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High-Performance Timber Frames with Smart Braces

https://research.thinkwood.com/en/permalink/catalogue2819
Topic
Seismic
Design and Systems
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Organization
University of Northern British Columbia
Country of Publication
Canada
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Topic
Seismic
Design and Systems
Keywords
Braced Frames
Mid-Rise
High-Rise
Research Status
In Progress
Notes
Project contact is Asif Iqbal at the University of British Columbia
Summary
Braced frames are a solution to provide stiffness to buildings to address seismic and wind loads. There is a demand for compact arrangement and efficient lateral load resisting systems. The project examines the applicability of the braced-frame structural system, with respect to seismic forces. Design recommendations will be developed for buildings located in seismic regions such as Vancouver and Victoria. 
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Perforated Plate Testing

https://research.thinkwood.com/en/permalink/catalogue2647
Topic
Seismic
Design and Systems
Connections
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Organization
Fast + Epp
Country of Publication
Canada
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Topic
Seismic
Design and Systems
Connections
Keywords
Braced Frames
Dissipation
Cyclic Tests
Monotonic Test
GCWood
Language
English
Research Status
In Progress
Summary
As part of Fast + Epp’s ongoing work to push the boundaries of Tall Wood construction in seismic zones, this testing program aims to develop a new dissipative system for use in timber braced frames or other timber lateral systems where the connections provide energy dissipation. The connections are designed to dissipate energy through ductile steel plates to provide robust and well understood dissipative systems. In collaboration with the Advanced Research in Timber Systems’ team at the University of Alberta, Fast + Epp is working on a four-phase testing program for cyclic and monotonic testing of various configurations of perforated plate connections. Small scale tests have been completed on perforated plates, and entire connections will be examined in advance of a full-scale timber brace frame test to evaluate the overall behaviour. One phase of physical testing was completed in January 2020, with the next 3 phases intended to be completed in 2021. Initial data analysis of the first phase testing has resulted in tuning of the system in advance of later phase testing. Results on the first two or three phases of testing are anticipated to be completed in 2020 with initial publication of the results in early 2021.
Resource Link
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Solutions for Upper Mid-Rise and High-Rise Mass Timber Construction: Seismic Performance of Braced Mass Timber Frames, Year 1

https://research.thinkwood.com/en/permalink/catalogue2640
Year of Publication
2019
Topic
Seismic
Design and Systems
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Author
Chen, Zhiyong
Popovski, Marjan
Symons, Paul
Organization
FPInnovations
Year of Publication
2019
Format
Report
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Topic
Seismic
Design and Systems
Keywords
Lateral Load
Seismic Performance
Braced Frames
Language
English
Research Status
Complete
Summary
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.
Online Access
Free
Resource Link
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Study of the Seismic Behavior of a Solid Wood Frame Subjected to Cyclic Tests

https://research.thinkwood.com/en/permalink/catalogue2669
Topic
Connections
Seismic
Mechanical Properties
Application
Frames
Organization
Université Laval
Country of Publication
Canada
Application
Frames
Topic
Connections
Seismic
Mechanical Properties
Keywords
Cyclic Tests
Seismic Loading
Energy Dissipation
Braced Frames
Research Status
In Progress
Notes
Project contact is Jean Proulx at Université Laval
Summary
The main objective of the research project is to evaluate the behavior of a column, beam and bracing connection under dynamic stresses. It will therefore be necessary to obtain in the laboratory the properties used for the optimization and the better understanding of a braced frame resistant to lateral forces. The assembly will transfer the lateral loads applied to the structure, to the foundations of a building. The capacity of the frame to dissipate energy under seismic loading will be evaluated by cyclic tests. Any structure must be able to dissipate energy under dynamic loads (earthquakes, wind) and the demand for ductility in assemblies is considerable in braced frame structures. This project will characterize the behavior of beam, column and bracing connections. The results obtained can be used by the partner for the seismic design of solid wood structures using this type of braced frame. Optimization and a better understanding of the dynamic behavior of these assemblies will also increase the safety of solid wood structures, and promote their acceptance in this developing market.
Resource Link
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