Fire Science and Technology
Online ISSN : 1882-0492
Print ISSN : 0285-9521
ISSN-L : 0285-9521
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Volume 23, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • A Burning Model for Charring Materials and Its Application to the Compartment Fire Development
    Keisuke Himoto, Takeyoshi Tanaka
    2004 Volume 23 Issue 3 Pages 170-190
    Published: 2004
    Released on J-STAGE: October 20, 2007
    DOIhttps://doi.org/10.3210/fst.23.170
    JOURNAL FREE ACCESS
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    A one-dimensional integral model is formulated to describe the transient burning of charring materials. In the model, the sequence of events occurring in a material when exposed to a fire environment is divided into following sequential phases: (I) initial heating phase, (II) pyrolysis phase, (III) char oxidation phase. The calculated mass loss rates are shown to be in reasonable agreement with the existing experimental data. The burning model is then incorporated into a one-layer zone compartment fire model. The fuel inside the compartment is divided into multiple fuel elements, and the compartment fire behaviors are described as the consequence of the burning of each of these fuel elements. The comparison with experimental data in the literature also agreed well.
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  • Fire Resistance of Composite Beams Composed of Rolled Steel Profile Concreted Between Flanges
    Akio Kodaira, Hideo Fujinaka, Hirokazu Ohashi, Toshihiko Nishimura
    2004 Volume 23 Issue 3 Pages 192-206
    Published: 2004
    Released on J-STAGE: October 20, 2007
    DOIhttps://doi.org/10.3210/fst.23.192
    JOURNAL FREE ACCESS
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    Fire resistance tests were performed for composite beams composed of rolled steel profile concreted between flanges. In the present paper, the fire resistant test results and numerical analysis results are described. As a result of the fire resistant tests, the relation between the fire resistance time and applied bending moment of the composite beam is clarified. Analytical results agreed with tests results and consequently, the analytical model can be used to predict the behavior of this composite beam in a fire.
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  • Analytical Method for High Temperature Collapse of a 3D Steel Frame
    Akio Hori
    2004 Volume 23 Issue 3 Pages 208-221
    Published: 2004
    Released on J-STAGE: October 20, 2007
    DOIhttps://doi.org/10.3210/fst.23.208
    JOURNAL FREE ACCESS
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    Stiffness assumptions affect even a simple incremental analysis and moreover a buckling or 3D elasto-plastic analysis. The Trial Stiffness Selection (TSS) method, that was proposed by the authors and enables a large deformation elasto-plastic analysis of a large 3D frame using stress-strain curves, is newly extended to analyze high temperature collapse of a steel frame. Using the proposed TSS-Thermal (TSST) method, collapse of a tube structure under elevated temperature is analyzed successfully. In the case with a wide hole on the tube, its columns show plasticity in the early stage beside the hole and redistribute their axial forces.
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  • Experimental Study on the Fire-Spreading Prevention Effect in Buildings by Drencher Equipment
    Masayuki Hirota, Hideki Mizuochi, Kenichi Ikeda, Yoshifumi Ohmiya, Yuk ...
    2004 Volume 23 Issue 3 Pages 222-239
    Published: 2004
    Released on J-STAGE: October 20, 2007
    DOIhttps://doi.org/10.3210/fst.23.222
    JOURNAL FREE ACCESS
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    In this study, fire experiments were carried out using furnace on a fire prevention system that consisted of a drencher from which water was discharged forming a water curtain and was to be used as a partition to divide a floor space in a building (i.e. a fire prevention area), aiming to obtain quantitative knowledge on the performance of the fire prevention system in preventing fire from spreading and to contribute to the development of more effective fire prevention systems in the future. Reductions in temperature by the water curtain on the other side of the fire were monitored, and heating tests were conducted using parameters such as the shape of the opening to which the drencher head was installed, heating methods (standard heating temperatures of ISO834, constant temperature heating at 300oC and 500oC), and water discharge modes (arrangements of the drencher heads and water discharge rate). The tests revealed the effects of the water curtain formation on the temperature and its radiation heat absorption intensity. The water curtain reduced the temperature on the other side of the fire by about 25% to 75% compared to the temperature that was measured at the upper part on the furnace side.
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