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A Contribution to the Design of Ribbed Plates

https://research.thinkwood.com/en/permalink/catalogue1692
Year of Publication
2016
Topic
Design and Systems
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Author
Augustin, Manfred
Zimmer, Severin
Bogensberger, Thomas
Sleik, Tim
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Topic
Design and Systems
Mechanical Properties
Keywords
Ribbed Plates
Elastic Model
Shear Stresses
Tensile Stresses
Notches
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4262-4271
Summary
The topic of this paper is the discussion of a proposal for the design of ribbed plates built-up with CLT (plate)- and GLT (ribs)- members. The suggested elastic model is based on the work of Abdelouahed [13] and Smith and Teng [14] for the strengthening of concrete members with FRP plates and will be applied for the mentioned loadcarrying timber elements. As a result so far it could be observed, that high peaks of shear and tensile stresses perpendicular to the interface (glue-line) occur due to the elastic consideration of the material. The model was evaluated by some pre-test which showed an acceptable correlation between the predictions of the model and a 2D-FEM analysis. It is evident, that the notches at the end of the rips must be reinforced by e.g. self-tapping screws or glued in rod to achieve effective solutions for this load carrying element. With the discussed model the shear and tensile stresses and forces resp. perpendicular to the interface can be computed.
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Timber-Steel-Composite – A Possibility for Hybrid Structures of Long Span Timber Floors

https://research.thinkwood.com/en/permalink/catalogue1697
Year of Publication
2016
Topic
Mechanical Properties
Material
Steel-Timber Composite
Application
Floors
Author
Zimmer, Severin
Augustin, Manfred
Year of Publication
2016
Format
Conference Paper
Material
Steel-Timber Composite
Application
Floors
Topic
Mechanical Properties
Keywords
Four Point Bending Test
Long Span
Bending Stiffness
Full Scale
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4341-4351
Summary
The present contribution deals with the theoretical analysis of a selected geometry of CLT-elements combined with steel trapezoidal cross sections with a subsequent description of test specimens and the results of the conducted four-point-bending test. Used for long span floors this hybrid construction can be adjusted in its bending stiffness as needed. By placing the steel part into the tension zone a ductile failure mode can be achieved as well as notching the trapezoidal cross section is applicable easily. By performing full scale four-point-bending-tests of several test specimens it was possible to confirm the theoretical findings.
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Vibrational Behaviour of Cross Laminated Timber Floors in Residential Buildings

https://research.thinkwood.com/en/permalink/catalogue1738
Year of Publication
2016
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Zimmer, Severin
Augustin, Manfred
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Acoustics and Vibration
Keywords
Boundary Conditions
Serviceability Limit State
Elastomers
Frequency
In Situ
Laboratory Tests
Residential
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4835-4844
Summary
This paper will discuss the relevancy of different boundary conditions that relates to the dynamic behaviour of CLT floors to show the opportunities of adopting the findings for the verification of the serviceability limit state. Based on a literature research and measurements in the laboratory and in situ in different objects the evaluated boundary conditions are different static systems, supporting conditions, non-load bearing internal walls, flexible carriers, joints between CLT elements, elastomers and floor constructions. Furthermore a theoretical investigation on the low frequency behaviour of floating screeds was conducted. Abstracted from the results it can be stated that elastomers can generally be neglected in their influence on low frequency vibration modes except when the partial clamping due to the load of superimposed storeys at the supports should be taken into account. The effect of partial clamping on low frequency vibration can be calculated adequately but is lowered if elastomers are used to improve the building physics. A big influence was observed at non-load bearing internal walls as they are able to change the eigenmodes of a floor into ones with higher frequency. Overall the laboratory measurements agreed well with the analytic solutions while differences in comparison of calculations with in situ measurements rise with the complexity of the boundary conditions.
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