Abstract
In this paper, we consider of a basic theory of some former fire spread formulas of houses. These formulas are almost analyzed by useing the data of conflagration which were really outbreaked fires, or some real experiments. We suggest the new theory on the data of real experiments by Fire Research Institute of the Ministry of Home Affaires. That is, we establish one effective formula of estimation of fire spread. This formula is adopted logistic curve and it is also fittable in real conditions of fire spread. Former theories are not able to estimate one fire condition until the end. But our theory can predict the fire condition from the beginning to the end. Equation (3-3) contains the value of G, maximum value of fire spread. This G is the factor which expresses real fire spread phenomena more accurately. Furthermore we consider the adoptation of coefficients αand R. Thisαis Decreasing Coefficient (coefficient of decreasing the value of index a in eq. (3-3)). This R is Resistant Coefficient of fire spread concerning to Distance between houses and Surrounding conditions of houses.
