ALLOWABLE CONDITION FOR A SINGLE MEANS OF ESCAPE : A consideration on the safety performance of two way exits provisions Part 2

TL;DRAbstract

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

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