Article (Scientific journals)
Experimental investigation of structural failure during the cooling phase of a fire: Timber columns
Gernay, Thomas; Zehfuss, Jochen; Brunkhorst, Sven et al.
2022In Fire and Materials, (2022), p. 1-16
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Keywords :
burnout resistance, cooling phase, fire resistance, glued laminated, structural failure, timber column
Abstract :
[en] This paper describes fire tests on loaded glued laminated timber columns in which the structural response was measured during the heating and cooling phases. Identical columns with 280 280 mm2 cross-section and 3.7 m length were tested under various heating durations in a standard furnace to investigate integrity to full burnout. Two of the columns were subjected to ISO 834 heating until failure and their measured fire resistance was 55 and 58 min, respectively. Two columns were subjected to 15 min of ISO 834 heating followed by controlled cooling; these columns failed during the cooling phase, respectively after 98 and 153 min. Flame selfextinction occurred after approximately 40 min while smoldering continued locally. Two columns tested under 10 min of ISO 834 heating both survived the defined heating–cooling exposure. Thermocouples inside the columns show sustained temperature increases for hours after the end of the heating phase. These full-scale furnace experiments show that timber columns may fail during the cooling phase after exposure to standard heating for about 25% of the standard fire resistance duration. These results, in line with previous numerical predictions, highlight the need for further investigation into fire safety until full burnout for timber structures.
Disciplines :
Civil engineering
Author, co-author :
Gernay, Thomas;  Johns Hopkins University, Baltimore, Maryland, USA
Zehfuss, Jochen;  Technische Universität Braunschweig (iBMB), Braunschweig, Germany
Brunkhorst, Sven;  Technische Universität Braunschweig (iBMB), Braunschweig, Germany
Robert, Fabienne;  CERIB Fire Testing Centre, Epernon, France
Bamonte, Patrick;  Politecnico di Milano, Milan, Italy
McNamee, Robert;  RISE Research Institutes of Sweden + Lund University, Lund, Sweden
Mohaine, Siyimane;  CERIB Fire Testing Centre, Epernon, France
Franssen, Jean-Marc  ;  Université de Liège - ULiège > Département ArGEnCo > Ingénierie du feu
Language :
English
Title :
Experimental investigation of structural failure during the cooling phase of a fire: Timber columns
Alternative titles :
[fr] Recherches expérimentales concernant la ruine structurelle durant la phase de refroidissement d'un incendie: colonnes en bois
Publication date :
07 October 2022
Journal title :
Fire and Materials
ISSN :
0308-0501
eISSN :
1099-1018
Publisher :
John Wiley & Sons, Hoboken, United States - New Jersey
Issue :
2022
Pages :
1-16
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
BURNOUT
Available on ORBi :
since 09 December 2022

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