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Modal Vibration Testing of an Innovative Timber Structure

https://research.thinkwood.com/en/permalink/catalogue1494
Year of Publication
2016
Topic
Acoustics and Vibration
Material
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Hybrid Building Systems
Author
Leyder, Claude
Frangi, Andrea
Chatzi, Eleni
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Hybrid Building Systems
Topic
Acoustics and Vibration
Keywords
Beech
Post-Tensioned
Modal Vibration Tests
Eigenfrequencies
Damping Ratios
Mode Shapes
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 177-185
Summary
This research paper deals with the evaluation of the dynamic modal vibration tests conducted on an innovative timber structure, the ETH House of Natural Resources. The building serves as a demonstrator of several innovative structural systems and technologies relating to timber. The main load-bearing structure comprises a posttensioned timber frame, which was subjected to modal vibration tests, firstly in the laboratory and, subsequently on the construction site. In this paper, the modal characteristics (eigenfrequencies, damping ratios and mode shapes), obtained from the laboratory testing campaign are presented. The modal vibration data is evaluated using polynomial and subspace identification techniques. The obtained results reveal that the structure exhibits pure translational, beam and column modes, as well as mixed beam-column modes. The bottom connection of the columns delivers significant influence on the modal characteristics, whereas the level of post-tensioning force yields no substantial influence in the modal characteristics obtained from low amplitude modal vibration tests.
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Vibration Response Modelling of Cross Laminated Timber Slabs

https://research.thinkwood.com/en/permalink/catalogue1621
Year of Publication
2016
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Ussher, Ebenezer
Weckendorf, Jan
Smith, Ian
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Acoustics and Vibration
Keywords
Finite Element
Dynamic Response
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 2494-2501
Summary
Innovations in timber engineering have led to new slab systems built from engineered wood products like cross-laminated-timber (CLT). High stiffness of CLT can enable attainment of better vibration performances than is possible with traditional shallow profile-long span floors constructed from timber and other materials. However, realization of this depends on engineers being able to accurately predict effects various construction variables have on dynamic responses of CLT slabs. Past physical experiments have provided insights into those effects. However, testing is a very expensive and time consuming means of acquiring necessary knowledge. Discussion here addresses finite element (FE) simulations as a cost effective method allowing engineers to understand and assess relationships between design variables and dynamic responses of CLT floor slabs. Presented modelling techniques are verified by demonstrating close correlation between numerical predictions and experimental modal response characteristics of CLT slabs.
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Finite Element Modeling for Vibration Transmission in a Cross Laminated Timber Structure

https://research.thinkwood.com/en/permalink/catalogue1633
Year of Publication
2016
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Vardaxis, Nikolaos-Georgios
Hagberg, Klas
Bard, Delphine
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Acoustics and Vibration
Keywords
Sweden
Numerical Model
Finite Element Model
Impact Noise Transmission
Impact Sound
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 2953-2962
Summary
This paper deals with a certain type of C.L.T. (Cross Laminated Timber) construction, in a residential building in Fristad, Sweden. The objective is to study impact noise transmission, at the lower frequency range (10-200 Hz), where wooden dwellings perform inefficiently, in terms of acoustic quality. The vibrational behavior of lightweight structures and specifically a multilayered floor separating two vertically adjacent bedrooms are investigated. A numerical model of the multilayered test plate, which includes sound insulation and vibration isolation layers, is developed using the Finite Element Method (F.E.M.) in commercial software. The design process, the analysis and improvement of the calculated outcome concerning accuracy and complexity are of interest. In situ vibration measurements were also performed so as to evaluate the structures dynamic behavior in reality and consequently the validity of the modelled results. The whole process from design to evaluation is discussed thoroughly, where uncertainties of the complex F.E.M. model and the approximations of the real structure are analyzed. Numerical comparisons are presented including mechanical mobility and impact noise transmission results. The overall aim is to set up a template of calculations that can be used as a prediction tool in the future by the industry and researchers.
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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...
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Full Scale Shake Table Tests on Five Story and Three Story CLT Building Structures

https://research.thinkwood.com/en/permalink/catalogue1670
Year of Publication
2016
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Kawai, Naohito
Miyake, Tatsuya
Yasumura, Motoi
Isoda, Hiroshi
Koshihara, Mikio
Nakajima, Shiro
Araki, Yasuhiro
Nakagawa, Takafumi
Sato, Motoshi
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Full Scale
Shake Table Tests
Japan
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 3828-3835
Summary
The national research project to investigate proper structural design method for CLT (Cross Laminated Timber) buildings has been advanced by the subsidy of the Ministry of Land, Infrastructure, Transport and Tourism of Japan since 2011. This paper provides the outline of shake table tests executed as a part of the project in February 2015. Two specimens, one (Specimen A) is five story and another (Specimen B) is three story, were tested. As the result, for both specimens damage was rather slight by the strong input wave according to the Building Standard Law of Japan. Finally, Specimen A survived three dimensional input wave of 100% of JMA Kobe (strong ground motion recorded during Kobe Earthquake in 1995), and Specimen B survived 140% of JMA Kobe.
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Effects of Wave Transformation in Junctions of Cross-Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue1631
Year of Publication
2016
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Buchegger, Blasius
Ferk, Heinz
Schanz, Martin
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Acoustics and Vibration
Keywords
FEM
Sound Insulation
Sound Reduction Index
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 2895-2903
Summary
A conversion of out-of-plane wave components into in-plane wave components at a junction may lead to increasing values of the flanking sound reduction index. The transformed components may contribute to sound radiation, if a reverse transformation occurs at a second junction during wave propagation. Numerical investigations have been assessed for constructions of cross-laminated-timber to verify this effect and have been compared to equivalent models based on concrete. The results prove the relevance of this effect for typical practical situations.
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Sound Insulation Performance of Elevator Shaft Walls built with Nail-Laminated Timber Panels - Exploratory Tests and Preliminary Results

https://research.thinkwood.com/en/permalink/catalogue364
Year of Publication
2016
Topic
Acoustics and Vibration
Material
NLT (Nail-Laminated Timber)
Application
Shafts and Chases
Author
Pirvu, Ciprian
Organization
FPInnovations
Year of Publication
2016
Country of Publication
Canada
Format
Report
Material
NLT (Nail-Laminated Timber)
Application
Shafts and Chases
Topic
Acoustics and Vibration
Keywords
Building Codes
Canada
Sound Insulation
Apparent Sound Insulation Class
Language
English
Research Status
Complete
Summary
As 6-storey wood-frame, massive-timber and hybrid wood buildings are increasingly accepted by more jurisdictions across Canada, there is a need to develop reliable elevator shaft designs that meet the minimum structural, fire, and sound requirements in building codes. Elevator shaft walls constructed with wood-based materials have the advantages of material compatibility, use of sustainable materials, and ease of construction. In this exploratory study, selected elevator shaft wall designs built with nail-laminated-timber (NLT) structural elements were tested to investigate their sound insulation performance because little is known about the sound insulation performance of such wall assemblies. The tests were carried out in an acoustic mock-up facility in accordance to standard requirements, and provide preliminary data on the sound insulation performance of elevator shaft walls built with NLT panels. Four different elevator shaft walls built with NLT panels were tested and their measured apparent sound insulation class (ASTC) ratings ranged from 18 to 39 depending on their construction details. Some of the reasons that may have contributed to the ASTC ratings obtained for the elevator shaft walls described in this report as well as recommendations for future designs were provided. It is recommended to continue improving the sound insulation of elevator shaft walls built with NLT panels to meet or exceed the minimum requirements in building codes.
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Design Method for Controlling Vibrations of Wood-Concrete Composite Floors Systems

https://research.thinkwood.com/en/permalink/catalogue1689
Year of Publication
2016
Topic
Acoustics and Vibration
Design and Systems
Mechanical Properties
Material
Timber-Concrete Composite
Application
Floors
Author
Hu, Lin
Cuerrier-Auclair, Samuel
Chui, Ying Hei
Ramzi, Redouane
Gagnon, Sylvain
Mohammad, Mohammad
Ni, Chun
Popovski, Marjan
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Timber-Concrete Composite
Application
Floors
Topic
Acoustics and Vibration
Design and Systems
Mechanical Properties
Keywords
Natural Frequencies
Deflection
Bending Stiffness
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4237-4245
Summary
Wood-concrete composite slab floors provide a promising solution for achieving long spans and shallow wood-based floor systems for large and tall wood buildings. In comparison with conventional wood floor systems, such long span and heavy floors have a lower fundamental natural frequency, which challenges the floor vibration controlled design. A laboratory study, including subjective evaluation and measurement of the natural frequencies and one-kN static deflections, was conducted on wood-concrete composite floors. Method of calculation of the composite bending stiffness of the wood-concrete composite floor is proposed. The design criterion for human comfort was derived from the subjective evaluation results using the calculated fundamental natural frequency and 1 kN static deflection of one meter wide strip of the composite floor. The equation to directly determine the vibration controlled spans from the stiffness and mass was derived. Limited verification was performed. Further verification is needed when more field wood-concrete composite floors become available.
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The Use of Cross Laminated Timber for Long Span Flooring in Commercial Buildings

https://research.thinkwood.com/en/permalink/catalogue1739
Year of Publication
2016
Topic
Acoustics and Vibration
Serviceability
Connections
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Lewis, Kirsten
Basaglia, Bella
Shrestha, Rijun
Crews, Keith
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Acoustics and Vibration
Serviceability
Connections
Keywords
Long Span
Australia
New Zealand
Transverse Stiffness
Vibration Performance
Boundary Conditions
Numerical Analysis
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4845-4853
Summary
Long span timber floor solutions have demonstrated their potential to compete with concrete and steel construction for multi-storey commercial buildings. Due to the high strength-to-weight ratio of timber, serviceable vibration performance is a critical structural design issue for long spans. This project investigates the vibration...
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Experimental Study on Air Tone Interruption Performance of CLT Panel Wall

https://research.thinkwood.com/en/permalink/catalogue1802
Year of Publication
2016
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Tanaka, Manabu
Kasai, Yusuke
Murakami, Tsuyoshi
Kawaya, Shoji
Publisher
J-STAGE
Year of Publication
2016
Country of Publication
Japan
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Acoustics and Vibration
Keywords
Sound Transmission
Panels
Experimental Tests
Sound Insulation
Language
Japanese
Research Status
Complete
Series
Japanese Architectural Institute Environmental Papers
ISSN
1881 - 817 X
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Free
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10 records – page 1 of 1.