Skip header and navigation

Refine Results By

335 records – page 2 of 34.

Advanced Methods of Encapsulation

https://research.thinkwood.com/en/permalink/catalogue41
Year of Publication
2015
Topic
Fire
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Ranger, Lindsay
Roy-Poirier, Audrey
Organization
FPInnovations
Year of Publication
2015
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Fire
Keywords
Codes
Encapsulation
Type X Gypsum Board
National Building Code of Canada
Tall Wood
Research Status
Complete
Summary
This project aims to support the construction of tall wood buildings by identifying encapsulation methods that provide adequate protection of mass timber elements; the intention is that these methods could potentially be applied to mass timber elements so that the overall assembly could achive a 2 h fire resistance rating.
Online Access
Free
Resource Link
Less detail

Advanced Wood-Based Solutions for Mid-Rise and High-Rise Construction: In-Situ Testing of the Origine 13-Storey Building for Vibration and Acoustic Performances

https://research.thinkwood.com/en/permalink/catalogue1474
Year of Publication
2018
Topic
Acoustics and Vibration
Serviceability
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Floors
Walls
Author
Hu, Lin
Cuerrier-Auclair, Samuel
Organization
FPInnovations
Year of Publication
2018
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Floors
Walls
Topic
Acoustics and Vibration
Serviceability
Keywords
Origine
Natural Frequencies
Damping Ratios
Sound Insulation
Ambient Vibration Tests
Static Deflection
Apparent Sound Transmission Class
Apparent Impact Insulation Class
Research Status
Complete
Summary
Serviceability performance studied covers three different performance attributes of a building. These attributes are 1) vibration of the whole building structure, 2) vibration of the floor system, typically in regards to motions in a localized area within the entire floor plate, and 3) sound insulation performance of the wall and floor assemblies. Serviceability performance of a building is important as it affects the comfort of its occupants and the functionality of sensitive equipment as well. Many physical factors influence these performances. Designers use various parameters to account for them in their designs and different criteria to manage these performances. Lack of data, knowledge and experience of sound and vibration performance of tall wood buildings is one of the issues related to design and construction of tall wood buildings. In order to bridge the gaps in the data, knowledge, and experience of sound and vibration performance of tall wood buildings, FPInnovations conducted a three-phase performance testing on the Origine 13-storey CLT building of 40.9 m tall in Quebec city. It was the tallest wood building in Eastern Canada in 2017.
Online Access
Free
Resource Link
Less detail

Advanced Wood-Based Solutions for Mid-Rise and High-Rise Construction: Proposed Vibration-Controlled Design Criterion for Supporting Beams

https://research.thinkwood.com/en/permalink/catalogue1178
Year of Publication
2018
Topic
Acoustics and Vibration
Mechanical Properties
Application
Floors
Author
Hu, Lin
Organization
FPInnovations
Year of Publication
2018
Format
Report
Application
Floors
Topic
Acoustics and Vibration
Mechanical Properties
Keywords
Floor Supporting Beam
Bending Stiffness
Research Status
Complete
Summary
For wood floor systems, their vibration performance is significantly dependent on the conditions of their supports, specifically the rigidity of the support. Detrimental effects could result if the floor supports do not have sufficient rigidity. This is special ture for floor supporting beams. The problem of vibrating floor due to flexible supporting beams can be solved through proper design of the supporting beams. However, there is currently no criterion set for the minimum requirement for floor supporting beam stiffness to ensure the beam is rigid enough. Designers’ current practice is to use the uniform load deflection criteria specified in the code for designing the supporting beams. This criterion is based on certain ratios of the floor span (e.g. L/360, L/480 etc.). The disadvantage of this approach is that it allows larger deflections for longer-span beams than for shorter beams. This means that engineers have to use their experience and judgement to select a proper ratio, particularly for the long-span beams. Therefore, a better vibration-controlled design criterion for supporting beams is needed. It is recommended to further verify the ruggedness of the proposed stiffness criterion for floor supporting beams using new field supporting beam data whenever they become available.
Online Access
Free
Resource Link
Less detail

Advancement of Timber Panels as Structural Elements in Composite Floor Systems of Timber-Steel Hybrid Structures

https://research.thinkwood.com/en/permalink/catalogue2785
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
LVL (Laminated Veneer Lumber)
Application
Floors
Hybrid Building Systems
Organization
Auburn University
Material
CLT (Cross-Laminated Timber)
LVL (Laminated Veneer Lumber)
Application
Floors
Hybrid Building Systems
Topic
Design and Systems
Keywords
Timber-Steel Hybrid
Research Status
In Progress
Notes
United States
Summary
Auburn University’s (AU) School of Forestry and Wildlife Sciences (SFWS) in Alabama actively works to increase awareness of the benefits of CLT along with hybrid systems for more widespread adoption in multiple building segments. AU’s two-year project proposal outlines a plan that will establish a preliminary design for the usage of a timber-steel composite system, utilizing CLT or laminated veneer lumber (LVL), as an option that will replace reinforced concrete slabs to improve the structural performance for buildings six stories or more.
Less detail

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 (United States)
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.
Less detail

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
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
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.
Online Access
Payment Required
Resource Link
Less detail

Analysis on Structureborne Sound Transmission at Junctions of Solid Wood Double Walls with Continuous Floors

https://research.thinkwood.com/en/permalink/catalogue1869
Year of Publication
2014
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Author
Schoenwald, Stefan
Zeitler, Berndt
Sabourin, Ivan
Organization
European Acoustics Association
Year of Publication
2014
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Topic
Acoustics and Vibration
Keywords
Sound Transmission
Sound Insulation
Radiation Efficiencies
Conference
Forum Acusticum 2014
Research Status
Complete
Notes
September 7-12, 2014, Krakow, Poland
Summary
Structure-borne sound transmission across a cross-junction of double solid timber walls with a solid timber floor was analyzed in a recent research project. Both, the double walls as well as floor slab, were of so-called Cross Laminated Timber (CLT). The floor slab was continuous across the junction for structural reasons and thus, formed a sound bridge between the elements of the double wall. To gain a better understanding of the contributions of sound transmission between the wall and floor elements from the different possible paths, a thorough analysis was conducted. Hereby, direct sound transmission through, and radiation efficiencies of, the CLT elements were measured in a direct sound transmission facility; as well as, structure-borne sound transmission between CLT elements was measured on a junction mock-up. The experimental data was used as in-put data and for validation of the engineering model of EN 12354/ISO 15712 for the prediction of flanking sound insulation in buildings. The test procedures, analysis and results of this research project are presented here.
Online Access
Free
Resource Link
Less detail

Analytical Investigation of the Potential of Hollowcore Mass Timber Panels for Long Span Floor Systems

https://research.thinkwood.com/en/permalink/catalogue3353
Year of Publication
2021
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Floors
Author
Hull, T.
Lacroix, D.
Organization
University of Waterloo
Publisher
Springer
Year of Publication
2021
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Floors
Topic
Mechanical Properties
Keywords
Long Span
Vibration Controlled Span
Conference
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021
Research Status
Complete
Notes
Page 621
Summary
Mass timber products have shown tremendous potential as sustainable structural components in large building systems. However, challenges occur when open floor plan structures are desired due to conventional flat slab floor systems having difficulties achieving the longer floor span expectations (i.e., exceeding 9 m). This paper investigates the potential of an all-wood solution, namely, hollowcore mass timber (HMT) panels, in meeting the demands of longer spans while also minimizing the use of wood material when compared to a solid slab. A 400 mm deep, 9 m long HMT panel composed of 3-layer cross-laminated timber (CLT) panels as flanges, and glulam beams as webs, is compared to the maximum commonly available CLT and dowel-laminated timber (DLT) alternatives. Two analytical methods and a finite element model are used to determine the effective bending stiffness of the HMT panel, while CSA O86 design procedures are used for the CLT and DLT panels. The effective bending stiffness of the HMT panel between the finite element model and analytical methods ranged from 1.71–1.94 and 1.14–1.29 times greater, despite being 18% and 24% lighter, than the CLT and DLT panels, respectively. Although slightly deeper, the HMT section provided a more efficient use of materials when compared to the solid slab options. The vibration-controlled span limit of the HMT panel was on average 9.8 m, which was 1.8 m and 0.9 m longer than the CLT and DLT panels, respectively. Further areas of study were also identified and will be investigated as part of future work in the broader HMT panel research program.
Online Access
Free
Resource Link
Less detail

Analytical Procedure for Timber-Concrete Composite (TCC) System with Mechanical Connectors

https://research.thinkwood.com/en/permalink/catalogue3119
Year of Publication
2022
Topic
Design and Systems
Material
Timber-Concrete Composite
Application
Floors
Author
Mirdad, Md Abdul Hamid
Khan, Rafid
Chui, Ying Hei
Organization
University of Illinois at Urbana-Champaign
University of Alberta
Editor
Tullini, Nerio
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Material
Timber-Concrete Composite
Application
Floors
Topic
Design and Systems
Keywords
Mechanical Connectors
Progressive Yielding
Effective Bending Stiffness
Deflection
Vibration
Research Status
Complete
Series
Buildings
Summary
In the construction of modern multi-storey mass timber structures, a composite floor system commonly specified by structural engineers is the timber–concrete composite (TCC) system, where a mass timber beam or mass timber panel (MTP) is connected to a concrete slab with mechanical connectors. The design of TCC floor systems has not been addressed in timber design standards due to a lack of suitable analytical models for predicting the serviceability and safety performance of these systems. Moreover, the interlayer connection properties have a large influence on the structural performance of a TCC system. These connection properties are often generated by testing. In this paper, an analytical approach for designing a TCC floor system is proposed that incorporates connection models to predict connection properties from basic connection component properties such as embedment and withdrawal strength/stiffness of the connector, thereby circumventing the need to perform connection tests. The analytical approach leads to the calculation of effective bending stiffness, forces in the connectors, and extreme stresses in concrete and timber of the TCC system, and can be used in design to evaluate allowable floor spans under specific design loads and criteria. An extensive parametric analysis was also conducted following the analytical procedure to investigate the TCC connection and system behaviour. It was observed that the screw spacing and timber thickness remain the most important parameters which significantly influence the TCC system behaviour.
Online Access
Free
Resource Link
Less detail

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
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Wood Building Systems
Topic
Seismic
Design and Systems
Keywords
US
Diaphragm
Model
High-Rise
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.
Online Access
Free
Resource Link
Less detail

335 records – page 2 of 34.