowel timber connections made of acetylated Scots pine is compared with the behaviour of connections made from untreated Scots pine. The main aim was to evaluate the influence of the acetylation on the connection brittleness and also to compare the experimental results to the design provisions of the current European structural timber code, Eurocode 5 (EC5). The experiments included embedment tests and tests with connections loaded parallel and perpendicular to the grain, and, for the latter tests, applying different end and edge distances. The acetylated wood showed a 2% increase in density and a 31% increase in embedment strength compared to the untreated wood. For tests on connections loaded parallel to the grain, all specimens made from acetylated wood failed in a brittle manner, while the connections made from untreated wood and complying with minimum end distance of the EC5 design provisions failed due to embedment failure followed by splitting involving cracking along the grain. The connections made of acetylated wood showed a 13–15% higher capacity than the corresponding specimens made from untreated wood. Thus, to fully utilize the potential of the increased embedment strength parallel to the grain, it is concluded that reinforcement of the joint, e.g., by self-tapping screws or externally applied sheet reinforcement would be necessary if the minimum end distances of EC5 are applied. The current design provisions for loading perpendicular to the grain overestimated the capacities severely with predicted characteristic values being 20–50% higher than mean values from tests for the recommended minimum edge distances. Finally, it was found that the splitting capacity in loading perpendicular to the grain was 10–18% lower for the specimens made from acetylated wood compared to the untreated wood.