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11 records – page 1 of 2.

Effects of Exposed Cross Laminated Timber on Compartment Fire Dynamics

https://research.thinkwood.com/en/permalink/catalogue1340
Year of Publication
2017
Topic
Fire
Material
CLT (Cross-Laminated Timber)
Application
Rooms
Author
Hadden, Rory
Bartlett, Alastair
Hidalgo, Juan
Santamaria, Simón
Wiesner, Felix
Bisby, Luke
Deeny, Susan
Lane, Barbara
Publisher
ScienceDirect
Year of Publication
2017
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Rooms
Topic
Fire
Keywords
Compartment Fires
Heat Release Rate
Temperature
Exposed Timber
Auto-Extinction
Combustible Material
Heat Transfer
Research Status
Complete
Series
Fire Safety Journal
Summary
A series of compartment fire experiments has been undertaken to evaluate the impact of combustible cross laminated timber linings on the compartment fire behaviour. Compartment heat release rates and temperatures are reported for three configuration of exposed timber surfaces. Auto-extinction of the compartment was observed in one case but this was not observed when the experiment was repeated under identical condition. This highlights the strong interaction between the exposed combustible material and the resulting fire dynamics. For large areas of exposed timber linings heat transfer within the compartment dominates and prevents auto-extinction. A framework is presented based on the relative durations of the thermal penetration time of a timber layer and compartment fire duration to account for the observed differences in fire dynamics. This analysis shows that fall-off of the charred timber layers is a key contributor to whether auto-extinction can be achieved.
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Fire Performance of Hybrid Timber Connections

https://research.thinkwood.com/en/permalink/catalogue2221
Year of Publication
2016
Topic
Connections
Mechanical Properties
Fire
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Columns

Fire Performance of Self-Tapping Screws in Tall Mass-Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue2877
Year of Publication
2021
Topic
Fire
Connections
Material
Glulam (Glue-Laminated Timber)
Author
Létourneau-Gagnon, Mathieu
Dagenais, Christian
Blanchet, Pierre
Organization
Université Laval
FPInnovations
Editor
Hwang, Cheol-Hong
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Topic
Fire
Connections
Keywords
Self-Tapping Screws
Heat Transfer
Fire Performance
Finite Element Modeling
Research Status
Complete
Series
Applied Sciences
Summary
Building elements are required to provide sufficient fire resistance based on requirements set forth in the National Building Code of Canada (NBCC). Annex B of the Canadian standard for wood engineering design (CSA O86-19) provides a design methodology to calculate the structural fire-resistance of large cross-section timber elements. However, it lacks at providing design provisions for connections. The objectives of this study are to understand the fire performance of modern mass timber fasteners such as self-tapping screws, namely to evaluate their thermo-mechanical behavior and to predict their structural fire-resistance for standard fire exposure up to two hours, as would be required for tall buildings in Canada. The results present the great fire performance of using self-tapping screws under a long time exposure on connections in mass timber construction. The smaller heated area of the exposed surface has limited thermal conduction along the fastener’s shanks and maintained their temperature profiles relatively low for two hours of exposure. Based on the heat-affected area, the study presents new design principles to determine the residual length of penetration that would provide adequate load-capacity of the fastener under fire conditions. It also allows determining safe fire-resistance values for unprotected fasteners in mass timber construction exposed up to two hours of standard fire exposure.
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Free
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Fire Resistance of Partially Protected Cross-Laminated Timber Rooms

https://research.thinkwood.com/en/permalink/catalogue322
Year of Publication
2015
Topic
Fire
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Author
Hevia, Alejandro
Organization
Carleton University
Year of Publication
2015
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Topic
Fire
Keywords
Charring Rate
Fire Behaviour
Panels
Heat Transfer Model
Room Fire
Heat Release Rate
Temperature
Gypsum
Research Status
Complete
Summary
This thesis studies the fire behaviour of Cross Laminated Timber (CLT) panels in partially protected rooms. A one-dimensional heat transfer model was developed to determine the fire resistance of CLT floor and wall panels. During this study, three room fire tests were conducted at Carleton University Fire Research Laboratory to determine the maximum percentage of unprotected CLT surface area that will yield similar results to that of a fully protected room. The rooms had a single opening and were constructed entirely using 3-ply, 105 mm thick CLT panels. A non-standard, parametric fire using furniture and clothing as fuel was used and 2 layers of gypsum board were used to cover the ceiling and the protected walls. The Heat Release Rate, temperature, charring rate and gypsum falloff time of each test was collected. The results obtained from the room test were then compared to the numerical heat transfer model to evaluate its accuracy.
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Free
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Heat Transfer Tests on EPS Material and Massive Timber Wall Component

https://research.thinkwood.com/en/permalink/catalogue2224
Year of Publication
2018
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Walls

Hygrothermal Properties of Cross Laminated Timber Panels

https://research.thinkwood.com/en/permalink/catalogue2307
Year of Publication
2017
Topic
Moisture
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
Application
Walls
Wood Building Systems

Large-scale compartment fires to develop a self-extinction design framework for mass timber—Part 1: Literature review and methodology

https://research.thinkwood.com/en/permalink/catalogue2911
Year of Publication
2022
Topic
Fire
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Xu, Hangyu
Pope, Ian
Gupta, Vinny
Cadena, Jaime
Carrascal, Jeronimo
Lange, David
McLaggan, Martyn
Mendez, Julian
Osorio, Andrés
Solarte, Angela
Soriguer, Diana
Torero, Jose
Wiesner, Felix
Zaben, Abdulrahman
Hidalgo, Juan
Organization
The University of Queesland
University of College London
The University of Edinburgh
Publisher
Elsevier
Year of Publication
2022
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Fire
Keywords
Performance-based Design
Compartment Fires
Heat Transfer
Pretection of Wood
Large-scale
Mass Timber
Research Status
Complete
Series
Fire Safety Journal
Summary
Fire safety remains a major challenge for engineered timber buildings. Their combustible nature challenges the design principles of compartmentation and structural integrity beyond burnout, which are inherent to the fire resistance framework. Therefore, self-extinction is critical for the fire-safe design of timber buildings. This paper is the first of a three-part series that seeks to establish the fundamental principles underpinning a design framework for self-extinction of engineered timber. The paper comprises: a literature review introducing the body of work developed at material and compartment scales; and the design of a large-scale testing methodology which isolates the fundamental phenomena to enable the development and validation of the required design framework. Research at the material scale has consolidated engineering principles to quantify self-extinction using external heat flux as a surrogate of the critical mass loss rate, and mass transfer or Damköhler numbers. At the compartment scale, further interdependent, complex phenomena influencing self-extinction occurrence have been demonstrated. Time-dependent phenomena include encapsulation failure, fall-off of charred lamellae and the burning of the movable fuel load, while thermal feedback is time-independent. The design of the testing methodology is described in reference to these fundamental phenomena.
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Free
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Modelling of Heat Transfer in Timber Exposed to Fire

https://research.thinkwood.com/en/permalink/catalogue1683
Year of Publication
2016
Topic
Fire
Material
LVL (Laminated Veneer Lumber)
Author
Diem Thi, Van
Khelifa, Mourad
El Ganaoui, Mohammed
Rogaume, Yann
Year of Publication
2016
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Topic
Fire
Keywords
Numerical Model
Heat Transfer
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4069-4076
Summary
This paper presents a numerical model for heat transfer in timber structures. The thermal behaviour is described by the standard Fourier heat equation. The chosen model integrates the three modes of heat transfer; namely: conduction, radiation and convection during the fire exposure. The theory and the boundary conditions associated with the model are briefly discussed. The identification of the model parameters is carried out with the experimental data available in literature. The simulation results are compared with experiments carried out on laminated veneer lumber (LVL) panels.
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Free
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Novel Testing for Stiffness Reductions of Cross-Laminated Timber at Elevated Temperature

https://research.thinkwood.com/en/permalink/catalogue2454
Year of Publication
2019
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Beams

Understanding Fire Performance of Wood-Concrete Composite Floor Systems

https://research.thinkwood.com/en/permalink/catalogue1777
Year of Publication
2016
Topic
Fire
Connections
Material
CLT (Cross-Laminated Timber)
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Floors
Author
Dagenais, Christian
Ranger, Lindsay
Cuerrier-Auclair, Samuel
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Floors
Topic
Fire
Connections
Keywords
Fire Resistance
Shear Connectors
Heat Transfer
Self-Tapping Screws
Bolts
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 5428-5436
Summary
Three timber-concrete composite floor assemblies were evaluated for fire performance to understand how shear connectors might impact heat transfer into the assemblies. The floor assemblies tested included a CLTconcrete floor with self-tapping screws, a screw-laminated 2x8-concrete using truss plates, and a LVL-concrete using...
Online Access
Free
Resource Link
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11 records – page 1 of 2.