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Expanding wood use towards 2025: seismic performance of braced mass timber frames, year 2

https://library.fpinnovations.ca/en/permalink/fpipub52921
Author
Chen, Zhiyong
Popovski, Marjan
Date
February 2020
Material Type
Research report
Field
Sustainable Construction
Author
Chen, Zhiyong
Popovski, Marjan
Date
February 2020
Material Type
Research report
Physical Description
40 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Cross Laminated Timber (CLT)
Performance
Building construction
Building materials
Seismic
Series Number
Expanding wood use towards 2025
Language
English
Abstract
Braced timber frames (BTFs) are one of the most efficient structural systems to resist lateral loads induced by earthquakes or high winds. Although BTFs are implemented as a system in the National Building Code of Canada (NBCC), no design guidelines currently exist in CSA O86. That not only leaves these efficient systems out of reach of designers, but also puts them in danger of being eliminated from NBCC. The main objective of this project is to generate the technical information needed for development of design guidelines for BTFs as a lateral load resisting system in CSA O86. The seismic performance of 30 BTFs with riveted connections was studied last year by conducting nonlinear dynamic analysis; and also 15 glulam brace specimens using bolted connections were tested under cyclic loading.
In the second year of the project, a relationship between the connection and system ductility of BTFs was derived based on engineering principles. The proposed relationship was verified against the nonlinear pushover analysis results of single- and multi-storey BTFs with various building heights. The influence of the connection ductility, the stiffness ratio, and the number of tiers and storeys on the system ductility of BTFs was investigated using the verified relationship. The minimum connection ductility for different categories (moderately ductile and limited ductility) of BTFs was estimated.
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Expanding wood use towards 2025: seismic performance of midply shear walls

https://library.fpinnovations.ca/en/permalink/fpipub7699
Author
Chen, Zhiyong
Ni, Chun
Karacabeyli, Erol
Yeh, Borjen
Line, Philip
Date
March 2020
Edition
52949
Material Type
Research report
Field
Sustainable Construction
Author
Chen, Zhiyong
Ni, Chun
Karacabeyli, Erol
Yeh, Borjen
Line, Philip
Contributor
Engineered Wood Assocation (APA)
American Wood Council (AWC)
Date
March 2020
Edition
52949
Material Type
Research report
Physical Description
47 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Cross Laminated Timber (CLT)
Performance
Building construction
Building materials
Seismic
Shear walls
Standards
Series Number
Expanding wood use towards 2025
Language
English
Abstract
Midply shear wall (hereafter Midply), 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 and make it easier to accommodate electrical and plumbing services. In this study, a total of 14 Midply specimens in six wall configurations with different sheathing thicknesses and nail spacing were tested under reversed cyclic loading. Test results showed that Midply has 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 walls. For Midply to use the same seismic force modification factors as standard shear walls, seismic equivalency to standard shear walls in accordance with ASTM D7989 was also conducted. Although Midply has superior lateral load and drift capacities, it does not seem to be as ductile as the standard shear walls at the same over-strength level. Additional testing and dynamic analysis are recommended to address this issue.
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Solutions for uppper mid-rise and high-rise mass timber construction: seismic performance of braced mass timber frames, year 1

https://library.fpinnovations.ca/en/permalink/fpipub52818
Author
Chen, Zhiyong
Popovski, Marjan
Symons, Paul D.
Date
April 2019
Material Type
Research report
Field
Sustainable Construction
Author
Chen, Zhiyong
Popovski, Marjan
Symons, Paul D.
Contributor
Natural Resources Canada. Canadian Forest Service
Date
April 2019
Material Type
Research report
Physical Description
44 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Cross Laminated Timber (CLT)
Performance
Building construction
Building materials
Seismic
Language
English
Abstract
Braced mass timber (MT) frames are one of the most efficient structural systems to resist lateral loads induced by earthquakes or high winds. Although braced frames are presented as a system in the National Building Code of Canada (NBCC), no design guidelines currently exist in CSA O86. That not only leaves these efficient systems out of reach of designers, but also puts them in danger of being eliminated from NBCC. The main objective of this project was to develop the technical information needed for development of design guidelines for braced MT frames as a lateral load resisting system in CSA O86. In the first year of the project, the seismic performance of thirty (30) braced MT frames with riveted connections with various numbers of storeys, storey heights, and bay aspect ratios were studied by conducting non-linear pushover and dynamic time-history analyses. Also, fifteen (15) glulam brace specimens using bolted connections with different slenderness ratios were tested under monotonic and cyclic loading. Results from this multi-year project will form the basis for developing comprehensive design guidelines for braced frames in CSA O86.
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