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203 records – page 1 of 11.

Advancing Knowledge of Mid-ply Shear Walls: Mid-Ply Shear Wall Fire Resistance Testing

https://research.thinkwood.com/en/permalink/catalogue2808
Year of Publication
2021
Topic
Fire
Material
Light Frame (Lumber+Panels)
Application
Shear Walls
Author
Ranger, Lindsay
Dagenais, Christian
Organization
FPInnovations
Year of Publication
2021
Country of Publication
Canada
Format
Report
Material
Light Frame (Lumber+Panels)
Application
Shear Walls
Topic
Fire
Keywords
Shear Walls
Fire Resistance Rating
Mid-Rise
Midply Wall
Language
English
Research Status
Complete
Summary
The objective of this research is to address a knowledge gap related to fire performance of midply shear walls. Testing has already been done to establish the structural performance of these assemblies. To ensure their safe implementation and their broad acceptance, this project will establish fire resistance ratings for midply shear walls. Fire tests will provide information for the development of design considerations for midply shear walls and confirm that they can achieve at least 1-hour fire-resistance ratings that are required for use in mid-rise buildings. This research will support greater adoption of mid-rise residential and non-residential wood-frame construction and improve competition with similar buildings of noncombustible construction. This work will also support the development of the APA system report for midply walls, which will be a design guideline for using midply walls in North America.
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Free
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On the distribution of internal forces in single-storey CLT symmetric shear-walls with openings

https://research.thinkwood.com/en/permalink/catalogue2850
Year of Publication
2021
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Casagrande, Daniele
Fanti, Riccardo
Greco, Marco
Gavric, Igor
Polastri, Andrea
Organization
Institute of Bioeconomy - National Research Council of Italy
University of Trento
University of Primorska
Publisher
Elsevier
Year of Publication
2021
Country of Publication
Italy
Slovenia
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Mechanical Properties
Keywords
Shear Walls
Openings
Stress Distribution
Finite Element Modeling
Language
English
Research Status
Complete
Series
Structures
Summary
This paper presents a numerical and analytical study on single-storey cross-laminated timber (CLT) shear-walls with openings subjected to lateral loads. The main objective was to investigate the location and distribution of maximum values of axial and shear forces in relevant wall sections. The influence of parameters such as wall geometry (different sizes of wall openings, door openings, lintel/parapet lengths and heights, wall thickness) and different stiffness levels of mechanical anchors for CLT wall connection with floor/foundation were studied. Finite element (FE) parametric analyses were performed on a set of single-storey CLT shear-walls with door and window openings and were compared with analytical models for determination of internal forces. The importance of wall connections’ flexibility was identified, as the distribution of internal forces in walls with rigid and flexible anchors were considerably different. The obtained outcomes of this study provide a solid base for the next step, an experimental investigation of in-plane internal force distribution in CLT walls with openings, which will serve for further development of numerical, analytical and design approaches.
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Free
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Lateral resistance of mass timber shear wall connected by withdrawal-type connectors

https://research.thinkwood.com/en/permalink/catalogue2847
Year of Publication
2021
Topic
Connections
Seismic
Mechanical Properties
Material
Other Materials
Application
Shear Walls
Author
Pang, Sung-Jun
Ahn, Kyung-Sun
Kang, Seog Goo
Oh, Jung-Kwon
Organization
Seoul National University
Publisher
SpringerOpen
Year of Publication
2021
Country of Publication
Korea
Format
Journal Article
Material
Other Materials
Application
Shear Walls
Topic
Connections
Seismic
Mechanical Properties
Keywords
Ply-lam
Shear Walls
Lateral Resistance
Kinematic Model
Language
English
Research Status
Complete
Series
Journal of Wood Science
Summary
In this study, the lateral resistances of mass timber shear walls were investigated for seismic design. The lateral resistances were predicted by kinematic models with mechanical properties of connectors, and compared with experimental data. Four out of 7 shear wall specimens consisted of a single Ply-lam panel and withdrawal-type connectors. Three out of 7 shear wall specimens consisted of two panels made by dividing a single panel in half. The divided panels were connected by 2 or 4 connectors like a single panel before being divided. The applied vertical load was 0, 24, or 120 kN, and the number of connectors for connecting the Ply-lam wall-to-floor was 2 or 4. As a result, the tested data were 6.3 to 52.7% higher than the predicted value by kinematic models, and it means that the lateral resistance can be designed by the behavior of the connector, and the prediction will be safe. The effects of wall-to-wall connectors, wall-to-floor connectors and vertical loads on the shear wall were analyzed with the experimental data.
Online Access
Free
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Expanding wood use towards 2025: seismic performance of midply shear walls, year 2

https://research.thinkwood.com/en/permalink/catalogue2917
Year of Publication
2021
Topic
Seismic
Material
Other Materials
Application
Shear Walls
Author
Ni, Chun
Chen, Zhiyong
Organization
FPInnovations
Year of Publication
2021
Country of Publication
Canada
Format
Report
Material
Other Materials
Application
Shear Walls
Topic
Seismic
Keywords
Sheathing Thickness
Nail Spacing
Lateral Load Capacity
Drift Capacity
Energy Dissipation Capacity
Language
English
Research Status
Complete
Summary
Midply shear wall, which was originally developed by researchers at Forintek Canada Corp. (predecessor of FPInnovations) and the University of British Columbia, is a high-capacity shear wall system that is suitable for high wind and seismic loadings. Its superior seismic performance was demonstrated in a full-scale earthquake simulation test of a 6-storey wood-frame building in Japan. In collaboration with APA–The Engineered Wood Association and the American Wood Council (AWC), a new framing arrangement was designed in this study to increase the vertical load resistance of midply shear walls and make it easier to accommodate electrical and plumbing services. In this study, a total of 12 midply shear wall specimens in four wall configurations with different sheathing thicknesses and nail spacing were tested under reversed cyclic loading. Test results showed that the modified midply shear walls have approximately twice the lateral load capacity of a comparable standard shear wall. The drift capacity and energy dissipation capability are also greater than comparable standard shear wall. Seismic equivalency to standard shear walls in accordance with ASTM D7989 was also conducted. Results show that an overstrength factor of 2.5 and can be used to assign allowable design strengths of midply shear walls with 7/16” and nail spacing at 4” or 3” on center. For midply shear walls with 19/32” OSB, a higher overstrength factor must be used to meet the ductility criteria. The information from this study will support code implementation of the midply shear walls in Canadian and US timber design standards, thereby providing more design options for light wood frame structures in North America.
Online Access
Free
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The role of the hold-down in the capacity model of LTF and CLT shear walls based on the experimental lateral response

https://research.thinkwood.com/en/permalink/catalogue2849
Year of Publication
2021
Topic
Mechanical Properties
Connections
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Shear Walls
Author
Aloisio, Angelo
Boggian, Francesco
Tomasi, Roberto
Fragiacomo, Massimo
Organization
Università degli Studi dell'Aquila
University of Trento
Norwegian University of Life Science
Publisher
Elsevier
Year of Publication
2021
Country of Publication
Italy
Norway
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Shear Walls
Topic
Mechanical Properties
Connections
Keywords
Hold-Down
Rocking
Cyclic Response
Shear Walls
Light-frame wood
Language
English
Research Status
Complete
Series
Construction and Building Materials
Summary
Cross Laminated Timber (CLT) and Light Timber Frame (LTF) shear walls are widespread constructive technologies in timber engineering. Despite the intrinsic differences, the lateral response of the two structural systems may be quite similar under specific connection layouts, boundary constraints, and size of the shear walls. This paper compares the experimental cyclic responses of CLT and LTF shear walls characterized by the same size 250×250cm, and loaded according to the EN 12512 protocol. The rigid-body rotation of the shear walls prevails over the deformation and rigid-body translation in the post-elastic displacement range. As a consequence, a capacity model of the two systems based on the sole hold-down response accurately seizes the observed cyclic response, despite ignoring the other resisting contributions. The authors examine the differences exhibited by the CLT and LTF shear walls and the related error corresponding to a capacity model based on the sole hold down restraints. Additionally, it is assessed the overstrength of the CLT panel and LTF sheathing to the shear walls collapse due to the hold-down failure. The estimated overstrength factor is the most meaningful difference between the two structural systems in the considered experimental layouts.
Online Access
Free
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Cross Laminated Timber Shear Wall Connections for Seismic Applications

https://research.thinkwood.com/en/permalink/catalogue2405
Year of Publication
2020
Topic
Connections
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Falk, Michael
Publisher
Kansas State University
Year of Publication
2020
Country of Publication
United States
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Connections
Seismic
Keywords
Panels
Earthquake
Rocking Walls
Shear Walls
Language
English
Research Status
Complete
Online Access
Free
Resource Link
Less detail

Cross Laminated Timber Shear Wall Connections for Seismic Applications

https://research.thinkwood.com/en/permalink/catalogue2406
Year of Publication
2020
Topic
Connections
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Falk, Michael
Publisher
Kansas State University
Year of Publication
2020
Country of Publication
United States
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Connections
Seismic
Keywords
Panels
Earthquake
Rocking Walls
Shear Walls
Language
English
Research Status
Complete
Online Access
Free
Resource Link
Less detail

Combination of Steel Plate Shear Walls and Timber Moment Frames for Improved Seismic Performance

https://research.thinkwood.com/en/permalink/catalogue2735
Year of Publication
2020
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Frames
Author
Iqbal, Asif
Todorov, Borislav
Billah, Muntasir
Year of Publication
2020
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Frames
Topic
Seismic
Keywords
Timber Moment Frames
Steel Plate Shear Walls
Hybrid
Seismic Performance
Interstory Drifts
Language
English
Conference
World Conference on Earthquake Engineering
Research Status
Complete
Summary
Recent interests in adopting sustainable materials and developments in construction technology have created a trend of aiming for greater heights with timber buildings. With the increased height these buildings are subjected to higher level of lateral load demand. A common and efficient way to increase capacity is to use shearwalls, which can resist significant part of the load on the structures. Prefabricated mass timber panels such as those made of Cross-Laminated Timber (CLT) can be used to form the shearwalls. But due to relatively low stiffness value of timber it is often difficult to keep the maximum drifts within acceptable limit prescribed by building codes. It becomes necessary to either increase wall sizes to beyond available panel dimensions or use multiple or groups of walls spread over different locations over the floor plan. Both of the options are problematic from the economic and functional point of view. One possible alternative is to adopt a Hybrid system, using Steel Plate Shear Walls (SPSW) with timber moment frames. The SPSW has much higher stiffness and combined with timber frames it can reduce overall building drifts significantly. Frames with prefabricated timber members have considerable lateral load capacity. For structures located in seismic regions the system possesses excellent energy dissipation ability with combination of ductile SPSW and yielding elements within the frames. This paper investigates combination of SPSW with timber frames for seismic applications. Numerical model of the system has been developed to examine the interaction between the frames and shear walls under extreme lateral load conditions. Arrangements of different geometries of frames and shear walls are evaluated to determine their compatibility and efficiency in sharing lateral loads. Recommendations are presented for optimum solutions as well as practical limits of applications.
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Technical Guide for Evaluation of Seismic Force Resisting Systems and Their Force Modification Factors for Use in the National Building Code of Canada with Concepts Illustrated Using a Cantilevered Wood CLT Shear Wall Example

https://research.thinkwood.com/en/permalink/catalogue2804
Year of Publication
2021
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
DeVall, Ron
Popovski, Marjan
McFadden, Jasmine
Organization
National Research Council Canada, Canadian Construction Materials Centre
Publisher
National Research Council Canada
Year of Publication
2021
Country of Publication
Canada
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Seismic
Keywords
Seismic Force Resisting System
Force Modification Factor
Ductility Factor
Overstrength
Non-linear Dynamic Analysis
National Building Code of Canada
Alternative Design Solution
Shear Walls
Language
English
Research Status
Complete
ISBN
978-0-660-39263-9
Summary
The objective of this guideline is to provide a simple, systematic, and sufficient procedure for evaluating the performance of Seismic Force Resisting Systems (SFRSs) and to determine the appropriate ductilityrelated (Rd) and over-strength related (Ro) force modification factors for implementation in the National Building Code of Canada (NBC). The procedure relies on the application of non-linear dynamic analysis for quantification of the seismic performance of the SFRS. Note that the procedure is also suitable for assessing force modification factors (RdRo values) of systems already implemented in the NBC. The audience for this guideline are those (called the “project study team” in this document) who submit proposals for new SFRSs with defined RdRo values to the NBC for inclusion in Subsection 4.1.8., Earthquake Loads and Effects, of Division B of the NBC. This guideline can also be used by a team performing an alternative design solution for a specific project and seeking acceptance from authority having jurisdiction. In such cases, not all aspects of this guideline (e.g., having different archetypes) will be needed.
Online Access
Free
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Seismic Reliability Assessment of Mid- and High-rise Post-tensioned CLT Shear Wall Structures

https://research.thinkwood.com/en/permalink/catalogue2508
Year of Publication
2020
Topic
Seismic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Sun, Xiaofeng
Li, Zheng
He, Minjuan
Publisher
KoreaScience
Year of Publication
2020
Country of Publication
Korea
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Seismic
Design and Systems
Keywords
Post-Tensioned Timber
Seismic Reliability
Fragility Analysis
Response Surface Method
Multi-Storey
Tall Timber
Language
English
Research Status
Complete
Series
International Journal of High-Rise Buildings
Online Access
Free
Resource Link
Less detail

Lateral Performance of Cross-laminated Timber Shear Walls: Analytical and Numerical Investigations

https://research.thinkwood.com/en/permalink/catalogue2425
Year of Publication
2019
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Walls

Cross-Laminated Timber Shear Walls in Balloon Construction: Seismic Performance of Steel Connections

https://research.thinkwood.com/en/permalink/catalogue2413
Year of Publication
2019
Topic
Seismic
Connections
Material
CLT (Cross-Laminated Timber)
Application
Walls

Structural Design and Modelling Method for the Post-Tensioned CLT Shear Wall Structures

https://research.thinkwood.com/en/permalink/catalogue2149
Year of Publication
2019
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Walls

Numerical Model and Optimization for Cross-laminated Timber – Light Frame Wood Shear Walls Hybrid System

https://research.thinkwood.com/en/permalink/catalogue2416
Year of Publication
2019
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Wood Building Systems

Interlocking Shear Wall Connections

https://research.thinkwood.com/en/permalink/catalogue2076
Year of Publication
2018
Topic
Connections
Mechanical Properties
Material
Timber-Concrete Composite
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Hybrid Building Systems

Deflection of CLT Shear Walls in Platform Construction

https://research.thinkwood.com/en/permalink/catalogue1974
Year of Publication
2018
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems

Strength and Stiffness of CLT Shear Walls in Platform Construction

https://research.thinkwood.com/en/permalink/catalogue1976
Year of Publication
2018
Topic
Design and Systems
Connections
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems

In-Plane Strength and Stiffness of Cross-Laminated Timber Shear Walls

https://research.thinkwood.com/en/permalink/catalogue2180
Year of Publication
2018
Topic
Mechanical Properties
Connections
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Walls

In-Plane Strength and Stiffness of Cross-Laminated Timber Shear Walls

https://research.thinkwood.com/en/permalink/catalogue2117
Year of Publication
2018
Topic
Design and Systems
Connections
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Walls
Floors

Solutions for Upper Mid-Rise and High-Rise Mass Timber Construction: Numerical Models for Post-Tensioned Shear Wall System with Energy Dissipators

https://research.thinkwood.com/en/permalink/catalogue2601
Year of Publication
2019
Topic
Design and Systems
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Chen, Zhiyong
Popovski, Marjan
Organization
FPInnovations
Year of Publication
2019
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Design and Systems
Seismic
Keywords
Pres-Lam
Seismic Design
Earthquake
Language
English
Research Status
Complete
Summary
The latest developments in seismic design philosophy in modern urban centers have moved towards the development of new types of so called “resilient” or “low damage” structural systems. Such systems reduce the damage to the structure during an earthquake while offering the same or higher levels of safety to occupants. One such structural system in mass timber construction is the “Pres-Lam” system developed by Structural Timber Innovation Company (STIC) and Prestressed Timber Limited (PTL), both from New Zealand. FPInnovations has acquired the Intellectual Property rights for the Pres-Lam system for use in Canada and the United States.
Online Access
Free
Resource Link
Less detail

203 records – page 1 of 11.