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Densified wood dowel reinforcement of timber perpendicular to the grain: a pilot study

Densified wood dowel reinforcement of timber perpendicular to the grain: a pilot study An investigation was carried out to examine the potential to utilise densified wood dowels as a reinforcement for timber subjected to compression loading perpendicular to the grain. While timber has a high strength-to-weight ratio parallel to the grain, it demonstrates poor strength perpendicular to the grain and in recent years there has been a significant number of studies examining the use of steel screws and bonded-in rods as reinforcement in this area. This is becoming more and more important with the increased use of timber in medium-to-high rise structures. In this study, thermo-mechanical densified wood in the form of dowels are utilised as compression reinforcement perpendicular to the grain and tested to failure. Thermo-mechanically densified dowel reinforcement arrangements of 2, 4, and 6 dowels are examined experimentally under a compressive load and compared to timber samples similarly reinforced but with steel self-tapping screws. The results have demonstrated the potential to utilised densified wood to create an all-wood solution to reinforce against compressive stresses perpendicular to the grain. Additionally, modifications to recently proposed Eurocode 5 recommendations for the design of compression reinforcement using self-tapping steel screws are presented, which are suitable for the design of compression reinforcement using densified wood dowels. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Structural Integrity and Maintenance Taylor & Francis

Densified wood dowel reinforcement of timber perpendicular to the grain: a pilot study

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Densified wood dowel reinforcement of timber perpendicular to the grain: a pilot study

Abstract

An investigation was carried out to examine the potential to utilise densified wood dowels as a reinforcement for timber subjected to compression loading perpendicular to the grain. While timber has a high strength-to-weight ratio parallel to the grain, it demonstrates poor strength perpendicular to the grain and in recent years there has been a significant number of studies examining the use of steel screws and bonded-in rods as reinforcement in this area. This is becoming more and more...
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Publisher
Taylor & Francis
Copyright
© 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
ISSN
2470-5322
eISSN
2470-5314
DOI
10.1080/24705314.2021.1906090
Publisher site
See Article on Publisher Site

Abstract

An investigation was carried out to examine the potential to utilise densified wood dowels as a reinforcement for timber subjected to compression loading perpendicular to the grain. While timber has a high strength-to-weight ratio parallel to the grain, it demonstrates poor strength perpendicular to the grain and in recent years there has been a significant number of studies examining the use of steel screws and bonded-in rods as reinforcement in this area. This is becoming more and more important with the increased use of timber in medium-to-high rise structures. In this study, thermo-mechanical densified wood in the form of dowels are utilised as compression reinforcement perpendicular to the grain and tested to failure. Thermo-mechanically densified dowel reinforcement arrangements of 2, 4, and 6 dowels are examined experimentally under a compressive load and compared to timber samples similarly reinforced but with steel self-tapping screws. The results have demonstrated the potential to utilised densified wood to create an all-wood solution to reinforce against compressive stresses perpendicular to the grain. Additionally, modifications to recently proposed Eurocode 5 recommendations for the design of compression reinforcement using self-tapping steel screws are presented, which are suitable for the design of compression reinforcement using densified wood dowels.

Journal

Journal of Structural Integrity and Maintenance – Taylor & Francis

Published: Jul 3, 2021

Keywords: Compressed wood; densified wood; reinforcement; glued laminated timber; stresses perpendicular to grain; Eurocode 5; self-tapping screws

References

  • Herstellung und Eigenschaften von großformattgen Platten aus verdichtetem Frichten-und Tannenholz: Teil 1: Plattenherstellung
  • Herstellung und Eigenschaften von großformattgen Platten aus verdichtetem Frichten-und Tannenholz: Teil 2: Physikalische Eigenschaften
  • Herstellung und Eigenschaften von großformattgen Platten aus verdichtetem Frichten-und Tannenholz: Teil 3: Mechanische Eigenschaften
  • Self-tapping screws as reinforcements in beam supports
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  • Self-tapping screws and threaded rods as reinforcement for structural timber elements-A state-of-the-art report
  • Timber compression strength perpendicular to the grain – Testing of glulam beams with and without reinforcement
  • European technical assessment. Screws for use in timber construction
  • Adhesive groups and how they relate to the durability of bonded wood
  • Reinforcement of timber structures - The route to standardisation
  • Compression perpendicular to grain in timber - Bearing strength for a sill plate
  • Evaluation on structural performance of compressed wood as shear dowel
  • Development of a joint system using a compressed wooden fastener I: Evaluation of pull-out and rotation performance for a column-sill joint
  • Moment-rotation behaviour of beam-column connections fastened using compressed wood connectors
  • Evaluation of the structural behaviour of beam-beam connection systems using compressed wood dowels and plates
  • The elastic and ductile behaviour of CLT wall-floor connections and the influence of fastener length
  • An investigation of the viscoelastic creep behaviour of basalt fibre reinforced timber elements
  • Thermo-hydro and thermo-hydro-mechanical wood processing: An opportunity for future environmentally friendly wood products
  • Densified wood impregnated with phenol resin for reduced set-recovery
  • Review of state of the art of dowel laminated timber members and densified wood materials as sustainable engineered wood products for construction and building applications