Impact of Acetylation on the Behaviour of Single-Dowel Timber Connections
Forsman, Karin LU ; Serrano, Erik LU
and Danielsson, Henrik
LU
(2024)
In Buildings
14(2).
- 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... (More)
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.
(Less)
- author
- Forsman, Karin
LU
; Serrano, Erik
LU
and Danielsson, Henrik
LU
- organization
- publishing date
- 2024-02
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- acetylated wood, brittle failure, dowel-type connections, Scots pine, splitting, wood fracture
- in
- Buildings
- volume
- 14
- issue
- 2
- article number
- 405
- publisher
- MDPI AG
- external identifiers
-
- scopus:85185722138
- ISSN
- 2075-5309
- DOI
- 10.3390/buildings14020405
- language
- English
- LU publication?
- yes
- id
- aa572d6e-1d92-41a0-a644-98bbaa7a916c
- date added to LUP
- 2024-03-25 14:00:03
- date last changed
- 2024-03-25 14:01:24
@article{aa572d6e-1d92-41a0-a644-98bbaa7a916c,
abstract = {{<p>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.</p>}},
author = {{Forsman, Karin and Serrano, Erik and Danielsson, Henrik}},
issn = {{2075-5309}},
keywords = {{acetylated wood; brittle failure; dowel-type connections; Scots pine; splitting; wood fracture}},
language = {{eng}},
number = {{2}},
publisher = {{MDPI AG}},
series = {{Buildings}},
title = {{Impact of Acetylation on the Behaviour of Single-Dowel Timber Connections}},
url = {{http://dx.doi.org/10.3390/buildings14020405}},
doi = {{10.3390/buildings14020405}},
volume = {{14}},
year = {{2024}},
}