単一の避難経路が許容される条件 : 2方向避難経路の基準に関する性能的考察その2

概要

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It is commonly believed to be important for safe evacuation in fire that two or more escape routes are arranged in different directions. As a rule, two or more exits are required by building regulations etc. from any point in a building. This intends to assure at least one available egress route if the other is blocked by fire. Limitation of common path length and requirement of two or more stairways are one form of this requirement. In building regulations, a certain length of common path and a single stairway are accepted as a result of compromise between safety and building economy in broad sense. Still, building plans are significantly affected by the limitation of common path length. Due care should be paid to the adequacy of the provisions. In this paper a standard, which is based on the consideration on expected number of occupants unable to escape, is proposed as an alternative to the limitation of common path length and a single stairway. The average level of evacuation safety of the proposed standards are supposed to be equivalent to existing provisions. However, advantage of the proposed standards are they allow to take into account more factors affecting the safety of single escape route within a logical context. This method will allow much more flexibility in building plans without deteriorating the current level of safety.
社団法人日本建築学会の論文
1997-08-30