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7 records – page 1 of 1.

Design and Construction of Prestressed Timber Buildings for Seismic Areas

https://research.thinkwood.com/en/permalink/catalogue1847
Year of Publication
2018
Topic
Design and Systems
Material
LVL (Laminated Veneer Lumber)
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Author
Smith, Tobias
Pampanin, Stefano
Fragiacomo, Massimo
Buchannan, Andy
Publisher
New Zealand Timber Design Society
Year of Publication
2018
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Keywords
Pre-Stressed
Low-Rise
Multi-Storey
Earthquake Resistance
Hybrid Structures
Research Status
Complete
Series
New Zealand Timber Design Journal
Summary
This paper describes the structural design of low-rise multi-storey timber buildings using a new and exciting structural system. This system, originally developed for use with pre-cast concrete, combines un-bonded post-tensioning and additional energy dissipaters, providing a recentering capability after the earthquake, while greatly reducing the structural damage. This new structural system can be used in multi-storey buildings, with large structural timber members made from laminated veneer lumber (LVL) or glulam timber, with lateral loads resisted by prestressed timber frames or walls, separately or in combination. A case study of a six storey timber office building in a moderate seismic area is analysed and a virtual design is carried out, allowing investigation of different methods of structural analysis, and development of many construction and connection details for rapid construction. Total building cost is compared to equivalent steel and reinforced concrete options.
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Free
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Design Example: Wood Diaphragm Using Envelope Method

https://research.thinkwood.com/en/permalink/catalogue2613
Year of Publication
2013
Topic
Design and Systems
Material
Glulam (Glue-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Shear Walls
Author
Neylon, B.
Wang, Jasmine
Ni, Chun
Organization
FPInnovations
Year of Publication
2013
Format
Report
Material
Glulam (Glue-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Shear Walls
Topic
Design and Systems
Keywords
Shear
Diaphragm
Low-Rise
Commercial
Research Status
Complete
Summary
This building is a typical one-storey commercial building located in Vancouver, BC. The plan dimensions are 30.5 m x 12.2 m (100’ x 40’), with a building height of 5 m. The walls are wood-based shear walls, with a wood diaphragm roof and a steel moment frame at the storefront. The roof plan is shown in Figure 1. The site is Seismic Class ‘C’. Wind, snow and seismic figures specific to the project location are taken from the current version of the British Columbia Building Code (2012). Roof dead load is assumed to be 1.0 kPa and the wall weight is 0.5 kPa. The weight of non-structural items including mechanical equipment and the storefront façade has not been included in this example for simplicity.
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Free
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Ductile Cross Laminated Timber (CLT) Platform Structures with Passive Damping

https://research.thinkwood.com/en/permalink/catalogue1728
Year of Publication
2016
Topic
Seismic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Hashemi, Ashkan
Loo, Wei Yuen
Masoudnia, Reza
Zarnani, Pouyan
Quenneville, Pierre
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Mechanical Properties
Keywords
Low-Rise
Numerical Model
Reverse Cyclic Loading
Quasi-Static
Simulation
Strength
Slip
Platform Buildings
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4730-4737
Summary
Multi-storey platform cross laminated timber (CLT) structures are becoming progressively desirable for engineers and owners. This is because they offer many significant advantages such as speed of fabrication, ease of construction, and excellent strength to weight ratio. With platform construction, stories are fixed together in a way that each floor bears into load bearing walls, therewith creating a platform for the next level. The latest research findings have shown that CLT platform buildings constructed with traditional fasteners can experience a high level of damage especially in those cases where the walls have adopted hold-down brackets and shear connectors with nails, rivets or screws. Thus, the current construction method for platform CLT structures is less than ideal in terms of damage avoidance. The main objective of this study is to develop a low damage platform timber panelised structural system using a new configuration of slip friction devices in lieu of traditional connectors. A numerical model of such a system is developed for a low rise CLT building and then is subjected to reversed cyclic load simulations in order to investigate its seismic performance. The result of these quasi-static simulations demonstrated that the system maintained the strength through numerous cycles of loading and unloading. In addition to this, the system is capable of absorbing significant amount of energy. The findings of this study demonstrate the proposed concept has the potential to be developed as a low damage seismic solution for CLT platform buildings.
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Free
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Hygrothermal Conditions in Cross Laminated Timber (CLT) Dwellings

https://research.thinkwood.com/en/permalink/catalogue2705
Year of Publication
2020
Topic
Moisture
Energy Performance
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Tingstveit, Merethe
Nielsen, Henrik
Risholt, Birgit
Year of Publication
2020
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Moisture
Energy Performance
Keywords
Hygrothermal
Low-Rise
Residential
Moisture Content
Relative Humidity
Indoor Air Temperature
Conference
Nordic Symposium on Building Physics
Research Status
Complete
Summary
The use of CLT has been increasing the last decade, and a subsequently focus on documentation of the accompanying indoor climate and exposed wooden surfaces on human well-being. This study presents the results of a measurement campaign conducted over one year of a CLT apartment building in Grimstad, Norway. The apartment building consists of three floors with 35 apartments and comply with the Norwegian passive house standard and energy grade A. Measurements of the relative humidity (RH), indoor air temperature and wood moisture content (MC) were performed in the exposed CLT spruce panels in three apartments in two different floors. The results from the three apartments show a relatively small variation in the MC values regardless the residents behavior measured as RH variation through a complete year. Selected periods from a cold period (winter) and a warm period (summer) show the variation in relative humidity (RH) and moisture content in the CLT element. However, results from control measurements showed higher MC values. The gap between the measurements and methods are discussed.
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Free
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Improving Thermal Efficiency in Lightweight Construction: Mass Timber as Thermal Mass

https://research.thinkwood.com/en/permalink/catalogue1915
Year of Publication
2016
Topic
Energy Performance
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Ceilings
Roofs
Author
Dewsbury, Mark
Publisher
Forest & Wood Products Australia
Year of Publication
2016
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Ceilings
Roofs
Topic
Energy Performance
Keywords
Thermal Efficiency
Lightweight
Low-Rise
Mid-Rise
Low-Energy
Research Status
Complete
Series
Market Access, Project Number: PNA289-1213a
Summary
The research aimed to obtain new data to inform opportunities to further improve the thermal efficiency of light-weight, timber framed, small to medium scaled buildings. The principle task of this project was to complete an empirical study assessing the measured thermal performance of mass-timber. This empirical study, within real buildings, could then be used to corroborate previous published building heating and cooling energy simulations, which had shown significant thermal performance benefit when mass-timber was substituted with standard framed systems, and concrete and clay brick thermal mass systems. In the evolving world of increased building regulation and an increasing market expectation for low energy homes there is a need to clearly and simply show how the renewable Australian timber resource can be used to provide thermally comfortable housing, whether they be located in the hot and humid climates of the North or the cooler Southern temperate climates.
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Free
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(Mass) Timber: Structurally Optimized Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue1433
Year of Publication
2016
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Strobel, Kristen
Organization
University of Washington
Year of Publication
2016
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Keywords
Office Buildings
Low-Rise
Mid-Rise
High-Rise
Research Status
Complete
Summary
This thesis explores the challenges and potential of mass timber as a paradigm shifting technology for the building industry through the application of parametric modeling technology to the design of office buildings. By testing building configurations in three zoning envelopes—low-rise suburban, mid-rise urban, and high-rise urban—optimization strategies for mass timber office buildings were developed. Facades and floor slabs were identified as the primary contributors to building cost and environmental impacts and therefore the easiest targets for optimization. The primary method for optimizing facades is replacing curtain wall with solid cross laminated timber (CLT) walls, this method runs counter to developer driven standards of fully glazed facades making short term adoption of this strategy unlikely without major shifts in building developer and owner expectations. Slabs and floor systems can be optimized through the implementation of novel solutions that take advantage of composite action between glulam, CLT, and concrete elements. Additionally, zoning height incentives could be used to make timber construction competitive with steel and concrete systems despite increased floor-to-floor heights. Finally, future research opportunities and needs, both architectural and technical, are identified.
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Free
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Numerical Study of Pin-Supported Cross-Laminated Timber (CLT) Shear Wall System Equipped with Low-Yield Steel Dampers

https://research.thinkwood.com/en/permalink/catalogue1267
Year of Publication
2016
Topic
Seismic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Shear Walls
Author
Ma, Siyao
Organization
University of British Columbia
Year of Publication
2016
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Shear Walls
Topic
Seismic
Design and Systems
Keywords
Low-Rise
Mid-Rise
Rocking Walls
Steel Dampers
Research Status
Complete
Summary
This thesis presents a numerical study of a novel rocking cross-laminated timber (CLT) shear wall system for low- to mid-rise constructions. The system takes advantage of the high in-plane stiffness of CLT coupled with low-yield steel dampers to control the rocking motion of the CLT shear walls during earthquakes. The low-yield steel dampers connected between two rigid CLT wall panels provide the mechanism needed to dissipate the earthquake energy. This concentrates the damage in the dampers, allowing the system to be repaired efficiently after major earthquakes. Numerical models of the CLT shear wall system have been developed using both OpenSees Navigator and ABAQUS software. Models of low-yield steel damper systems were calibrated using available experimental results. With the rigid floor/roof assumption, a simplified OpenSees model of the CLT shear wall system was demonstrated to be effective and reasonably accurate in predicting the response of the system under large excitations. Therefore, it is efficient and reliable to apply the OpenSees model to study the seismic response of CLT shear wall buildings. A case study of a six-storey CLT shear wall building located in Vancouver, Canada was studied; and, detailed parameteric studies were conducted to investigate the influences of the damper type (damper shear strength), number of dampers, damper location, different earthquake records versus target earthquake design response spectrum, and earthquake peak ground acceleration (PGA) on the building response. It was determined that an optimized damper design with comprehensive consideration of these five factors can provide a building with a small roof drift ratio, as well as minor damages on the dampers. Concepts and examples for connection design are also provided.
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Free
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7 records – page 1 of 1.