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Acoustic Lab Testing of CLT and MPP Wall and Floor Assemblies for Multi-Family Residential Application

https://research.thinkwood.com/en/permalink/catalogue2831
Year of Publication
2019
Topic
Acoustics and Vibration
Serviceability
Material
CLT (Cross-Laminated Timber)
MPP (Mass Plywood Panel)
Application
Walls
Floors
Author
Van Den Wymelenberg, Kevin
Northcutt, Dale
Fretz, Mark
Stenson, Jason
Zagorec-Marks, Ethan
Organization
University of Oregon
Publisher
University of Oregon
Year of Publication
2019
Country of Publication
United States
Format
Report
Material
CLT (Cross-Laminated Timber)
MPP (Mass Plywood Panel)
Application
Walls
Floors
Topic
Acoustics and Vibration
Serviceability
Keywords
Acoustics
Laboratory Tests
Sound Transmission Class
Impact Isolation Class
Insulation
Dry Assembly
Language
English
Research Status
Complete
Summary
Mass timber products are growing in popularity, particularly in multifamily residential dwellings, for which they are structurally well-suited. However, acoustic performance of these products has not been robustly tested, which can be a hindrance to building projects due to lack of code compliance or building performance with poor acoustics. The latter is particularly important since the sound transmission class (STC) rating—a single number used to characterize decibel attenuation—does not characterize an assembly in terms of which frequencies it blocks well or transmits. Wood does a good job of attenuating mid- to high-range frequencies, but not necessarily low ones, such as from a sub-woofer, so testing of assemblies is critical because it elicits their performance in terms of the entire range of frequencies, in addition to defining a single STC rating. This allows for adjustments to be made that balance the acoustic performance of the assembly – such as adding isolation through solutions like air space or concrete topping – with construction cost, sequencing and aesthetics. The other standard acoustic rating, impact insulation class (IIC), accounts for foot-fall and other impact noises and is another critical test for determining code compliance of floor assemblies.
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High Performance CFRP-Timber-Concrete Laminated Composite Members

https://research.thinkwood.com/en/permalink/catalogue1698
Year of Publication
2016
Topic
Mechanical Properties
Material
Timber-Concrete Composite
Application
Beams
Author
Balogh, Jeno
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Timber-Concrete Composite
Application
Beams
Topic
Mechanical Properties
Keywords
Strength
Stiffness
Loading
Short-term
Laboratory Tests
Finite Element Model
Tension
CFRP
Failure Mode
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4352-4359
Summary
This paper deals with laminated timber-concrete (LTC) composite beam members, for applications in sustainable building structures, in which the interlayer connection is achieved with adhesives, similarly to the glued laminated timber beams, instead of the classically used shear connectors (e.g. mechanical connectors or notches). Only a small number of studies of this type of high-performance members are available. The strength and stiffness of the LTC under short-term static ramp-loading were studied on new and retrofit (joist-type) floor members, through laboratory tests and non-linear finite element modelling. In the initial tests the typical failure mode observed was the failure of the wood in tension. Consequently, a carbon fibre reinforced polymer (CFRP) layer was added to the tension side of the timber layer, forming a multi-composite member. The research results indicate that the structural performance in terms of efficiencies and strength for the LTC beams exceeds the corresponding performance of similar classical timber-concrete beams with shear connectors due to the different shear transfer and failure modes. By adding the CFRP reinforcement to the tension fibres of the timber layer, the failure mode changed again, allowing for further increase in strength and stiffness.
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Numerical Analysis and Its Laboratory Verification in Bending Test of Glue Laminated Timber Pre-Cracked Beam

https://research.thinkwood.com/en/permalink/catalogue2426
Year of Publication
2019
Topic
Mechanical Properties
Design and Systems
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Kawecki, Bartosz
Podgórski, Jerzy
Publisher
MDPI
Year of Publication
2019
Country of Publication
Switzerland
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Design and Systems
Keywords
Laboratory Tests
Damage
Finite Element Model
Pine
Softwood
Bonding
Language
English
Research Status
Complete
Series
Materials
Online Access
Free
Resource Link
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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
Country of Publication
Austria
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
Language
English
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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Free
Resource Link
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