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10 records – page 1 of 1.

Dynamical Properties of a Large Glulam Truss for a Tall Timber Building

https://research.thinkwood.com/en/permalink/catalogue2036
Year of Publication
2018
Topic
Wind
Mechanical Properties
Connections
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Trusses
Author
Landel, Pierre
Linderholt, Andreas
Johansson, Marie
Organization
Linnaeus University
Year of Publication
2018
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Trusses
Topic
Wind
Mechanical Properties
Connections
Keywords
Dynamic Properties
Finite Element (FE) Model
Vibration Test
Conference
World Conference on Timber Engineering
Research Status
Complete
Summary
When designing a tall timber building, the accelerations due to wind loads are in many cases decisive. The parameters governing the dynamic behaviour of the building are the structure's stiffness, damping and mass together with the loads. The first two parameters are not well-known during the serviceability limit state of timber structures generally and of timber connections specifically. In this study, dynamical properties of a large glulam truss, a part of the vertical and horizontal structural system in a residential six-storey timber building, are estimated from measurements made in the manufacturing plant. The timber members of the truss are joined with slotted-in steel plates and dowels. Forced vibrational test data are used to extract the dynamical properties. Finite element (FE) models, supported by the experimental results, were developed and simulations, to study the influence of the connection stiffnesses on the total behaviour, were performed. The vibration test results of measurements made on separate structural parts give valuable input to model timber structures and better possibilities to simulate the dynamic behaviour of tall timber buildings as well as the load distribution in wooden structures in the serviceability limit state.
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Free
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Experimental investigations on the load-bearing behaviour of traditional and newly developed step joints for timber structures

https://research.thinkwood.com/en/permalink/catalogue2958
Year of Publication
2022
Topic
Mechanical Properties
Connections
Application
Trusses
Author
Braun, Matthias
Pantscharowitsch
Kromoser, Benjamin
Organization
University of Natural Resources and Life Sciences Vienna
Publisher
Elsevier
Year of Publication
2022
Format
Journal Article
Application
Trusses
Topic
Mechanical Properties
Connections
Keywords
Timber Joints
Step-joint
Carpentry Joints
Research Efficiency
Research Status
Complete
Series
Construction and Building Materials
Summary
In this paper the load-bearing behaviour of traditional and newly developed timber-timber connections, multi-step and free formed, are analysed within an extensive investigation focusing on joint failure. DIC measurements allowed for an assessment of the initial behaviour of the systems and their specific failure modes. By comparing the stiffness and various load levels to those of typical joint designs the improved load-bearing behaviour of the proposed joints was demonstrated while defining the range of the obtained linear-elastic phase. The results show that the onset of failure, based on the ultimate load, strongly depends on the geometry of the joint.
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Free
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Experimental Study and Numerical Simulation Analysis on Vertical Vibration Performances of 12 m Span Wood Truss Joist Floors

https://research.thinkwood.com/en/permalink/catalogue3207
Year of Publication
2022
Topic
Acoustics and Vibration
Application
Trusses
Author
Zhang, Zhanyi
Wang, Shuangyong
Deng, Hao
Zhou, Haibin
Organization
Chinese Academy of Forestry
Editor
Chen, Jun
Wang, Haoqi
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Application
Trusses
Topic
Acoustics and Vibration
Keywords
Wood Floor
Floor Vibration
Vibration Serviceability
Numerical Methods
Research Status
Complete
Series
Buildings
Summary
Walking-induced vibration control in wood floors is a critical issue attracting the attention of many researchers and engineers. This paper presents an experimental study applying static deflection tests, modal tests, and pedestrian load tests to a series of full-scale 12 m span tooth plates connected to wood truss joist floors with strongbacks and partition walls. A comparison of the calculation error of vibration parameters between the theoretical formula and a numerical model was also conducted. The results show that strongbacks and partition walls effectively reduce both the vertical displacement and the root means acceleration at the center of the floor under pedestrian load but increases the natural frequency. The partition wall can achieve a better vibration-reduction effect than strongbacks. The error of the finite element model is higher than that of the theoretical formula. Using the theoretical formula in engineering wood floor design is recommended.
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Free
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Fire Performance of Metal-Free Timber Connections

https://research.thinkwood.com/en/permalink/catalogue2186
Year of Publication
2015
Topic
Fire
Connections
Material
LVL (Laminated Veneer Lumber)
CLT (Cross-Laminated Timber)
Other Materials
Application
Wood Building Systems
Beams
Columns
Trusses

The influence of inaccuracies in the production process on the load-bearing behaviour of timber step joints

https://research.thinkwood.com/en/permalink/catalogue3115
Year of Publication
2022
Topic
Connections
Application
Trusses
Author
Braun, Matthias
Kromoser, Benjamin
Organization
University of Natural Resources and Life Sciences Vienna
Publisher
Elsevier
Year of Publication
2022
Format
Journal Article
Application
Trusses
Topic
Connections
Keywords
Timber Joints
Timber Truss
Step-joint
Carpentry Joints
Resource Efficiency
Research Status
Complete
Series
Construction and Building Materials
Summary
Inaccuracies within timber step joints are a perennial problem of the wood construction industry. Even perfectly constructed carpentry step joints can become imperfect due to a change in moisture content. The predominant question when looking at step joints with gaps is to what extent the load-bearing behaviour is influenced by these inaccuracies. The authors look beyond this question and investigate if intentionally manufactured gaps could have a positive influence on the load-bearing behaviour and the failure mode of regular and newly designed carpentry joints.
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Free
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Performant Connections - A Must for Veneer-Based Products

https://research.thinkwood.com/en/permalink/catalogue1535
Year of Publication
2016
Topic
Connections
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Application
Trusses
Author
Gehri, Ernst
Year of Publication
2016
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Trusses
Topic
Connections
Mechanical Properties
Keywords
Beech
Glued-In Rods
Ductility
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 891-899
Summary
The structural use of high-strength veneer-based products requires the development of more performant connections, than those actually used. Great development is going on with glued-in bars. Besides high efficiency, adequate ductility may be achieved, resulting in robust structural components. The presentation will focus in the application of glued-in bars inserted parallel to the grain. Generally individual glued-in bars show a very brittle behaviour. Through special shaping of the steel rod and controlled application of ductile steels, ductile connections with groups of glued-in rods are now realistic. This is shown in typical applications like tension joints, bending joints in beams and trusses. By extending the ductility requirements, plastic design of such connections will now be possible. This opens the way for more performant design of complex structures.
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Free
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Reduced and test-data correlated FE-models of a large timber truss with dowel-type connections aimed for dynamic analyses at serviceability level

https://research.thinkwood.com/en/permalink/catalogue3004
Year of Publication
2022
Topic
Mechanical Properties
Serviceability
Acoustics and Vibration
Material
Glulam (Glue-Laminated Timber)
Application
Trusses
Author
Landel, Pierre
Linderholt, Andreas
Organization
RISE Research Institutes of Sweden
Linnaeus University
Publisher
Elsevier
Year of Publication
2022
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Trusses
Topic
Mechanical Properties
Serviceability
Acoustics and Vibration
Keywords
Tall Timber Structures
Mechanical Connection
Dowel-type Fastener
Wind-induced Vibration
Modal Testing Properties
Connection Stiffness
FE-Model Reduction
Research Status
Complete
Series
Engineering Structures
Summary
The rise of wood buildings in the skylines of cities forces structural dynamic and timber experts to team up to solve one of the new civil-engineering challenges, namely comfort at the higher levels, in light weight buildings, with respect to wind-induced vibrations. Large laminated timber structures with mechanical joints are exposed to turbulent horizontal excitation with most of the wind energy blowing around the lowest resonance frequencies of 50 to 150 m tall buildings. Good knowledge of the spatial distribution of mass, stiffness and damping is needed to predict and mitigate the sway in lighter, flexible buildings. This paper presents vibration tests and reductions of a detailed FE-model of a truss with dowel-type connections leading to models that will be useful for structural engineers. The models also enable further investigations about the parameters of the slotted-in steel plates and dowels connections governing the dynamical response of timber trusses.
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Study on a Newly Developed Diagonal Connection for Hybrid Timber Trusses Made of Spruce Glulam and Beech Laminated Veneer Lumber

https://research.thinkwood.com/en/permalink/catalogue2459
Year of Publication
2019
Topic
Connections
Design and Systems
Material
Glulam (Glue-Laminated Timber)
LVL (Laminated Veneer Lumber)
Application
Trusses
Author
Steige, Yvonne
Frese, Matthias
Publisher
Taylor&Francis Online
Year of Publication
2019
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
LVL (Laminated Veneer Lumber)
Application
Trusses
Topic
Connections
Design and Systems
Keywords
Beech
Spruce
Diagonal Connection
Research Status
Complete
Series
Wood Material Science & Engineering
Online Access
Free
Resource Link
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Timber Trusses Made of European Beech LVL

https://research.thinkwood.com/en/permalink/catalogue1527
Year of Publication
2016
Topic
Connections
Design and Systems
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Application
Trusses
Author
Kobel, Peter
Frangi, Andrea
Steiger, René
Year of Publication
2016
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Trusses
Topic
Connections
Design and Systems
Mechanical Properties
Keywords
Europe
Beech
Dowel-Type Connections
Ductile Failure
Embedment Tests
Embedment Strength
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 667-674
Summary
This paper presents an experimental and analytical investigation on the application of laminated veneer lumber (LVL) made of European beech wood (fagus sylvatica L.) in timber truss structures. Particular focus is laid on developing improved design approaches for dowel-type connections and on promoting ductile failure behaviour, as the connections in timber trusses are generally governing the performance of the whole structure. Embedment tests were carried out in order to assess the embedment strength values for beech LVL, which are necessary to design dowel-type connections. The results showed higher values for beech LVL, as compared to estimations using existing formulas from design codes. A series of tensile connection tests showed that, using cross-layered beech LVL, ductile dowel-type connections with high load-carrying capacities can be designed, given that premature brittle failures are prevented. Lastly, tests on full truss structures confirmed that the favourable behaviour of dowel-type connections in cross-layered beech LVL can be implemented in truss systems, improving the global behaviour of the whole structural element.
Online Access
Free
Resource Link
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Wood Design Manual 2017

https://research.thinkwood.com/en/permalink/catalogue2160
Year of Publication
2017
Topic
Design and Systems
Connections
Fire
Seismic
Material
CLT (Cross-Laminated Timber)
NLT (Nail-Laminated Timber)
Glulam (Glue-Laminated Timber)
LSL (Laminated Strand Lumber)
LVL (Laminated Veneer Lumber)
PSL (Parallel Strand Lumber)
Light Frame (Lumber+Panels)
DLT (Dowel Laminated Timber)
Application
Beams
Bridges and Spans
Columns
Floors
Ceilings
Arches
Shear Walls
Trusses
Walls

10 records – page 1 of 1.