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Alternate Load-Path Analysis for Mid-Rise Mass-Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue1233
Year of Publication
2018
Topic
Design and Systems
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Floors
Wood Building Systems
Author
Mpidi Bita, Hercend
Tannert, Thomas
Organization
Structures Congress
Publisher
American Society of Civil Engineers
Year of Publication
2018
Country of Publication
United States
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Wood Building Systems
Topic
Design and Systems
Seismic
Keywords
Alternate Load-Path Analysis
Disproportionate Collapse
Lateral Loads
Language
English
Conference
Structures Conference 2018
Research Status
Complete
Notes
April 19–21, 2018, Fort Worth, Texas
Summary
This paper presents an investigation of possible disproportionate collapse for a nine-storey flat-plate timber building, designed for gravity and lateral loads. The alternate load-path analysis method is used to understand the structural response under various removal speeds. The loss of the corner and penultimate ground floor columns are the two cases selected to investigate the contribution of the cross-laminated timber (CLT) panels and their connections, towards disproportionate collapse prevention. The results show that the proposed building is safe for both cases, if the structural elements are removed at a speed slower than 1 sec. Disproportionate collapse is observed for sudden element loss, as quicker removal speed require higher moments resistance, especially at the longitudinal and transverse CLT floor-to-floor connections. The investigation also emphasises the need for strong and stiff column-to-column structural detailing as the magnitude of the vertical downward forces, at the location of the removed columns, increases for quicker removal.
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A Multi-Scalar Approach for the Modelling and Fabrication of Free-Form Glue-Laminated Timber Structures

https://research.thinkwood.com/en/permalink/catalogue1389
Year of Publication
2018
Topic
Design and Systems
Material
Glulam (Glue-Laminated Timber)
Author
Svilans, Tom
Poinet, Paul
Tamke, Martin
Ramsgaard Thomsen, Mette
Publisher
Springer, Singapore
Year of Publication
2018
Country of Publication
Singapore
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Topic
Design and Systems
Keywords
Multi-Scale Modelling
Production
Free-Form
Architecture
Language
English
Conference
Design Modelling Symposium
Research Status
Complete
ISSN
978-981-10-6611-5
Summary
This research project presents both innovative multi-scalar modelling methods and production processes aimed at facilitating the design and fabrication of free-form glue-laminated timber structures. The paper reports on a research effort that aims to elucidate and formalize the connection between material performance, multi-scalar modelling (Weinan 2011), and early-stage architectural design, in the context of free-form glue-laminated timber structures. This paper will examine how the concept of multi-scalar modelling as found in other disciplines can also be used to embed low-level material performance of glue-laminated timber into early-stage architectural design processes, thus creating opportunities for feedback across the design chain and an increased flexibility in effecting changes. The research uses physical prototypes as a means to explore and evaluate the methods presented.
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Tall Cross-Laminated Timber Building: Design and Performance Session WW300 Experimental and Modeling Studies on Wood Frame Buildings

https://research.thinkwood.com/en/permalink/catalogue618
Year of Publication
2014
Topic
Design and Systems
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems
Author
Dolan, Daniel
Bordry, Vincent
Pei, Shiling
van de Lindt, John
Organization
Structures Congress
Publisher
American Society of Civil Engineers
Year of Publication
2014
Country of Publication
United States
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems
Topic
Design and Systems
Seismic
Keywords
Damping
Multi-Story
Ductility
Cost
Fire Resistance
Language
English
Conference
Structures Congress 2014
Research Status
Complete
Notes
April 3-5, 2014, Boston, Massachusetts, United States
Summary
Cross-laminated timber (CLT) is widely perceived as the most promising option for building high-rise wood structures due to its structural robustness and good fire resistance. While gravity load design of a tall CLT building is relatively easy to address because all CLT walls can be utilized as bearing walls, design for significant lateral loads (earthquake and wind) can be challenging due to the lack of ductility in current CLT construction methods that utilize wall panels with low aspect ratios (height to length). Keeping the wall panels at high aspect ratios can provide a more ductile response, but it will inevitably increase the material and labor costs associated with the structure. In this study, a solution to this dilemma is proposed by introducing damping and elastic restoring devices in a multi-story CLT building to achieve ductile response, while keeping the integrity of low aspect ratio walls to reduce the cost of construction and improve fire resistance. The design methodology for incorporating the response modification devices is proposed and the performance of the as-designed structure under seismic is evaluated.
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State-Of-The-Art Review on Cyclic Behaviour of Connections Used in CLT Multi-Storey Buildings: Test Results and Modelling

https://research.thinkwood.com/en/permalink/catalogue472
Year of Publication
2015
Topic
Connections
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Branco, Jorge
Sousa, Hélder
Lourenço, Paulo
Ahvenainen, Julia
Aranha, Chrysl
Publisher
Dolnoslaskie Wydawnictwo Edukacyjne (DWE)
Year of Publication
2015
Country of Publication
Poland
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Connections
Mechanical Properties
Keywords
Monotonic Tests
Cyclic Tests
Strength
Damping Ratios
Language
English
Conference
International Conference on Structural Health Assessment of Timber Structures
Research Status
Complete
Notes
September 9-11, 2015, Wroclaw, Poland
Summary
A timber building made of cross-laminated timber (CLT) panels is a modular system where all panels are pre-cut in factory. On site, the single components are then assembled connecting the panels with mechanical fasteners, mainly angle brackets with nails and/or screws, hold-downs, metal plates and self-tapping screws. CLT wall panels are very rigid in comparison to its connections. Thus, connections play an essential role in maintaining the integrity of the structure providing the necessary strength, stiffness and ductility, and consequently, they need close attention by designers. However, there is still a lack of proper design rules for these connections, in particular under cyclic loads, mainly due to a large variety of connectors and connection systems. In this paper, the different properties of connections for CLT buildings, on both monotonic and cyclic behaviour, are described using recent works from different authors. From the bibliography, it is clear that experimental data, regarding both monotonic and cyclic tests, is required for the assessment of the performance of the CLT structural system attending to the interaction between rigid panels and connections. This work evidences results from experimental campaigns and numerical analysis regarding definition and quantification of the cyclic response of CLT connections. Examples regarding monotonic and cyclic tests aimed to evaluate cyclic behaviour of connections through physical parameters, such as the impairment of strength and the damping ratio, are presented and discussed.
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Mass Timber Buildings and the IBC

https://research.thinkwood.com/en/permalink/catalogue2614
Year of Publication
2020
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Organization
American Wood Council
International Code Council
Publisher
ICC
Year of Publication
2020
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Keywords
Building Code
Mass Timber
Structural
Fire Protection
Construction
Language
English
Research Status
Complete
ISBN
978-1-952468-02-5
Summary
Developed by ICC and American Wood Council, this first edition provides an overview of requirements for mass timber construction as found in the 2021 International Building Code® (IBC®). The document reviews the 2015 IBC’s recognition of cross-laminated timber (CLT), the reorganization of heavy timber provisions in the 2018 IBC, followed by the historic changes in the 2021 IBC and International Fire Code® (IFC®) for tall mass timber construction. The 2021 IBC and IFC include important changes in material technologies and their expanded use as proposed by the ICC Ad Hoc Committee on Tall Wood Buildings. Three new types of construction (Types IV-A, IV-B and IV-C) defined and included in the 2021 codes allow the use of mass timber for buildings of taller heights, more stories above grade, and greater allowable areas compared to existing provisions for heavy timber buildings. Features: More than 100 full-color photos, illustrations and tables enhance comprehension and help users visualize requirements Content accurately reflects mass timber provisions in the 2015, 2018 and 2021 IBC, and 2021 IFC “Change Significance” topics reinforce the content and offer helpful background regarding code provisions Results are provided for five fire tests in a fully furnished structure constructed to simulate Types IV-A, IV-B and IV-C Detailed examples facilitate comprehension of code application and methods of determining code compliance Application of energy, sound transmission, structural loads, and other code provisions to mass timber construction 50 practice questions to help users prepare for ICC certification exams This is an incredibly valuable and time-saving reference for architects, engineers, building/fire officials and inspectors.
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Timber Tower Research: Concrete Jointed Timber Frame

https://research.thinkwood.com/en/permalink/catalogue440
Year of Publication
2014
Topic
Design and Systems
Environmental Impact
Application
Hybrid Building Systems
Author
Baker, William
Horos, David
Johnson, Benton
Schultz, Joshua
Organization
Structures Congress
Year of Publication
2014
Country of Publication
United States
Format
Conference Paper
Application
Hybrid Building Systems
Topic
Design and Systems
Environmental Impact
Keywords
Carbon Dioxide Emissions
Tall Wood
Concrete Jointed Timber Frame
Language
English
Conference
Structures Congress 2014
Research Status
Complete
Notes
April 3-5, 2014, Boston, Massachusetts, United States
Summary
The goal of this research was to develop a structural system for tall buildings using mass-timber as the main structural material that reduces the carbon dioxide emissions associated with the structure. The structural system research was applied to a prototypical building based on an existing concrete benchmark for comparison. This paper discusses key design issues associated with tall mass-timber buildings along with potential solutions. It is believed that the system proposed in the research and discussed in the paper could mitigate many of these design issues. The main structural mass-timber elements are connected by steel reinforcing through cast-in-place concrete at the connection joints. This system plays to the strengths of both materials and allows the designer to apply sound tall building engineering fundamentals. The result is believed to be an efficient structure that could compete with reinforced concrete and structural steel while reducing the associated carbon emissions by 60 to 75%.
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Fire Safety and Tall Timber Buildings—What’s Next?

https://research.thinkwood.com/en/permalink/catalogue1253
Year of Publication
2017
Topic
Design and Systems
Market and Adoption
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Author
Barber, David
Organization
Structures Congress
Publisher
American Society of Civil Engineers
Year of Publication
2017
Country of Publication
United States
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Market and Adoption
Keywords
Fire Safety
Exposed Load Bearing Timber
Concealed Connections
Language
English
Conference
Structures Congress 2017
Research Status
Complete
Notes
April 6–8, 2017, Denver, Colorado
Summary
Model building codes in the United States limit timber construction to six stories, due to concerns over fire safety and structural performance. With new timber technologies, tall timber buildings are now being planned for construction. The process for building approval for a building constructed above the code height limits with a timber load-bearing structure, is by an alternative engineering means. Engineering solutions are required to be developed to document and prove equivalent performance to a code compliant structure, where approval is based on substantive consultation and documentation. Architects in the US are also pushing the boundaries and requesting load-bearing timber be exposed and not fully encapsulated in fire rated gypsum drywall. This provides an opportunity for the application of recent fire research on exposed timber to be applied, and existing methods of analyzing the impact of fire on engineered timber structures to be developed further. This paper provides an overview of the performance based fire safety engineering required for building approval and also describes the engineering methodologies that can be utilized to address specific exposed load-bearing timber issues; concealed connections for glulam beams; and the methodology to address areas of exposed timber.
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Tall Wood Buildings: Design, Construction and Performance

https://research.thinkwood.com/en/permalink/catalogue2483
Edition
Second Edition
Year of Publication
2020
Topic
General Information
Design and Systems
Market and Adoption
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Author
Green, Michael
Taggart, Jim
Edition
Second Edition
Publisher
Birkhauser
Year of Publication
2020
Country of Publication
Switzerland
Format
Book/Guide
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
General Information
Design and Systems
Market and Adoption
Keywords
Tall Wood
Case Study
Building Systems
Built Projects
Language
English
Research Status
Complete
ISBN
978-3035618853
Summary
Tall wood buildings have been at the foreground of innovative building practice in urban contexts for a number of years. From London to Stockholm, from Vancouver to Melbourne timber buildings of up to 20 storeys have been built, are under construction or being considered. This dynamic trend was enabled by developments in the material itself, prefabrication and more flexibility in fire regulations. The low CO2 footprint of wood - often regionally sourced - is another strong argument in its favour. This publication explains the typical construction types such as panel systems, frame and hybrid systems. An international selection of 13 case studies is documented in detail with many specially prepared construction drawings, demonstrating the range of the technology.
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Blast Testing of Loaded Cross-Laminated Timber Structures

https://research.thinkwood.com/en/permalink/catalogue1234
Year of Publication
2018
Topic
Mechanical Properties
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Weaver, Mark
Newberry, Charles
Podesto, Lisa
O’Laughlin, Casey
Organization
Structures Congress
Publisher
American Society of Civil Engineers
Year of Publication
2018
Country of Publication
United States
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Mechanical Properties
Design and Systems
Keywords
Blast Tests
Airblast Loads
Axial Load
Panels
Load Distribution
Quasi-Static
Language
English
Conference
Structures Conference 2018
Research Status
Complete
Notes
April 19–21, 2018, Fort Worth, Texas
Summary
Results from a series of blast tests performed in October 2016 on three two-story, single-bay cross-laminated timber (CLT) structures demonstrated the ability of CLT construction to resist airblast loads in a predictable fashion. These tests were performed on structures without superimposed load to limit inertial resistance. Subsequently, a follow-on series of tests was performed to investigate the response of axially-loaded CLT construction. Panels damaged during the preceding test were removed and replaced. Axial load was applied using precast concrete blocks to simulate the loaded condition of a five-story building at the first-floor front panel of the structures. These test structures were exposed to two shots: the first was designed to keep the structures within their respective elastic ranges while the second was designed to push the structures beyond their elastic limits. Reflected pressure and peak deflections were recorded at the front panels of the test structures to document the two-way panel load distribution behavior under a dynamic load event and the clearing of the shock wave. Prior to conducting the blast tests, a small number of tests were performed on a load tree test apparatus to aid in test planning by investigating the post-peak response of individual CLT panels of various lengths to quasi-static out-of-plane and axial loads applied simultaneously. This paper provides an overview of the results obtained from both the quasi-static and blast tests of axially-loaded CLT. Additionally, the paper compares CLT structure, component, and connection response across the suite of data. Conclusions are offered to assist engineers in the design of load bearing CLT construction exposed to airblast loads.
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Displacement Design Procedure for Cross Laminated Timber (CLT) Rocking Walls with Sacrificial Dampers

https://research.thinkwood.com/en/permalink/catalogue395
Year of Publication
2015
Topic
Design and Systems
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Gu, Mengzhe
Pang, Weichiang
Schiff, Scott
Organization
Structures Congress
Publisher
American Society of Civil Engineers
Year of Publication
2015
Country of Publication
United States
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Design and Systems
Seismic
Keywords
Energy Dissipation
Ductile Behavior
U-Shaped Flexural Plates
Self-centering Mechanism
Language
English
Conference
Structures Congress 2015
Research Status
Complete
Notes
April 23–25, 2015, Portland, Oregon, USA
Summary
This paper presents the preliminary design of a rocking Cross-laminated Timber (CLT) wall using a displacement-based design procedure. The CLT wall was designed to meet three performance expectations: immediate occupancy (IO), life safety (LS), and collapse prevention (CP). Each performance expectation is defined in terms of an inter-story drift limit with a predefined non-exceedance probability at a given hazard level. U-shape flexural plates were used to connect the vertical joint between the CLT panels to obtain a ductile behavior and adequate energy dissipation during seismic motion. A design method for ensuring self-centering mechanism is also presented.
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10 records – page 1 of 1.