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11 records – page 1 of 2.

Brittle failure of laterally loaded self-tapping screw connections for cross-laminated timber structures

https://research.thinkwood.com/en/permalink/catalogue3120
Year of Publication
2022
Topic
Connections
Material
CLT (Cross-Laminated Timber)
Author
Azinovic, Boris
Cabrero, José Manuel
Danielsson, Henrik
Pazlar, Tomaž
Organization
Slovenian National Building and Civil Engineering Institute
University of Navarra
Lund University
Publisher
Elsevier
Year of Publication
2022
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Connections
Keywords
Brittle Failure
Analytical Model
Overstrength
Research Status
Complete
Series
Engineering Structures
Summary
The performance of structural timber connections is of utmost importance since they control the global response of the building. A ductile failure mechanism on the global scale is desirable, especially in the design of structures in seismic areas, where dissipative components in which ductile failure modes need to be ensured are considered. Therefore, the knowledge of possible brittle failure modes of connections is crucial. The paper investigates the brittle failures of laterally loaded dowel-type connections in cross-laminated timber subjected to tensile load in a lap joint configuration through experimental investigations and analytical estimations. A set of 13 different test series has been performed with fully threaded self-tapping screws of 8 mm diameter and different lengths (40 to 100 mm) in cross-laminated timber composed of 3 or 5 layers (layer thickness range from 20 to 40 mm), giving rise to the activation of different brittle failure modes at different depths. Plug shear was among the most typically observed failure modes. A previously proposed model for the brittle capacity was applied to the tested connections at the characteristic level. As shown by the performed statistical analysis, the existing model is not reliable and mainly unconservative. A very low performance is observed (CCC = 0.299), but with a good correlation (c = 0.750) for the tests in the parallel direction. Further research work is required to improve the current model predictions and to gain a better understanding of the underlying resisting mechanisms.
Online Access
Free
Resource Link
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Cross Laminated Timber at In-Plane Beam Loading - Comparison of Model Predictions and FE-Analyses

https://research.thinkwood.com/en/permalink/catalogue2122
Year of Publication
2019
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Beams

Cross Laminated Timber at In-Plane Beam Loading – Prediction of Shear Stresses in Crossing Areas

https://research.thinkwood.com/en/permalink/catalogue1305
Year of Publication
2018
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Beams
Author
Danielsson, Henrik
Serrano, Erik
Publisher
ScienceDirect
Year of Publication
2018
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
In-Plane Loading
Eurocode 5
Strength
Shear Stress
Crossing Areas
Research Status
Complete
Series
Engineering Structures
Summary
Cross Laminated Timber (CLT) at in-plane beam loading conditions present a very complex stress state and many failure modes need to be considered in design. The work presented here aims at finding improvements of a specific analytical model for stress analysis and strength verification that has been suggested in literature and which is also suggested as a basis for design equations for the next version of Eurocode 5. Although the model has appealing properties it suffers from some drawbacks related to the assumed distributions of internal forces which, based on comparison to finite element analysis, appear to be inaccurate. The main focus in this paper is on model predictions regarding the distribution and magnitude of internal forces acting in the crossing areas between longitudinal and transversal laminations. The proposed modified model assumptions regarding the distribution of lamination shear forces, which in turn influence the forces acting in the crossing areas, are suggested to be taken into account in design of CLT beams.
Online Access
Free
Resource Link
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Glued-in Rods in Cross Laminated Timber – Numerical Simulations and Parametric Studies

https://research.thinkwood.com/en/permalink/catalogue2231
Year of Publication
2019
Topic
Connections
Mechanical Properties
Material
CLT (Cross-Laminated Timber)

Improved low-frequency performance of cross-laminated timber floor panels by informed material selection

https://research.thinkwood.com/en/permalink/catalogue2961
Year of Publication
2021
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Persson, Peter
Flodén, Ola
Danielsson, Henrik
Peplow, Andrew
Andersen, Lars Vabbersgaard
Organization
Lund University
Aarhus University
Publisher
Elsevier
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Acoustics and Vibration
Keywords
Vibroacoustic Response
Floor Vibration
Wood Species
Strength Class
Finite Element Method (FEM)
Research Status
Complete
Series
Applied Acoustics
Summary
The paper demonstrates improved structural low-frequency vibroacoustic performance of cross-laminated timber (CLT) floor panels by informed selection of the wood material. The use of wood species and strength classes that are not traditionally assigned to CLT panels was investigated in order to study their influence on dynamic characteristics and vibroacoustic response metrics. The potential of each of the orthotropic material properties to alternate the vibration response was examined to determine the governing parameters of the low-frequency vibroacoustic performance. The effects on transfer mobility response functions, and eigenfrequencies and mode shapes were used for a rigorous performance study of the panels. It was found that using laminations with stiffness properties typical for hardwoods ash, beech, and birch can significantly improve the performance of a CLT floor panel, and they outperform laminations of typical softwood strength classes.
Online Access
Free
Resource Link
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In-Plane Loaded CLT Beams – Tests and Analysis of Element Lay-Up

https://research.thinkwood.com/en/permalink/catalogue2234
Year of Publication
2017
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Beams

Strength and Stiffness of Cross Laminated Timber at In-Plane Beam Loading

https://research.thinkwood.com/en/permalink/catalogue2233
Year of Publication
2017
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Beams

The strength of Glulam Beams with Holes - A Probabilistic Fracture Mechanics Method and Experimental Tests

https://research.thinkwood.com/en/permalink/catalogue2238
Year of Publication
2009
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams

11 records – page 1 of 2.