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Stress-laminated timber decks in bridges: Friction between lamellas, butt joints and pre-stressing system

https://research.thinkwood.com/en/permalink/catalogue2891
Year of Publication
2020
Application
Decking
Author
Massaro, Francesco Mirko
Malo, Kjell Arne
Organization
Norwegian University of Science and Technology
Publisher
Elsevier
Year of Publication
2020
Format
Journal Article
Application
Decking
Keywords
Stress Laminated
Timber Bridges
Butt-Joint
Stiffness
Friction
Pre-Stress
Research Status
Complete
Series
Engineering Structures
Summary
Stress-laminated timber (SLT) decks in bridges are popular structural systems in bridge engineering. SLT decks are made from parallel timber beams placed side by side and pre-stressed together by means of steel rods. SLT decks can be in any length by just using displaced butt joints. The paper presents results from friction experiments performed in both grain and transverse direction with different levels of pre-stress. Numerical simulations of these experiments in addition to comparisons to full-scale experiments of SLT decks presented in literature verified the numerical model approach. Furthermore, several alternative SLT deck configurations with different amounts of butt joints and pre-stressing rod locations were modelled to study their influence on the structural properties of SLT decks. Finally, some recommendations on design of SLT bridge decks are given.
Online Access
Free
Resource Link
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Tectonic Strategies for Using Fast-Growing, Low-Grade Softwoods for Engineered Wood Products

https://research.thinkwood.com/en/permalink/catalogue565
Year of Publication
2014
Topic
Mechanical Properties
Material
DLT (Dowel Laminated Timber)
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Author
Fleming, Patrick
Ramage, Michael
Year of Publication
2014
Format
Conference Paper
Material
DLT (Dowel Laminated Timber)
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Topic
Mechanical Properties
Keywords
Low-Grade
Softwood
Polymer Impregnated
Stress Laminated
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
The proposed paper presents two alternative strategies for using fast-growing, low-grade softwood for modern engineered wood products. A chemical based strategy is explored first with the testing of polymer-impregnated small clear wood samples. A second mechanical based strategy based on the tectonics of stress-laminated bridge decks is examined in further detail with 1:10 scaled structural models, followed later on by full-scale testing. The relative benefits and disadvantages of each strategy are compared to each other, and benchmarked against regular sawn timber and conventional engineered wood products like glulam and cross-laminated timber.
Online Access
Free
Resource Link
Less detail