A numerical study on fire endurance of wood beams exposed to three-side fire

To investigate the fire endurance of wood beams exposed to three-side fire, we conducted bearing capacity tests of two wood beams and experiments of five wood beams exposed to three-side fire. The finite element software ANSYS was also used to predict the fire endurance of those beams with the indir...

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Bibliographic Details
Published inJournal of Zhejiang University. A. Science Vol. 13; no. 7; pp. 491 - 505
Main Authors Zhang, Jin, Xu, Qing-feng, Xu, Yi-xiang, Wang, Bin, Shang, Jing-xiang
Format Journal Article
LanguageEnglish
Published Heidelberg SP Zhejiang University Press 01.07.2012
Subjects
Beams (structural)
Civil Engineering
Classical and Continuum Physics
Durability
Endurance
Engineering
Exposure
Finite element method
Fires
Industrial Chemistry/Chemical Engineering
Mathematical analysis
Mechanical Engineering
Wood
Three-side fire
Fire prevention measures
TU352.5
TU366.2
Finite element analysis
Density of wood
Load level
Fire endurance
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ISSN1673-565X
1862-1775
DOI10.1631/jzus.A1200022

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Summary:To investigate the fire endurance of wood beams exposed to three-side fire, we conducted bearing capacity tests of two wood beams and experiments of five wood beams exposed to three-side fire. The finite element software ANSYS was also used to predict the fire endurance of those beams with the indirect order coupling method. It was found that the fire endurance decreases as the load level increases, and the reduction ratio tends to decrease. In the case of a certain load level, the fire endurance is improved if the section size is increased or covered by the fire protection coating. The central deformation increases as the fire duration increases, and the ratio of increase tends to rise. On another note, an increase in the density of wood leads to a rise in the fire endurance of a given beam. From the finite element method （FEM） calculation results, the fire endurance decreases as the load level increases, and the reduction ratio tends to decrease. When the load level is greater than 0.5, the fire endurance is significantly reduced, and it does not change significantly when the load level changes. Lastly, for a load level magnitude below 0.5, the fire endurance and load level are proportional to one another.
Bibliography:Three-side fire, Fire endurance, Load level, Fire prevention measures, Finite element analysis, Density of wood
Jin ZHANG, Qing-feng XU, Yi-xiang XU, Bin WANG, Jing-xiang SHANG（1.Kev Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China;2.Shanghai Key Laboratory of New Technologv Research on Engineering Structure, Shanghai Research Institute of Building Sciences Shanghai 200032. China;3. Department of Civil Engineering, Strathclvde University, Glasgow G12 8QQ. UK）
To investigate the fire endurance of wood beams exposed to three-side fire, we conducted bearing capacity tests of two wood beams and experiments of five wood beams exposed to three-side fire. The finite element software ANSYS was also used to predict the fire endurance of those beams with the indirect order coupling method. It was found that the fire endurance decreases as the load level increases, and the reduction ratio tends to decrease. In the case of a certain load level, the fire endurance is improved if the section size is increased or covered by the fire protection coating. The central deformation increases as the fire duration increases, and the ratio of increase tends to rise. On another note, an increase in the density of wood leads to a rise in the fire endurance of a given beam. From the finite element method （FEM） calculation results, the fire endurance decreases as the load level increases, and the reduction ratio tends to decrease. When the load level is greater than 0.5, the fire endurance is significantly reduced, and it does not change significantly when the load level changes. Lastly, for a load level magnitude below 0.5, the fire endurance and load level are proportional to one another.
33-1236/O4
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ISSN:1673-565X
1862-1775
DOI:10.1631/jzus.A1200022