Journal
WOOD MATERIAL SCIENCE & ENGINEERING
Volume 14, Issue 5, Pages 254-268Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17480272.2019.1635204
Keywords
Axially loaded self-tapping screws; soft; and hardwood; wood anatomy; thread-grain angle; predrilling; end-grain joints
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Funding
- Austrian Research Promotion Agency (FFG) [850748]
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The raising stock of hardwood and the increasing popularity to build with timber are strong drivers to use hardwood as structural material on a regular basis. Despite its outstanding mechanical properties, economic boundary conditions in producing structural hardwood products consequence, however, rather a niche application. Efficient fastener and joint solutions which are optimised for hardwood are one possible solution to increase the share of hardwood in structural applications. Within this contribution a new, innovative and for hardwood optimised screw is benchmarked with a commercial screw. The influence of wood anatomy, thread-grain angle and predrilling on the withdrawal strength of single screws are analysed. For groups of screws, the minimum edge-distance and spacing perpendicular to the grain are determined and various possibilities for end-grain joints investigated. A generic approach for predicting the withdrawal strength of axially loaded self-tapping screws inserted in structural timber or glued laminated timber products from either soft- or hardwood is presented. Models to account for the influence of density, thread-grain angle and predrilling are proposed and regulations for the geometric requirements and execution of groups of screws in end-grain joints discussed.
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