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An Improved Model for the Fire Design of Cross Laminated Timber in Bending

https://research.thinkwood.com/en/permalink/catalogue1940
Year of Publication
2018
Topic
Fire
Material
CLT (Cross-Laminated Timber)
Author
Schmid, Joachim
Klippel, Michael
Fahrni, Reto
Frangi, Andrea
Tiso, Mattia
Just, Alar
Werther, Norman
Organization
ETH Zurich
Tallinn University of Technical
Technical University Munich
Year of Publication
2018
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Fire
Keywords
Fire Resistance
Model
Zero-Strength Layer
Cross-Section
Bending
Strength
Stiffness
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 20-23, 2018, Seoul, Republic of Korea
Summary
In this study, new design models for cross-laminated timber (CLT) are developed to verify the fire resistance up to 120 minutes. This is done aiming for the popular Effective Cross-Section Method using a so-called zero-strength layer (ZSL) to account for losses in strength and stiffness. This was done using a method earlier presented at WCTE 2010 and discussed with the European industry. To allow for improvements, (a) the current CLT product portfolio was analysed and thermal and mechanical simulations were done accordingly for initially unprotected and unprotected members. Further, (b) new definitions for the ZSL were used to allow for a higher accuracy of the simplified models. As anoutcome, a model with (1) tabulated data between 7.0 and 12.0 mm for the effective ZSL only considering longitudinal layers and (2) a simplified model “twelve and two” is proposed for CLT members in bending.
Online Access
Free
Resource Link
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Charring Behavior of Cross Laminated Timber with Respect to the Fire Protection

https://research.thinkwood.com/en/permalink/catalogue267
Year of Publication
2014
Topic
Fire
Material
CLT (Cross-Laminated Timber)
Author
Tiso, Mattia
Organization
SP Technical Research Institute of Sweden
Year of Publication
2014
Format
Report
Material
CLT (Cross-Laminated Timber)
Topic
Fire
Keywords
Small Scale
Cone Calorimeter
Heat Flux
Gypsum Type F
Plywood
Fire Resistance
Research Status
Complete
Summary
Timber buildings made with Cross-laminated Timber (CLT) panels are becoming wide spread in Europe. The fire resistance of CLT panels depends upon several parameters, including the number of layers and their thickness. At the present, EN 1995-1-2:2004 does not provide specific information on the fire design of CLT panels. Several fire resistance tests of CLT panels were performed in different scales by furnace testing using the standard fire curve according to ISO 834-1:1999, however the large number of possible combination of CLT products makes testing too complicated and expensive as a tool for the verification of the fire resistance of several combinations. In this report are presented nine small-scale tests carried-out at SP Wood Technology (Technical Research Institute of Sweden). The tests consisted in specimens of CLT and massive timber exposed at a two steps of constant heat flux in a cone calorimeter (50 and 75 kW/m2). Some specimens were exposed with two different types of fire protection (gypsum plasterboard type F and plywood) and some were tested unprotected. Later, thermal simulations with the same set-up of tests were implemented on the finite element software package in Safir 2007, with the time-temperature curve given by ISO 834 as input; also the analytical calculation of the charring depth following the Eurocode 5 part 1-2 was done. The target of this thesis is to compare performed CLT furnace tests with the smallscale cone calorimeter tests carried out, the numerical results of the thermal model and the analytical results obtained.
Online Access
Free
Resource Link
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