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An Innovative Hybrid Timber Structure in Japan: Beam-to-Beam Moment Resisting Connection

https://research.thinkwood.com/en/permalink/catalogue1581
Year of Publication
2016
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Kusumoto, Shigeharu
Shioya, Shinichi
Kawabe, Ryosuke
Inomoto, Kotaro
Year of Publication
2016
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Connections
Mechanical Properties
Keywords
Steel Bars
Epoxy
Beam-to-Beam
Four Point Bending Test
Short-term
Long-term
Ductility
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1791-1798
Summary
Hybrid composite glulam timber reinforced using deformed steel bars and epoxy resin adhesive (RGTSB), was significantly developed in Kagoshima University. In this paper, a beam-to-beam connection for RGTSB and experimental data on the connection are presented. Two 2:3-scaled simply-supported beams under four-point flexural bending in short-term loading, connection elements under short and long-term tension loading were tested. The connection for RGTSB beam performed on bending behaviour such as non-connection RGTSB beam, especially better on ductility.
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Effects of Climate Change on Structural Behavior of Wood to Wood Connections

https://research.thinkwood.com/en/permalink/catalogue1561
Year of Publication
2016
Topic
Connections
Moisture
Material
Solid-sawn Heavy Timber
Application
Beams
Columns
Author
Jeong, Gi Young
Lee, So Sun
Year of Publication
2016
Format
Conference Paper
Material
Solid-sawn Heavy Timber
Application
Beams
Columns
Topic
Connections
Moisture
Keywords
Moisture Content
Dovetail
Beam-to-Beam
Column-to-Column
Structural Behavior
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1464-1471
Summary
Dovetail connections were applied for connecting column to column, and beam to beam in traditional timber framed buildings. Previous studies were mainly focused on mechanical behaviour of the connection. However, there was a lack of study on the structural behaviour of the connection under different moisture contents. The goal of this study was to analyse the effects of moisture content on swelling behaviour and structural performance of dovetail connection. Different sizes of 120×120, 180×180, 180×240 mm from larix kaempferi and pinus koraiensis were used. Dimensional changes of dovetail connection made from different species showed different trends with an increment of size. The dimensional changes of member of dovetail connection from larix kaempferi were higher than those of dovetail connection made from pinus koraiensis, whereas the dimensional changes of geometric variables of dovetail connection from pinus koraiensis were higher than those of dovetail connection made from larix kaempferi.
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Evaluation of the Structural Behaviour of Beam-Beam Connection Systems Using Compressed Wood Dowels and Plates

https://research.thinkwood.com/en/permalink/catalogue2050
Year of Publication
2018
Topic
Connections
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Mehra, Sameer
O’Ceallaigh, Conan
Hamid-Lakzaeian, Fatemeh
Guan, Zhongwei
Sotayo, Adeayo
Harte, Annette
Organization
National University of Ireland Galway
University of Liverpool
Year of Publication
2018
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Connections
Keywords
Beam-to-Beam
Compressed Wood Dowels
Compressed Wood Plates
Four Point Bending Test
Load Carrying Capacity
Failure Modes
Moment Resistance
Rotational Stiffness
Conference
World Conference on Timber Engineering
Research Status
Complete
Summary
To support the transition to a bio-based society, it is preferable to substitute metallic fasteners and adhesives in timber construction with an eco-friendly alternative. Recent studies have identified compressed wood dowels and plates as a possible substitute for metallic fasteners in contemporary and mainstream applications. In this study, a spliced beam-beam connection system using compressed wood dowels and slotted-in compressed wood plates was examined under four-point bending. The study has considered specimens with compressed wood dowels of 10 mm diameter and compressed wood plates of 10 mm thickness. The load carrying capacity of connections using compressed wood dowels and plates were compared to connections utilising steel dowels and plates of equivalent capacity. Typical failure modes, moment resistance and rotational stiffness of both connection systems are evaluated on the basis of the experimental results. Tests have demonstrated similar failure modes when comparing steel-timber and compressed wood-timber connection systems. The mean failure load for the compressed wood-timber connection system is only 20.3% less than that achieved for the steel-timber connection system. The mean rotational stiffness of the compressed wood-timber connection system is 18.55% less than that achieved for the steel-timber connection system. These preliminary results demonstrate the potential for the use of compressed wood elements in the manufacture of timber connections.
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Experimental Investigation of Glued Laminated Timber Beam to Beam Connections Filled with Cement Based Filler

https://research.thinkwood.com/en/permalink/catalogue427
Year of Publication
2013
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Gecys, Tomas
Daniunas, Alfonsas
Publisher
ScienceDirect
Year of Publication
2013
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Connections
Mechanical Properties
Keywords
Beam-to-Beam
Semi-Rigid Joints
Eurocode 5
Steel Details
Research Status
Complete
Series
Procedia Engineering
Summary
In this article semi rigid joints of timber structures are analysed which are applied in beam to beam connections. The main design principles of semi rigid timber joints’ are discussed. New type of joint construction for glued laminated timber elements’ is proposed and laboratory experimentally tested. Beam to beam joint is installed using welded steel details which are anchored into timber elements. Steel detail's back T shape part is used for anchoring into timber element. Beam to beam joint is symmetric along the longitudinal element's axis; it has two steel details in tension and compression zones which enable this joint to take axial, shear forces and bending moment. To avoid initial free rotation of the joint; filler is used to ensure contact between glued laminated timber element and steel detail. Cement based filler with polymer fibres is used for this purpose. Three joints with the same geometrical and physical parameters are experimentally tested in four point bending; analyzed connection is in the middle of simply supported beam. Purpose of laboratory experiments is to determine the rotational bearing capacity of the new type joint and to compare these results with theoretical values calculated according to Eurocode 5.
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Mechanical Behavior of Bolted Glulam Beam-to-Column Connections with Slotted-In Steel Plates Under Pure Bending

https://research.thinkwood.com/en/permalink/catalogue1503
Year of Publication
2016
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Columns
Author
Wang, Mingqian
Song, Xiaobin
Gu, Xianglin
Wu, Yajie
Year of Publication
2016
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Columns
Topic
Connections
Mechanical Properties
Keywords
Full Scale
Bolted Connection
Beam-to-Beam
Beam-to-Column
Steel Plates
Finite Element Model
Failure Modes
Moment Resistance
Continuum Damage Mechanics
Brittle Failure
Ductile Failure
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 309-316
Summary
In this study, five full-scale bolted glulam beam-to-beam connections with slotted-in steel plates were conducted under a third-point loading, and a three-dimensional finite element method based model was also established to investigate the failure modes and moment resistance of such connections. A material model based on the Continuum Damage Mechanics (CDM) theory was developed to predict damage evolution of wood. Different damage variables were used to consider the ductile and brittle failure modes of wood, respectively. The test results indicated that splitting and shear plug failures were the main failure modes. The numerical analysis model prediction achieved fair agreements with the test results. The research could provide the guide for the design of bolted beam-to-column connections in heavy timber structures.
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