A Basic Study on Fire Spread Formula at Earthquake

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  • 地震時火災の延焼速度式に関する基礎的研究
  • ジシンジ カサイ ノ エンショウ ソクドシキ ニ カンスル キソテキ ケンキュ

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Abstract

Many fires occurred simultaneously in the Kobe earthquake and the several became city area fires. Thereupon, the fire spread condition were analyzed about large-scale fires that have burn-out area over about 10,000 m2 with this research. We used the fire data that were obtained by Fire Department of Kobe city and Tokyo Fire Department at the present. It is a future research theme about the fire spread condition which fire fighting water for suppressing is considered, because it is not sufficient data regarding fire fighting water for suppressing at the time of a fire. We researched a fire spread formula that considered burn-out area in this paper. The result that was obtained is as follows. <br>1) A fire spread speed formula that considered the complete collapse rate of houses at the time of an earthquake was indicated in eq. (7). Coefficient of correlation between this eq. (7) and the real fire data is r=0.984. This is agreeing fairly well. <br>2) a1 is about from 0.0114 to 0.0626 in the case that G ≒ 10,000∼120,000 m2, complete collapse rate D ≒ 30∼70% and average wind velocity v ≒ 1.3 m/sec as shown in Table 4 and Table 7. This is about 1/13∼1/7 in comparison with a1=0.143∼0.460 of the experiment result of real house group of Saganoseki (G ≒ 150∼804 m2, D=0, v ≒ 1.8 m/s). One of this cause is considered that the houses were completely destroyed about the rate 30∼70%.

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