Bulletin of Japan Association for Fire Science and Engineering
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Volume 58 , Issue 3
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Paper
  • Masaaki YASHIMA
    Volume 58 (2008) Issue 3 Pages 47-56
    Released: September 29, 2009
    JOURNALS FREE ACCESS
    Fire in the piled RDF is one of the complicated combustion phenomena. In this study, a simplification of the fire spread is considered in order to analyze this phenomenon, and single RDF sample ignites on a hot surface, and then the fire (combustion zone or reaction zone) spreads upward direction is made to be an object. In the experiment, the following are examined : thermogravimetry (TG), ignitability and fire spreading characteristics with hot surface temperature change, and temperature measurement in the sample. As a result of the experiment, there are five temperatures peaks in the weight loss, and they are 230 °C, 292 °C, 405 °C, 454 °C, 636 °C. Pyrolysis of the organic substance is the multiple stage, and it is clearly divided into range of 230°C-400°C and 400-550°C. It is found to ignite over 450°C, though it does not ignite in 400°C at the hot surface temperature. The fire spreads without flame in the mode of smoldering. The maximum temperature of the reaction zone is about 600°C. Although combustion process is dependent on the raw material of RDF, it estimated that the distance between the preheat zone and the reaction zone is 8∼9 mm in the fire spreading based on the temperature measurement and TG.
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  • Jun'ichi YAMAGUCHI, Ayako ITO, Takeyoshi TANAKA
    Volume 58 (2008) Issue 3 Pages 57-66
    Released: September 29, 2009
    JOURNALS FREE ACCESS
    It is necessary for sound development of performance-based fire safety design method of building to incorporate fire risk aspect into the method. Design fire scenarios and acceptable safety criteria in performance-based fire safety design play the role to control fire risk of buildings within an acceptable level. However, the relationship between the fire risk and the design fires in current performance-based fire safety design method has not been clarified. In this paper, an attempt was made to develop a methodology for appropriately selecting design fire for evacuation safety designs. Determination of acceptable safety criteria and selection of growth rate coefficient of heat release rate of design fire in evacuation safety designs are considered.
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