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High-cycle fatigue behaviour of a timber-to-timber connection with self-tapping screws under lateral loading

https://research.thinkwood.com/en/permalink/catalogue2936
Year of Publication
2021
Topic
Mechanical Properties
Application
Wood Building Systems
Author
Niebuhr, Peter
Sieder, Mike
Organization
iBHolz Technische Universität Braunschweig
Publisher
Springer
Year of Publication
2021
Format
Journal Article
Application
Wood Building Systems
Topic
Mechanical Properties
Keywords
Self-Tapping Screws
European Yield Model
Fatigue Behaviour
Research Status
Complete
Series
European Journal of Wood and Wood Products
Summary
The high-cycle fatigue behaviour of a timber-to-timber connection with self-tapping screws is examined with the fasteners under bending due to their alignment lateral to the load direction. The cyclic tests were carried out with a sinusoidal non-reversed load (R=0.1) with a loading frequency of 5 Hz. The examined connection is designed for the quasistatic failure mechanism with two plastic hinges per shear plane according to Johansen’s theory (European Yield Model), which is mirrored in the observed fatigue failure. Based on 30 cyclic tests on four nominal stress levels (S={0.47,0.41,0.31,0.20}) in the finite-life regime the respective Wöhler-curve is obtained, showing high conformity with the test data due to a consideration of the specific density of the individual specimens. It is shown that the examined fasteners show a superior fatigue behaviour under bending compared to axial loading. A simple safe-side approach for the application of Wöhler-curves for axial loading of threaded fasteners to the present case of fastener bending is proposed, extending the field of possible applications for the results of existing and future studies of the behaviour under axial loading.
Online Access
Free
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Properties, Testing and Design of Cross Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue1938
Year of Publication
2018
Topic
Design and Systems
Mechanical Properties
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Abeysekera, Ishan
Bezzi, Stefano
Bidakov, Andrii
Björnfot, Anders
Bogensperger, Thomas
Brandner, Reinhard
Casagrande, Daniele
Ehrhart, Thomas
Fiorencis, Mariano
Follesa, Maurizio
Lawrence, Andrew
Lukacs, Ildiko
Moosbrugger, Thomas
Niebuhr, Peter
Pasca, Dag
Pradel, Claudio
Schickhofer, Gerhard
Serrano, Erik
Shotton, Elizabeth
Sieder, Mike
Sigrist, Christophe
Silly, Gregor
Smith, Andrew
Stojmanovska, Marta
Tomasi, Roberto
Tsipiras, Vasileios
Wiegand, Tobias
Editor
Brandner, Reinhard
Tomasi, Roberto
Moosbrugger, Thomas
Serrano, Erik
Dietsch, Philipp
Publisher
COST (European Cooperation in Science and Technology)
Year of Publication
2018
Format
Book/Guide
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Design and Systems
Mechanical Properties
Seismic
Keywords
Fatigue
Bending
Shear
Compression
Rolling Shear
Research Status
Complete
Summary
The intention of this STAR is a more detailed summary of the relevant work, done during the last 20 years on the topic of CLT. Additional references not included in the documents of SC5.T1 were added highlighting also CLT relevant publications not directly addressing content of the CLT draft version for EC 5. Apart from providing additional references for all topics and chapters of SC5.T1 draft documents edited by WG 2 / TG 1 & TG 3 within this STAR, further necessary scoentific work was identified and listed.
Online Access
Free
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Shear Properties of Cross Laminated Timber (CLT) under In-Plane Load: Test Configuration and Experimental Study

https://research.thinkwood.com/en/permalink/catalogue180
Year of Publication
2015
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Brandner, Reinhard
Dietsch, Philipp
Dröscher, Julia
Schulte-Wrede, Michael
Kreuzinger, Heinrich
Sieder, Mike
Schickhofer, Gerhard
Winter, Stefan
Organization
International Network on Timber Engineering Research (INTER)
Year of Publication
2015
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Diaphragms
Failure Mechanisms
Shear Strength
In-Plane Shear Test
Conference
INTER 2015
Research Status
Complete
Notes
August 24-27, 2015, Sibenik, Croatia
Summary
Consolidated knowledge of CLT properties under in-plane shear is crucial for typical structural applications such as wall and floor diaphragms, cantilevered CLT walls and CLT used as (deep) beams, in all cases potentially featuring holes or notches. The current technical approvals for CLT products contain differing regulations to determine their load-carrying capacities in-plane. Generally they imply a verification of the torsional stresses in the cross-section of the cross-wise glued elements as well as a verification of the shear stresses proportionally assigned to the boards of the top and cross layers. The basis of theoretical and practical considerations are the following three basic failure scenarios for a CLT-element under in-plane shear: (i) gross-shear (longitudinal shearing in all layers), (ii) net-shear (transverse shearing in all layers in weak direction), and (iii) torsion failure in the gluing interfaces between the layers
Online Access
Free
Resource Link
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