建物火災の延焼に関する基礎的研究

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  • A Basic Study on the Fire Spread of Buildings
  • タテモノ カサイ ノ エンショウ ニ カンスル キソテキ ケンキュウ

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In this paper, we consider of fire spread between wooden buildings. The relation between burnt area (A[m2]) and time (x[min]) is approximately S-curve. Former theories are not able to estimate real fire spread condition correctly. As the most appropriate expression, we examine the polynominal and logistic curve. By the method of MAICE, degree of the optimal polynominal is shown three. But the polynominal is not fit for real fire spread phenomenon because it is not always monotone function. On the other hand, we suggest that the function of logistic curve is good enough to explain the fire spread phenomenon. And by modifying the logistic curve, real fire spread phenomenon is shown more correctly. By using this modified logistic curve we can explain not only fire spread phenomenon of one building but also the phenomenon of some buildings by summing up the burnt area of each building. <br>For determination of the parameters of logistic curve, strictly we should take the method of non-linear least square. However, in view of the accuracy of data, the convergence condition and so on, we can put to practical use of two expedient methods, log-linear least square method and finite difference graphical method. Comparison to former method, latter one is more useful because it is able to estimate the value of the parameter G.

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