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9 records – page 1 of 1.

Advanced Topics in Seismic Analysis and Design of Mid-Rise Wood-Frame Structures

https://research.thinkwood.com/en/permalink/catalogue1773
Year of Publication
2016
Topic
Design and Systems
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Author
Ni, Chun
Popovski, Marjan
Wang, Jasmine
Karacabeyli, Erol
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Topic
Design and Systems
Keywords
Mid-Rise
Dynamic Analysis
Deflection
Diaphragm
National Building Code of Canada
Capacity-Based Design
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 5343-5351
Summary
The following topics in the field of seismic analysis and design of mid-rise (5- and 6-storey) wood-frame buildings are included in this paper: Determination of the building period, linear dynamic analysis of wood-frame structures, deflections of stacked multi-storey shearwalls, diaphragm classification, capacity-based design for woodframe...
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An Approach to CLT Diaphragm Modeling for Seismic Design with Application to a U.S. High Rise Project

https://research.thinkwood.com/en/permalink/catalogue1671
Year of Publication
2016
Topic
Seismic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Floors
Wood Building Systems
Author
Breneman, Scott
McDonnell, Eric
Zimmerman, Reid
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Wood Building Systems
Topic
Seismic
Design and Systems
Keywords
US
Diaphragm
Model
High-Rise
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 3844-3852
Summary
A candidate CLT diaphragm analysis model approach is presented and evaluated as an engineering design tool motivated by the needs of seismic design in the United States. The modeling approach consists of explicitly modeling CLT panels as discrete orthotropic shell elements with connections between panels and connections from panels to structural framing modelled as two-point springs. The modeling approach has been compared to a developed CLT diaphragm design example based on U.S. standards showing the ability to obtain matching deflection results. The sensitivity of the deflection calculations to considering CLT panel-to-panel connection gap closure is investigated using a simple diaphragm example. The proposed modeling approach is also applied to the candidate floor diaphragm design for the Framework project, one of the two U.S. Tall Wood Building Prize Competition winners, currently under design. Observations from this effort are that the proposed method, while a more refined model than typically used during building design, shows promise to meet the needs of innovative CLT seismic designs where appropriate simpler diaphragm models are not available.
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An Approach to CLT Diaphragm Modeling for Seismic Design with Application to a U.S. High-Rise Project

https://research.thinkwood.com/en/permalink/catalogue1710
Year of Publication
2017
Topic
Design and Systems
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Floors

Comparison of the Seismic Performance of Different Hybrid Timber-Steel Frame Configurations

https://research.thinkwood.com/en/permalink/catalogue1775
Year of Publication
2016
Topic
Seismic
Design and Systems
Application
Hybrid Building Systems
Shear Walls
Author
Marin, Jose Alberto
He, Minjuan
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Application
Hybrid Building Systems
Shear Walls
Topic
Seismic
Design and Systems
Keywords
Finite Element Model
Timber-Steel Hybrid
Deformation
Lateral Loading
Abaqus
Displacement
Inter-Story Drift
Diaphragm
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 5401-5408
Summary
This paper presents a finite element modeling case study of three different designs of hybrid timber-steel 6-story buildings. One of the buildings is composed by steel frames and timber diaphragms while the other two cases consist of the initial design with timber shear walls added in different dispositions, one with outer walls and the other...
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Design and Performance of High-Rise Structure using Ultra-Lightweight Cross Laminated Timber Floor System

https://research.thinkwood.com/en/permalink/catalogue2698
Year of Publication
2020
Topic
Mechanical Properties
Serviceability
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Ahmed, Danish
Ayadat, Tahar
Asiz, Andi
Publisher
ISEC Press
Year of Publication
2020
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Mechanical Properties
Serviceability
Keywords
Tall Timber Buildings
Lateral Load
Lateral Deflections
Floor Diaphragm
Language
English
Conference
International Structural Engineering and Construction Conference
Research Status
Complete
Series
Proceedings of International Structural Engineering and Construction
Summary
The main objective of this paper is to study the structural performance of a high-rise structure when alternative lightweight material known as cross-laminated timber was used as a slab in floor system in lieu of conventional reinforced concrete slab. A numerical case study was conducted using a highly irregular RC frame building with its two 60-story towers joined at the top. Three major analyses were considered. First, modeling and analyzing the building with an RC slab was conducted to determine the design reference. Second, substituting the RC slab with the CLT slab was performed using the same building skeleton. Third, redesigning and optimizing the building skeleton with that CLT to observe skeleton material saving obtained using the same structural performance criteria. Major lateral loads applicable in the Eastern Province of Saudi Arabia were inputted. Strengths and serviceability requirements for floor diaphragm and lateral load resisting system were checked first before performing a comparative analysis between traditional RC and CLT slabs as floor diaphragm. The structural performance criteria to be used for comparative study between RC and CLT slabs included total drift, inter-story drift due to lateral loads, and base reactions. Structural periods and acceleration responses for each floor were investigated and contrasted with the existing building code. The foundation demand was also investigated based on the structural weight and reactions generated from the RC and CLT floor systems.
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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
Language
English
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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Effects of Moisture Intrusion on the Performance of a Cross-Laminated Timber (CLT) Angle Bracket Connection

https://research.thinkwood.com/en/permalink/catalogue2703
Year of Publication
2020
Topic
Connections
Moisture
Material
CLT (Cross-Laminated Timber)
Author
Bora, Shrenik
Publisher
Oregon State University
Year of Publication
2020
Country of Publication
United States
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Topic
Connections
Moisture
Keywords
Shear Walls
Wall-to-Diaphragm L-Bracket Connection
High Moisture Exposure Conditions
Moisture Cycling
Language
English
Research Status
Complete
Summary
Cross-laminated timber (CLT) is revolutionizing the use of wood in the construction sector of North America as a solution for walls and diaphragms in mid-rise or even high-rise timber structures on account of its environmental advantages, high strength-to- weight ratio, fire-safety performance, and propensity for prefabrication. However, considering the hygroscopic nature of wood, moisture intrusion can affect material properties and, moreover, moisture increases the possibility of biological degradation, which can directly affect the durability of CLT structural members and their connections. The favorable seismic performance of connections in the CLT structural systems has been well researched in numerous studies. In addition, even though several research efforts have been conducted to understand the hygrothermal performance of CLT panels, knowledge of the CLT connections when subjected to moisture cycling is minimal. In this study, a CLT shear wall-to-diaphragm L-bracket connection is exposed to two high moisture exposure conditions - flood and simulated rain with increased humidity as well as different exposure durations to investigate the connection performance under the effects of moisture intrusion. Currently, there are four major species that are used for CLT, namely, Douglas-fir, Southern yellow pine, Norway spruce, and Spruce Pine Fir. All four species were incorporated into the study. A total of 264 cyclic tests were performed on wall-to-diaphragm L-bracket connection specimens to evaluate the connection performance in terms of strength, stiffness, and energy dissipation along with the development of two force-displacement engineering models. Results from both exposure studies suggest no significant degradation in connection performance after a moisture cycle of wetting and drying apart from a significant decrease in energy dissipation in flood exposure. However, the effects of multiple moisture cycling merit further study.
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Monotonic and Cyclic Testing of Cross-Laminated Timber Diaphragms

https://research.thinkwood.com/en/permalink/catalogue2712
Year of Publication
2020
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Beairsto, Cody
Publisher
Oregon State University
Year of Publication
2020
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Diaphragm
In-Plane Tests
Monotonic Test
Cyclic Tests
Language
English
Research Status
Complete
Summary
Mass timber is emerging as a viable form of construction around the world in new markets for wood buildings. The entrance into these markets has driven the demand for more knowledge to enable designs alongside other structural materials such as steel and reinforced concrete. Large, in-plane tests on cross-laminated timber (CLT) diaphragms (4570 mm x 4570 mm [15 ft x 15 ft]) are used to quantify ductility through the diaphragm force reduction factor (Rs) from ASCE 7-16, m-factors from ASCE 41-17, and validate common methodologies of mass timber design currently implemented in structural engineering practice. The tests demonstrate that cross-laminated timber can function well as a diaphragm with a mean Rs value of 1.19 at indicate a ductility like precast concrete diaphragms with R_s=0.7-1.4. Like precast concrete systems, cross-laminated timber diaphragms depend heavily on the inter-panel connections for a ductile design and will require several categories to classify the types of CLT systems. Analysis methods from ASTM E455 validate the assumptions that a CLT diaphragm is shear-controlled in its behavior for purposes of determining Rs. M-factors are an indirect measurement of the nonlinear deformation capacity of a component and are used as a multiplier to the expected strength of a component. The m-factors observed (0.46 to 1.9 for Immediate Occupancy to Collapse Protection performance levels, respectively) resulted in lower than values from previous studies on similar panel-to-panel connections. The initial stiffness of the large diaphragm panel-to-panel connections, 6.86 kN/mm (39.8 kip/in), were lower than the spline stiffness estimates of 11.5 kN/mm (65.7 kip/in) based on individual fastener tests. The hysteretic loading resulted in lower spline stiffnesses 4.37 kN/mm (24.9 kip/in) while the monotonic testing showed a mean spline stiffness of 9.04 kN/mm (52.5 kip/in). Calculating CLT diaphragm displacement based on NDS methods proved to be conservative compared to test results for the purposes of determining ASCE 7-16 diaphragm flexibility status.
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Seismic Design of Floor Diaphragms in Post-Tensioned Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue507
Year of Publication
2014
Topic
Design and Systems
Seismic
Material
LVL (Laminated Veneer Lumber)
Application
Walls
Floors
Author
Moroder, Daniel
Sarti, Francesco
Palermo, Alessandro
Pampanin, Stefano
Buchanan, Andrew
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Walls
Floors
Topic
Design and Systems
Seismic
Keywords
Post-Tensioned
Frame Elongation
Rocking
Diaphragm
Lateral Load Resisting System
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Seismic damage to floor diaphragms because of displacement incompatibilities are a point of concern in many structures. This paper studies the behaviour of timber diaphragms subjected to frame elongation and rocking of walls in post-tensioned timber buildings. Experimental tests with special connection details between floor panels and between the diaphragm and the lateral load resisting system show that floor damage in severe earthquakes can be avoided by designing for flexibility and proper connection detailing
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9 records – page 1 of 1.