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5 records – page 1 of 1.

Design Equations for Embedment Strength of Wood for Threaded Fasteners in the Canadian Timber Design Code

https://research.thinkwood.com/en/permalink/catalogue281
Year of Publication
2014
Topic
Connections
Material
Glulam (Glue-Laminated Timber)
Author
Kennedy, Shawn
Salenikovich, Alexander
Munoz, Williams
Mohammad, Mohammad
Sattler, Derek
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Topic
Connections
Keywords
Dowel Type Fastener
Lateral Resistance
Yielding Resistance
Embedment Strength
Canada
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
The Canadian standard for engineering design in wood (CSA O86) adopted the European yield model for calculations of the lateral resistance of connections with dowel-type fasteners. This model takes into account the yielding resistance of the fastener, the assembly's geometry and the embedment strength of wood. The latter is considered a function of the relative density of wood and diameter of the fastener. The purpose of this study is to verify the significance of these variables as applied to the embedment strength for threaded dowel-type fasteners of diameters 6.4 mm and greater in Canadian glulam products. The importance of this research is justified by the growing interest in the use of large-diameter threaded fasteners in heavy timber and hybrid structures of high load-bearing capacity. Based on the results of 960 tests, a new design model for the embedment strength is proposed for potential implementation in CSA O86 standard and the impact of such a change is presented.
Online Access
Free
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Evaluation of Structural Systems for Mass Timber Buildings in Low to Moderate Seismic Regions

https://research.thinkwood.com/en/permalink/catalogue2391
Year of Publication
2019
Topic
Design and Systems
Seismic
Application
Wood Building Systems
Author
Gleason, Timothy
Publisher
Massachusetts Institute of Technology
Year of Publication
2019
Country of Publication
United States
Format
Thesis
Application
Wood Building Systems
Topic
Design and Systems
Seismic
Keywords
Multi-Family
Multi-Story
Mass Timber
Earthquake
Tall Timber
Lateral Resistance
Language
English
Research Status
Complete
Summary
This paper begins with an overview of the state of the art in the design of multi-story mass timber structures and their lateral systems in low to moderate seismic regions. Boston, MA has been chosen as the location for a feasibility analysis of 8-, 12-, and 18- story mass timber structures. These building prototypes are used to compare the structural and environmental efficiencies and tradeoffs of replacing conventional concrete cores with mass timber braced frames and steel-timber hybrid frames. The lateral resistance of prototype configurations is evaluated through numerical analyses to understand in more detail the characteristics of an efficient mass timber lateral system. Finding an optimal timber gravity system configuration is followed by examining lateral resistance of the prototypes. The resulting designs demonstrate a practical approach to assist designers in selecting a lateral system during the early stages of conceptual design. This research was conducted in parallel with a related study for implementation of mass timber in affordable housing in Boston, enabling a comparison between composite systems and all-timber structures.
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Free
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Examination of the Lateral Resistance of Cross-Laminated Timber in Panel-Panel Connections

https://research.thinkwood.com/en/permalink/catalogue2302
Year of Publication
2015
Topic
Design and Systems
Connections
Material
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems
Author
Richardson, Benjamin Lee
Publisher
Virginia Tech
Year of Publication
2015
Country of Publication
United States
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems
Topic
Design and Systems
Connections
Keywords
Lateral Resistance
Shear Resistance
Full Scale
Panels
Small Scale
Steel Connections
Language
English
Research Status
Complete
Online Access
Free
Resource Link
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Experimental Study on Lateral Resistance of Reinforced Glued-Laminated Timber Post and Beam Structures

https://research.thinkwood.com/en/permalink/catalogue1648
Year of Publication
2016
Topic
Seismic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Xiong, Haibei
Liu, Yingyang
Lam, Frank
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Seismic
Mechanical Properties
Keywords
Cyclic Tests
Full Scale
Reinforcement
Lateral Resistance
Strength
Stiffness
Energy Dissipation
Self-Tapping Screws
FRP
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 3471-3478
Summary
In order to study the lateral resistance of reinforced glued-laminated timber post and beam structures, nine cyclic tests on full-scale one-storey, one-bay timber post and beam construction specimens were carried out. Two reinforcement methods (wrapping fiber reinforced polymer (FRP) and implanting self-tapping screws) and two structural systems (simple frame and knee-braced frame) were considered in the experimental tests. Based on the experimental phenomena and test results, feasibility of the reinforcement was discussed, contribution between different methods was evaluated, and the seismic performances of the specimens were studied. Results showed that both the two reinforcement methods could restrain the development of crack, and recover the strength, stiffness and energy dissipation capacity. It also showed that the lateral resistance could be improved significantly when the failed simple frame retrofitted by reinforcing the joint and adding knee-brace, and this approach can be very practical in engineering.
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Free
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Nonlinear Static Seismic Response of a Building Equipped with Hybrid Cross-Laminated Timber Floor Diaphragms and Concentric X-Braced Steel Frames

https://research.thinkwood.com/en/permalink/catalogue2761
Year of Publication
2021
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Steel-Timber Composite
Application
Floors
Author
Roncari, Andrea
Gobbi, Filippo
Loss, Cristiano
Organization
University of British Columbia
University of Trento
Publisher
MDPI
Year of Publication
2021
Country of Publication
Canada
Italy
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Steel-Timber Composite
Application
Floors
Topic
Seismic
Keywords
Seismic Design
Hybrid Structures
Lateral Resistance
Semi-rigid Diaphragms
Load Distribution
Seismic Performance
Pushover Analysis
Nonlinear Static Analysis
Finite Element Model
Language
English
Research Status
Complete
Series
Buildings
Summary
Simplified seismic design procedures mostly recommend the adoption of rigid floor diaphragms when forming a building’s lateral force-resisting structural system. While rigid behavior is compatible with many reinforced concrete or composite steel-concrete floor systems, the intrinsic stiffness properties of wood and ductile timber connections of timber floor slabs typically make reaching a such comparable in-plane response difficult. Codes or standards in North America widely cover wood-frame construction, with provisions given for both rigid and flexible floor diaphragms designs. Instead, research is ongoing for emerging cross-laminated-timber (CLT) and hybrid CLT-based technologies, with seismic design codification still currently limited. This paper deals with a steel-CLT-based hybrid structure built by assembling braced steel frames with CLT-steel composite floors. Preliminary investigation on the performance of a 3-story building under seismic loads is presented, with particular attention to the influence of in-plane timber diaphragms flexibility on the force distribution and lateral deformation at each story. The building complies with the Italian Building Code damage limit state and ultimate limit state design requirements by considering a moderate seismic hazard scenario. Nonlinear static analyses are performed adopting a finite-element model calibrated based on experimental data. The CLT-steel composite floor in-plane deformability shows mitigated effects on the load distribution into the bracing systems compared to the ideal rigid behavior. On the other hand, the lateral deformation always rises at least 17% and 21% on average, independently of the story and load distribution along the building’s height.
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Free
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