16 防火上必要なスパンドレルの高さ

抄録

Concrete buildings having large window area have been recently increasing in numbers. Once fire breaks out in one room of such buildings, glass of windows of the room will certainly broken by fire and hot gas may eject from the windows and then glass of upstairs windows heated by rising hot gas may also be broken and consequently fire will spread to the upstairs. To prevent such fire spread to the upstairs, the height of the spandrel between the above and the below windows must be large enough to cool let low the temperature of rising hot gas to a difinite limit, lest the upstairs windows should be broken. The necssary height of the spandrel of a building depends upon various conditions of the building. In this report the method of calculating the necessary height is discussed based chiefly upon the author's theorems which have already been reported.