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Ambient and Forced Vibration Testing and Finite Element Model Updating of a Full-Scale Posttensioned Laminated Veneer Lumber Building

https://research.thinkwood.com/en/permalink/catalogue1103
Year of Publication
2012
Topic
Seismic
Wind
Acoustics and Vibration
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Shear Walls
Author
Worth, Margaret
Omenzetter, Piotr
Morris, Hugh
Year of Publication
2012
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Shear Walls
Topic
Seismic
Wind
Acoustics and Vibration
Keywords
Post-Tensioned
Full Scale
In Situ
Finite Element Model
Dynamic Performance
Conference
New Zealand Society for Earthquake Engineering Conference
Research Status
Complete
Notes
April 13-15, 2012, Christchurch, New Zealand
Summary
The Nelson Marlborough Institute of Technology Arts and Media building was completed in 2011 and consists of three seismically separate complexes. This research focussed on the Arts building as it showcases the use of coupled post-tensioned timber shear walls. These are part of the innovative Expan system. Full-scale, in-situ dynamic testing of the novel building was combined with finite element modelling and updating to obtain an understanding of the structural dynamic performance within the linear range. Ambient testing was performed at three stages during construction and was combined with forced vibration testing for the final stage. This forms part of a larger instrumentation program developed to investigate the wind and seismic response and long term deformations of the building. A finite element model of the building was formulated and updated using experimental modal characteristics. It was shown that the addition of non-structural elements, such as cladding and the staircase, increased the natural frequency of the first mode and the second mode by 19% and 24%, respectively. The addition of the concrete floor topping as a structural diaphragm significantly increased the natural frequency of the first mode but not the second mode, with an increase of 123% and 18%, respectively. The elastic damping of the NMIT building at low-level vibrations was identified as being between 1.6% and 2.4%.
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Free
Resource Link
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Japan Kobe Earthquake Shake Table Simulation – Earthquake Performance of Multi-storey Cross Laminated Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue1849
Year of Publication
2018
Topic
Seismic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Quenneville, Pierre
Morris, Hugh
Publisher
New Zealand Timber Design Society
Year of Publication
2018
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Design and Systems
Keywords
Earthquake
Shake Table Test
Panels
Research Status
Complete
Series
New Zealand Timber Design Journal
Summary
On October 23rd 2007, a seven storey Cross Laminated Timber building was tested on the world’s largest earthquake shake table at Miki near Kobe in Japan. Cross laminated timber construction and the preliminary earthquake and fire tests are overviewed. The huge E-Defense shake table facility in Japan and the test building are described and the earthquake records used to test the building. The building performed well when subjected to the severe Kobe earthquake record. It had some minor softening and no residual deformation. Accelerations measured within the building were large and need further design consideration.
Online Access
Free
Resource Link
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The Long Term Instrumentation of the NMIT Arts Building - Expan Shear Walls

https://research.thinkwood.com/en/permalink/catalogue1857
Year of Publication
2018
Topic
Design and Systems
Material
LVL (Laminated Veneer Lumber)
Application
Walls
Author
Morris, Hugh
Zhu, Maggie
Wang, Michelle
Publisher
New Zealand Timber Design Society
Year of Publication
2018
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Application
Walls
Topic
Design and Systems
Keywords
Multi-Storey
Shear
Post Tensioning
Wall Shortening
Monitoring
Connections
Instrumentation
Research Status
Complete
Series
New Zealand Timber Design Journal
Summary
The NMIT Arts building completed in 2011 in Nelson is the first three storey building using Expan type technology with energy dissipating rocking shear walls constructed from laminated veneer lumber (LVL). The long term wall post tensioning, wall shortening, and concrete composite floor deformations have been evaluated in more detail from April 2011 until October 2011. An overview is given of the building and overall instrumentation systems. Detail is given on the long term instrumentation on-site data logging systems, data transfer, Auckland monitoring equipment, data extraction and development of the web interface. The instrumentation is temperature sensitive but gross variations are predictable and corrected. The data will provide further opportunity to investigate hygro-thermal response. Preliminary results for the rate of compressive deformation were 0.4 to 1.4 mm in five months till mid October 2011 and the post tension loss is between 8 and 14.5 kN over the same five months. The post-tension losses since June 2010 vary from 13.9 to 20.6%.
Online Access
Free
Resource Link
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