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Acoustical Guide: Acoustic Research Report on Mass Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue1839
Year of Publication
2018
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Other Materials
Application
Floors
Organization
AcoustiTECH
Editor
Dompierre, David
Garant, Samuel
Publisher
AcoustiTECH
Year of Publication
2018
Format
Book/Guide
Material
CLT (Cross-Laminated Timber)
Other Materials
Application
Floors
Topic
Acoustics and Vibration
Keywords
Mass Timber
Sound Absorption
Impact Sound Insulation
Research Status
Complete
Summary
AcoustiTECH is a North American leader in acoustic solitions and has quickly become the reference standard in the industry. For 25 years, AcoustiTECH has teamed uo with Architects, builders, general contractors, acoustic consultants and other stakeholders to help them achieve their vision by providing proven acoustical solutions and expertise. AcoustiTECH looks at the specific requirements of each individual project, evaluates the requirements, determines the needs and provides personalized solutions. AcoustiTECH's approach is unique, efficient and reliable. We possess our own acoustic laboratory that we use for our research and development in order to recommend the best acoustic solutions by type of structure. Thousands of tests have been performed inclusing over 300 on heavy timber assemblies. The principal objective of creating this document is for the professionals to compare and choose from 25 assemblies the ones that suit their needs the best. The most interesting and popular assemblies have been selected and compared side by side in the same environment, built and tested by the same professional unisg the same flooring materials. It is important to note that the quality of construction can affect the performance. Indeed, construction standards and assemblies recommendations must be followed in order to reach the seeking performance.
Online Access
Free
Resource Link
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Acoustically-Tested Mass Timber Assemblies

https://research.thinkwood.com/en/permalink/catalogue2639
Year of Publication
2020
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
NLT (Nail-Laminated Timber)
Glulam (Glue-Laminated Timber)
MPP (Mass Plywood Panel)
Application
Floors
Walls

Acoustic performance of junctions in cross laminated timber constructions

https://research.thinkwood.com/en/permalink/catalogue3097
Year of Publication
2019
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Author
Hörnmark, Jesper
Organization
Chalmers University of Technology
Year of Publication
2019
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Topic
Acoustics and Vibration
Keywords
Mass Timber
Vibration Reduction Index
Flanking Transmission
Research Status
Complete
Summary
With the emergence of cross laminated timber (CLT) as a structural material on the global market, the need to understand the acoustical behavior of buildings constructed with the material grows. CLT faces a set of challenges that concrete or masonry do not; being low density, high in stiffness, sometimes isotropic and sometimes orthotropic depending on the composition. Flanking sound transmission often becomes an issue in the acoustic performance of mass timber buildings. While direct sound transmission can be treated with conventional methods e.g. additional layers, the flanking paths are more complicated to treat since they need to transfer loads over the length of the element. This master’s thesis aims to investigate the flanking paths in cross laminated timber buildings by measuring the structure-borne vibration reduction index (Kij) in realized buildings. The in-field measurements are compared to standardized estimation models and lab measurements published in past research. This thesis finds that standardized estimations underestimate the performance of the examined junctions in low frequencies. The lab measurements are closer to the in-field performance but exaggerate the influence of metal connections and mass-spring behavior of junctions with elastic interlayers. Additionally the theory and results indicates that external loads on the junction play a major role in the resulting performance. Elastic interlayers are not as effective in low levels as in the high levels of any given building, presenting a challenge as mass timber structures are increasingly being built taller.
Online Access
Free
Resource Link
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Advanced Timber Construction Industry: A Review of 350 Multi-Storey Timber Projects from 2000–2021

https://research.thinkwood.com/en/permalink/catalogue3006
Year of Publication
2022
Topic
Market and Adoption
Application
Wood Building Systems
Author
Svatoš-Ražnjevic, Hana
Orozco, Luis
Menges, Achim
Organization
University of Stuttgart
Editor
Brandner, Reinhard
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Application
Wood Building Systems
Topic
Market and Adoption
Keywords
Multi-storey Timber Construction
Timber Buildings
Mass Timber Construction
Survey
Typologies
Trends and Perspectives
Timber Morphologies
Research Status
Complete
Series
Buildings
Summary
Throughout the last two decades the timber building sector has experienced a steady growth in multi-storey construction. Although there has been a growing number of research focused on trends, benefits, and disadvantages in timber construction from various technical perspectives, so far there is no extensive literature on the trajectory of emerging architectural typologies. This paper presents an examination of architectural variety and spatial possibilities in current serial and modular multi-storey timber construction. It aims to draw a parallel between architectural characteristics and their relation to structural systems in timber. The research draws from a collection of 350 contemporary multi-storey timber building projects between 2000 and 2021. It consists of 300 built projects, 12 projects currently in construction, and 38 design proposals. The survey consists of quantitative and qualitative project data, as well as classification of the structural system, material, program, massing, and spatial organization of the projects. It then compares the different structural and design aspects to achieve a comprehensive overview of possibilities in timber construction. The outcome is an identification of the range of morphologies and a better understanding of the design space in current serial and modular multi-storey mass timber construction.
Online Access
Free
Resource Link
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Advanced Wood-Based Solutions for Mid-Rise and High-Rise Construction: Analytical Models for Balloon-Type CLT Shear Walls

https://research.thinkwood.com/en/permalink/catalogue1877
Year of Publication
2018
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Chen, Zhiyong
Cuerrier-Auclair, Samuel
Popovski, Marjan
Organization
FPInnovations
Year of Publication
2018
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Design and Systems
Keywords
Lateral Loads
Shear
Mass Timber
Research Status
Complete
Summary
Lack of research and design information for the seismic performance of balloon-type CLT shear walls prevents CLT from being used as an acceptable solution to resist seismic loads in balloon-type mass-timber buildings. To quantify the performance of balloon-type CLT structures subjected to lateral loads and create the research background for future code implementation of balloon-type CLT systems in CSA O86 and NBCC, FPInnovations initiated a project to determine the behaviour of balloon-type CLT construction. A series of tests on balloon-type CLT walls and connections used in these walls were conducted. Analytical models were developed based on engineering principles and basic mechanics to predict the deflection and resistance of the balloon-type CLT shear walls. This report covers the work related to development of the analytical models and the tests on balloon-type CLT walls that the models were verified against.
Online Access
Free
Resource Link
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Advancement of Timber Panels as Structural Elements in Timber-Steel Composite Floor Systems

https://research.thinkwood.com/en/permalink/catalogue2844
Topic
Design and Systems
Material
Steel-Timber Composite
Application
Floors
Organization
Auburn University
Material
Steel-Timber Composite
Application
Floors
Topic
Design and Systems
Keywords
Mass Timber
Timber-Steel Hybrid
Research Status
In Progress
Notes
Project contact is Kadir Sener at Auburn University
Summary
While the emphasis in the timber industry understandably focuses predominately on complete mass timber structures, opportunities to substantially expand the mass timber market exist using composite timber-steel systems. Timber-steel composite systems have a high potential to be an economically, architecturally, and structurally feasible system to expand the usage of timber panels for mid-rise and high-rise structures where mass timber is currently not a feasible option. In this novel system, prefabricated timber panels replace reinforced concrete slabs to provide the floor and diaphragm elements that work compositely with steel beams and to improve the structural performance compared to either individual material. Considerable testing effort outside the US has explored the feasibility and benefits of these composite systems. This has led to implementation of this novel system on a number of international construction projects. However, the topic has not been assimilated by researchers and practitioners in the US. Hence, this proposal focuses on identifying and removing barriers and providing design guidance on using steel-timber composite systems in US construction. The proposal: (i) Engages a diverse body of stakeholders in an advisory panel and workshop, (ii) Completes engineering-based testing and analysis to demonstrate feasibility, (iii) Performs constructability studies (i.e., construction cost, speed, env. impact), and (iv) Establishes preliminary design guidelines and approaches. The goal of the project will be to demonstrate the performance and economy of a timber-steel composite system(s) and establish preliminary design guidelines and approaches for target stakeholders. Ultimately, the project will develop experimentally validated design-detailing configurations and establish design specifications for new mass timber markets in multiple construction sectors.
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Advancing Tall Mass Timber Buildings through Seismic Resilience Testing

https://research.thinkwood.com/en/permalink/catalogue2584
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Wood Building Systems
Cores
Organization
University of Nevada
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Wood Building Systems
Cores
Topic
Seismic
Keywords
Rocking Walls
Shake Table Test
Mass Timber
Non-structural Components and Systems
Research Status
In Progress
Notes
Project contact is Keri Ryan at University of Nevada, Reno
Summary
A landmark shake table test of a 10-story mass timber building will be conducted in late 2020. The test program, funded by other sources, will help accelerate the adoption of economically competitive tall timber buildings by validating the seismic performance of a resilient cross-laminated timber (CLT) rocking wall system. In this project, we leverage and extend the test program by including critical nonstructural components and systems (NCS). Including NCSs, which are most vulnerable to rocking induced deformations of the CLT core, allows investigation of the ramification of this emerging structural type on building resiliency. Quantifying interactions amongst vertically and horizontally spanning NCSs during earthquake shaking will allow designers to develop rational design strategies for future installation of such systems. The expected research outcomes are to expand knowledge of rocking wall system interactions with various NCS, identify NCS vulnerabilities in tall timber buildings, and develop solutions to address these vulnerabilities. Moreover, this effort will greatly increase visibility of the test program. The results of this research will be widely disseminated to timber design and NCS communities through conference presentations, online webinars, and distribution to publicly accessible research repositories. 
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An Overview of Cross-Laminated Timber in North America

https://research.thinkwood.com/en/permalink/catalogue2138
Year of Publication
2018
Topic
Design and Systems
Market and Adoption
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Parajuli, Rajan
Gale, Charles
Vlosky, Richard
Martin III, Roy
Year of Publication
2018
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Market and Adoption
Keywords
Mass Timber
Market Status
Conference
International Scientific Conference WoodEMA
Research Status
Complete
Summary
Mass timber products, wood-based engineered construction materials, are becoming widely prevalent in the design and construction sector. Being a cost-effective, carbon efficient, durable, and sustainable building option, mass timber construction has already had a profound impact in residential and non-residential applications in Europe, and it has been reaching new heights in Canada, and recently gaining momentum in the United States. All architects, builders, designers, and forestry communities including the forest product industry, landowners, rural communities, and environmentalists have reason to be excited about these promising new timber products. Mass timber products are envisioned as substitutes for traditional building materials like concrete, masonry, and steel. The most widespread mass timber product is cross-laminated timber (CLT), which was first introduced in the early 1990s in Austria and Germany. It is currently on a rapid upward trajectory in North America. The main purpose of this article is to provide a brief overview of CLT and its market status and future prospects in North America.
Online Access
Free
Resource Link
Less detail

Buckling-restrained Braced Frames for Seismically Resilient Mass Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue2571
Topic
Seismic
Wind
Application
Frames
Organization
University of Utah
Application
Frames
Topic
Seismic
Wind
Keywords
Buckling Restrained Brace Frames
Resilient Building Design
Mass Timber
Energy Dissipation
Monitoring
Research Status
In Progress
Notes
Project contact is Chris Pantelides at the University of Utah
Summary
A mass timber buckling-restrained braced frame is proposed to enhance the seismic resilience of mass timber buildings. Constructed using wood generated from the national forest system, the mass timber buckling-restrained brace will be integrated with a mass timber frame for structural energy dissipation under seismic or wind loads. The team will improve and optimize the design of structural components based on feedback from a real-time health monitoring system. Outcomes include guidelines for a lateral force resisting system of mass timber buildings in high seismic or wind regions.
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Building Affordable Housing with Mass Timber

https://research.thinkwood.com/en/permalink/catalogue2783
Topic
Market and Adoption
Application
Wood Building Systems
Organization
Sustainable Northwest
Hacienda Community Development Group
Application
Wood Building Systems
Topic
Market and Adoption
Keywords
Mass Timber
Residential Buildings
Life Cycle Analysis
Project Financing
Affordable Housing
Research Status
In Progress
Summary
Sustainable Northwest (SNW) and Hacienda Community Development Group (HCDC), both based in Oregon, have proposed a plan to demonstrate pathways for building affordable housing with regionally sourced mass timber. In response to the region’s housing shortage, the partners’ proposal demonstrates the use of mass timber products while supporting efforts to educate stakeholders on wood product companies and forest restoration. The project outlines a plan to explore financing options, build one or more prototypes, and perform a structural material life cycle analysis.
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112 records – page 1 of 12.