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Rotational Stiffness at Ridges of Timber Folded-Plate Structures

https://research.thinkwood.com/en/permalink/catalogue912
Year of Publication
2015
Topic
Connections
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Author
Roche, Stéphane
Mattoni, Geoffroy
Weinand, Yves
Publisher
SAGE Publications
Year of Publication
2015
Country of Publication
United States
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Topic
Connections
Mechanical Properties
Keywords
Stiffness
Folded-plate
Language
English
Research Status
Complete
Series
International Journal of Space Structures
Summary
Folded-plate structures provide an efficient design using thin laminated veneer lumber panels. Inspired by Japanese furniture joinery, the multiple tab-and-slot joint was developed for the multi-assembly of timber panels with non-parallel edges without adhesive or metal joints. Because the global analysis of our origami structures reveals that the rotational stiffness at ridges affects the global behaviour, we propose an experimental and numerical study of this linear interlocking connection. Its geometry is governed by three angles that orient the contact faces. Nine combinations of these angles were tested and the rotational slip was measured with two different bending set-ups: closing or opening the fold formed by two panels. The non-linear behaviour was conjointly reproduced numerically using the finite element method and continuum damage mechanics.
Online Access
Free
Resource Link
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Shear Resistance and Failure Modes of Edgewise Multiple Tab-and-Slot Joint (MTSJ) Connection with Dovetail Design for Thin LVL Spruce Plywood Kerto-Q Panels

https://research.thinkwood.com/en/permalink/catalogue1563
Year of Publication
2016
Topic
Connections
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Author
Dedijer, Mira
Roche, Stéphane
Weinand, Yves
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Topic
Connections
Mechanical Properties
Keywords
Geometry
Multiple Tab-and-Slot Joints
Shear Test
Finger Joint
Failure Modes
Shear Strength
Shear Stiffness
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1548-1555
Summary
The objective of this study is to experimentally analyse effects of geometry variations of Multiple Tab and Slot Joint (MTSJ) connection with dovetail design on shear mechanical behaviour. Direct shear test was performed on angular ( = 90° ) MTSJ connection made of Kerto-Q 21mm-thick spruce plywood laminated veneer lumber (LVL) panels. Connection was examined in its configuration of three tabs/slots per edge. Nine different geometries of MTSJ connection were tested. In order to provide better understanding of mechanical behaviour of the connection, results were compared with finger joint (F) connection. Two characteristic failure modes were observed. Influence of three theta angles which define geometry of MTSJ connection was analysed concerning shear strength and stiffness. Connection showed very ductile shear behaviour with relatively high stiffness. It has been shown that by increasing q 3 angle above 30°, shear strength decreases. On the other hand, the highest influence on shear stiffness is due to q 2 and q 3 rotations.
Online Access
Free
Resource Link
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