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7 records – page 1 of 1.

Dowelled Timber Connections with Internal Members of Densified Veneer Wood and Fibre-Reinforced Polymer Dowels

https://research.thinkwood.com/en/permalink/catalogue1498
Year of Publication
2016
Topic
Mechanical Properties
Connections
Material
LVL (Laminated Veneer Lumber)
Author
Palma, Pedro
Kobel, Peter
Minor, Alexander
Frangi, Andrea
Year of Publication
2016
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Topic
Mechanical Properties
Connections
Keywords
Timber-to-Timber
Densified Veneer Wood
Fibre-Reinforced Polymer
Dowel Type Fastener
Embedment Tests
Bending Test
Shear Test
Full Scale
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 236-243
Summary
The mechanical behaviour of timber-to-timber connections with internal panels of densified veneer wood (DVW) and fibre-reinforced polymer (FRP) dowels was experimentally assessed and a design method, based on EN 1995-1-1, was developed. Embedment tests on DVW plates and bending/shear tests on FRP dowels were performed to characterise these components, followed by full-scale tests of connections assembled with these materials. The results show that these connections exhibit a mechanical behaviour compatible with structural applications, regarding both load-carrying capacity and ductility. The proposed design model is based on EN 1995-1-1’s expressions for connections with dowel-type fasteners and gives good predictions of the experimental load-carrying capacities.
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Influence of the connector shape parameters in the structural behaviour of the adhesive-free timber floor panels

https://research.thinkwood.com/en/permalink/catalogue3125
Year of Publication
2022
Topic
Mechanical Properties
Application
Floors
Author
Moltini, Gonzalo
Baño, Vanesa
Organization
Universidad de la República
Publisher
Elsevier
Year of Publication
2022
Format
Conference Paper
Application
Floors
Topic
Mechanical Properties
Keywords
Adhesive-free Connection
Structural Yield
Timber-to-timber Panels
Conference
ICSI 2021 The 4th International Conference on Structural Integrity
Research Status
Complete
Series
Procedia Structural Integrity
Summary
Timber-to-timber panels (TTPs) are adhesive- and steel-free structural components formed by carpentry joints of Scots pine to be used as floors. A numerical model simulating bending tests on TTPs and considering timber as an orthotropic and bi-modulus material was validated from experimental results of deflection, and rolling shear strength. Since the serviceability and ultimate limit states of the TTPs was mainly defined by the rolling shear properties of the connectors, this paper aims to study the influence of different connector shape parameters in the structural behavior of the panels. For that, values of the connector height (hc varying between 40 and 100 mm), width (b1 varying between 40 and 100 mm) and the dove-tail angle (a varying between 45º and 75º) were introduced in the numerical models to obtain both failure load and stiffness for different span TTPs. Results showed that TTP deflection and shear stresses on the connectors decreases with the increase of the height and the width of the connectors. As the width of the connector (b1) increases, the maximum shear stress decreases up to 42%. For a same connector height, the angle of the dove-tail shows low influence in the maximum shear stress; however, it plays a greater role in the deflection of the panels. For the connectors of 40 mm of height TTP deflection was barely influenced by connector width; however, for higher connectors (hc = 60 mm), TTP deflection decreased up to 41% as width increases. So, new TTPs configurations varying the connector parameters showed an improvement on the deflection and on the shear stresses of the connectors.
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Interlocking Shear Wall Connections

https://research.thinkwood.com/en/permalink/catalogue2076
Year of Publication
2018
Topic
Connections
Mechanical Properties
Material
Timber-Concrete Composite
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Hybrid Building Systems
Shear Walls
Author
Claus, Timo
Riehle, Tobias
Seim, Werner
Götz, Tobias
Organization
University of Kassel
Year of Publication
2018
Format
Conference Paper
Material
Timber-Concrete Composite
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Hybrid Building Systems
Shear Walls
Topic
Connections
Mechanical Properties
Keywords
Timber-to-Timber
Interlocking
Load Bearing Capacity
Failure Modes
Conference
World Conference on Timber Engineering
Research Status
Complete
Summary
A new type of interlocking timber-to-timber connection was designed to simplify the structural details and the mounting conditions between wall elements and ceilings or floor panels in timber frame constructions. An experimental test series on different connector geometries was performed due to the unclear component behaviour and failure mechanism in mode II. The connection types achieved sufficient capacity but do not reach the predicted loads according to EC5. Thus, a mixed mode failure of mode I and II obviously occurs. A design approach is provided recognising all influences on the load-bearing capacity.
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Long-term Load—Deformation Behaviour of Timber-Concrete Joints

https://research.thinkwood.com/en/permalink/catalogue2525
Year of Publication
2012
Topic
Mechanical Properties
Application
Wood Building Systems
Author
Van de Kuilen, Jan-Willem
Dias, Alfredo
Publisher
ICE Publishing
Year of Publication
2012
Format
Conference Paper
Application
Wood Building Systems
Topic
Mechanical Properties
Keywords
Timber Joints
Dowel Type Fastener
Timber-to-Timber
Timber-to-Concrete
Creep
Conference
World Conference on Timber Engineering
Research Status
Complete
Series
Proceedings of the Institution of Civil Engineers - Structures and Buildings
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Mechanical Characterization of Timber-to-Timber Composite (TTC) Joints with Self-Tapping Screws in a Standard Push-Out Setup

https://research.thinkwood.com/en/permalink/catalogue3068
Year of Publication
2020
Topic
Connections
Author
Bedon, Chiara
Sciomenta, Martina
Fragiacomo, Massimo
Organization
University of Trieste
University of L’Aquila
Publisher
MDPI
Year of Publication
2020
Format
Journal Article
Topic
Connections
Keywords
Timber-to-timber Composite
Push-out Test
Inclined Self-tapping Screw
Finite Element Method
Cohesive Zone Modelling
Boundaries
Friction
Sensitivity Study
Research Status
Complete
Series
Applied Sciences
Summary
Self-tapping screws (STSs) can be efficiently used in various fastening solutions for timber constructions and are notoriously able to offer high stiffness and load-carrying capacity, compared to other timber-to-timber composite (TTC) joint typologies. The geometrical and mechanical characterization of TTC joints, however, is often hard and uncertain, due to a combination of various influencing parameters and mechanical aspects. Among others, the effects of friction phenomena between the system components and their reciprocal interaction under the imposed design loads can remarkably influence the final estimates on structural capacity, in the same way of possible variations in the boundary conditions. The use of Finite Element (FE) numerical models is well-known to represent a robust tool and a valid alternative to costly and time consuming experiments and allows one to further explore the selected load-bearing components at a more refined level. Based on previous research efforts, this paper presents an extended FE investigation based on full three-dimensional (3D) brick models and surface-based cohesive zone modelling (CZM) techniques. The attention is focused on the mechanical characterization of small-scale TTC specimens with inclined STSs having variable configurations, under a standard push-out (PO) setup. Based on experimental data and analytical models of literature, an extended parametric investigation is presented and correlation formulae are proposed for the analysis of maximum resistance and stiffness variations. The attention is then focused on the load-bearing role of the steel screws, as an active component of TTC joints, based on the analysis of sustained resultant force contributions. The sensitivity of PO numerical estimates to few key input parameters of technical interest, including boundaries, friction and basic damage parameters, is thus discussed in the paper.
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Performance of Timber Connections Exposed to Fire: A Review

https://research.thinkwood.com/en/permalink/catalogue233
Year of Publication
2015
Topic
Connections
Fire
Material
LVL (Laminated Veneer Lumber)
Author
Maraveas, Chrysanthos
Miamis, K.
E. Matthaiou, Ch.
Publisher
Springer US
Year of Publication
2015
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Topic
Connections
Fire
Keywords
Temperature
Steel-to-Timber
Wood-to-Wood
Research Status
Complete
Series
Fire Technology
Summary
Fire safety has always been a major concern in the design of timber construction. Even though wood is a highly combustible material, timber members can perform adequately under elevated temperatures. The thermal response of timber connections, however, is in most cases poor and determination of their fire resistance is usually the crucial factor in evaluating the overall load-bearing capacity of wood structures exposed to fire. The analysis of timber joints under fire conditions can be challenging due to their complexity and variety. After presenting the variation of the properties of timber with temperature, this paper reviews the fire performance of various connection types, such as bolted or nailed wood-to-wood and steel-to-timber joints. Results from relevant experimental programs and numerical studies are discussed in detail and future research needs are highlighted. The effect of several factors on the fire resistance of timber connections, such as the fastener diameter, timber thickness and joint geometry, is investigated and useful conclusions are drawn. Based on these, preliminary guidelines for the efficient design of timber connections under fire exposure are presented.
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Shear Properies of Timber-to-Timber Joints with Large Size Self-Tapping Screws

https://research.thinkwood.com/en/permalink/catalogue1003
Year of Publication
2014
Topic
Connections
Material
CLT (Cross-Laminated Timber)
Author
Kobayashi, Kenji
Yasumura, Motoi
Year of Publication
2014
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Connections
Keywords
self-tapping screw
Shear Tests
Joints
Timber-to-Timber
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Cross Laminated Timber (CLT) is a new material for midrise timber structures. CLT panels made of Japanese species like Sugi (Cryptomeria japonica D.Don) are developed in Japan. Seismic resistance of CLT structures are mainly determined by the performances of panel-to-panel connections. One of the main fasteners for CLT connections is large size self-tapping screws. It is possible to use not only CLT panels but also glulam structures. But there are few data for these joints and not used so much in Japan. In this study, shear tests of timbet-to-timber joints including CLT panels with large size self-tapping screws and several material tests were conducted. And estimating equations of single shearing properties were validated. In this study, shear tests of timbet-to-timber joints including CLT panels with large size self-tapping screws and several material tests were conducted. And estimating equations of single shearing properties were validated. Estimation curves were fitted well with test curves. It is confirmed that estimating equations are valid for timber-to-timber connections of large size self-tapping screws.
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7 records – page 1 of 1.