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13 records – page 1 of 2.

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
Author
Danielsson, Henrik
Jelec, Mario
Serrano, Erik
Rajcic, Vlatka
Publisher
Elsevier
Year of Publication
2019
Country of Publication
United States
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
In-Plane Loading
FE Analysis
Shear Mode III
Language
English
Research Status
Complete
Series
Engineering Structures
Online Access
Free
Resource Link
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Cross Laminated Timber at In-Plane Beam Loading – New Analytical Model Predictions and Relation to EC5

https://research.thinkwood.com/en/permalink/catalogue2232
Year of Publication
2018
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)

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
Country of Publication
Netherlands
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
In-Plane Loading
Eurocode 5
Strength
Shear Stress
Crossing Areas
Language
English
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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Determination of Coefficients of Friction for Laminated Veneer Lumber on Steel under High Pressure Loads

https://research.thinkwood.com/en/permalink/catalogue2822
Year of Publication
2020
Topic
Connections
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Author
Dorn, Michael
Habrova, Karolina
Koubek, Radek
Serrano, Erik
Publisher
Springer Nature
Year of Publication
2020
Country of Publication
Switzerland
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Topic
Connections
Keywords
Static Friction
High Pressure
Angle-to-grain
Moisture Content
Steel
Language
English
Research Status
Complete
Series
Friction
Summary
In this study, static coefficients of friction for laminated veneer lumber on steel surfaces were determined experimentally. The focus was on the frictional behaviors at different pressure levels, which were studied in combination with other influencing parameters: fiber orientation, moisture content, and surface roughness. Coefficients of friction were obtained as 0.10–0.30 for a smooth steel surface and as high as 0.80 for a rough steel surface. Pressure influenced the measured coefficients of friction, and lower normal pressures yielded higher coefficients. The influence of fiber angle was observed to be moderate, although clearly detectable, thereby resulting in a higher coefficient of friction when sliding perpendicular rather than parallel to the grain. Moist specimens contained higher coefficients of friction than oven-dry specimens. The results provide realistic values for practical applications, particularly for use as input parameters of numerical simulations where the role of friction is often wrongfully considered.
Online Access
Free
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Dowel Deformations in Multi-Dowel LVL-Connections Under Moment Loading

https://research.thinkwood.com/en/permalink/catalogue583
Year of Publication
2015
Topic
Connections
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Author
Bader, Thomas
Schweigler, Michael
Hochreiner, Georg
Serrano, Erik
Enquist, Bertil
Dorn, Michael
Publisher
Taylor&Francis Online
Year of Publication
2015
Country of Publication
United Kingdom
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Topic
Connections
Mechanical Properties
Keywords
Ductility
Bending Moment
Steel Dowels
Double-Shear
Steel-to-Timber
Four Point Bending Test
Language
English
Research Status
Complete
Series
Wood Material Science & Engineering
Summary
The aim of the experimental study presented herein is the assessment and quantification of the behavior of individual dowels in multi-dowel connections loaded by a bending moment. For this purpose, doubleshear, steel-to-timber connections with nine steel dowels arranged in different patterns and with different dowel diameters were tested in 4-point bending. In order to achieve a ductile behavior with up to 7° relative rotation, the connections were partly reinforced with self-tapping screws. The reinforcement did not influence the global load-deformation behavior, neither for dowel diameters of 12 mm nor for 20 mm, as long as cracking was not decisive. The deformation of the individual dowels was studied by means of a non-contact deformation measurement system. Thus, the crushing deformation, i.e. the deformation at the steel plate, and the bending deformation of the dowels could be quantified. In case of 12 mm dowels, the bending deformation was larger than the crushing deformation, while it was smaller in case of 20 mm dowels. Moreover, dowels loaded parallel to the grain showed larger bending deformations than dowels loaded perpendicular to the grain. This indicates that the loading of the individual dowels in the connection differs, depending on their location.
Online Access
Free
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Experimental Investigation of the Axial Strength of Glued-in Rods in Cross Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue2230
Year of Publication
2018
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Azinovic, Boris
Serrano, Erik
Kramar, Miha
Pazlar, Tomaž
Publisher
Springer Netherlands
Year of Publication
2018
Country of Publication
Netherlands
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Glued-In Rods
Pull-Pull Tests
Failure Mechanisms
Language
English
Research Status
Complete
Series
Materials and Structures
ISSN
1871-6873
Online Access
Free
Resource Link
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Experimental Testing of Load-Bearing Timber–Glass Composite Shear Walls and Beams

https://research.thinkwood.com/en/permalink/catalogue860
Year of Publication
2015
Material
Timber-Glass Composite
Application
Shear Walls
Beams
Author
Kozlowski, Marcin
Dorn, Michael
Serrano, Erik
Publisher
Taylor&Francis Online
Year of Publication
2015
Country of Publication
United Kingdom
Format
Journal Article
Material
Timber-Glass Composite
Application
Shear Walls
Beams
Keywords
Shear Loading
Vertical Loading
Adhesives
Four Point Bending Test
Load Carrying Capacity
Language
English
Research Status
Complete
Series
Wood Material Science & Engineering
Summary
The paper presents results from the experimental testing of load-bearing timber–glass composite shear walls and beams. Shear wall specimens measuring 1200 × 2400 mm2 manufactured with three adhesives of varying stiffness were tested. Twelve specimens with a single 10 mm thick glass pane and one specimen with an additional insulating glass unit were produced. The testing procedures involved various loading conditions: pure vertical load and different combinations of shear and vertical loading. The test results showed that the adhesive had only a minor influence on the buckling load which was the main failure mechanism. 240 mm high and 4800 mm long timber–glass beams manufactured with adhesives of different stiffness were tested. For the webs, two types of glass were used: annealed float and heat-strengthened glass, in both cases 8 mm thick panes were used. In total, 12 beams were tested in four-point bending until failure. Despite the considerable difference in adhesive stiffness, beam bending stiffness was similar. Concerning load-bearing capacity, the beams with heat-strengthened glass were approximately 50% stronger than the beams made using annealed float glass.
Online Access
Free
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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)
Author
Azinovic, Boris
Danielsson, Henrik
Serrano, Erik
Kramar, Miha
Publisher
ScienceDirect
Year of Publication
2019
Country of Publication
Netherlands
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Connections
Mechanical Properties
Keywords
Glued-In Rods
FE Analysis
Numerical Modelling
Load Bearing Capacity
Language
English
Research Status
Complete
Series
Construction and Building Materials
Online Access
Free
Resource Link
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Identification of Weak Sections in Glulam Beams using Calculated Stiffness Profiles based on Lamination Surface Scanning

https://research.thinkwood.com/en/permalink/catalogue196
Year of Publication
2014
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Oscarsson, Jan
Serrano, Erik
Olsson, Anders
Enquist, Bertil
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Bending Strength
Failure
Modulus of Elasticity
Laser Scanning
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Models for estimation of structural properties of glued laminated timber (glulam) are generally based on the relationship between properties of the individual laminations and properties of the glulam. In this investigation, a recently presented machine strength grading method based on laser scanning of fibre direction fields was applied for determination of axial modulus of elasticity (MOE) profiles along glulam laminations. These profiles were then used to calculate edgewise bending MOE (EB) profiles of glulam beams. The objectives were to investigate the relationship between position of bending failure and position of lowest EB value along investigated beams, and the relationship between the mentioned EB value and bending strength of the beams. It was found that both relationships were rather weak, whereas local bending MOE determined in accordance with EN 408 was predicted with high accuracy on the basis of EB profiles.
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

13 records – page 1 of 2.