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The alternating stairs (3) requires one unit of space per step: the same as the half-width stairs (2), and half as much as the full-width stairs (1). Thus, the horizontal distance between steps is in this case reduced by a factor of two, reducing the size of each step.
Emergency exit in Universitetet metro station in Stockholm. An emergency exit in a building or other structure is a special exit used during emergencies such as fires.The combined use of regular and emergency exits allows for faster evacuation, and emergency exits provide alternative means of evacuation if regular exits are inaccessible.
The purpose of building codes is to provide minimum standards for safety, health, and general welfare including structural integrity, mechanical integrity (including sanitation, water supply, light, and ventilation), means of egress, fire prevention and control, and energy conservation. [9] [10] Building codes generally include:
The platform and stairs usually consist of open steel gratings, to prevent the build-up of ice, snow, and leaves. Railings are usually provided on each of the levels, but as fire escapes are designed for emergency use only, these railings often do not need to meet the same standards as railings in other contexts.
Binggeli, Corky (2011). "Structural Systems § Exit Stairs". Building Systems for Interior Designers (2nd ed.). John Wiley and Sons. ISBN 978-1-118-17432-6. Burke, Robert A. (2008). Fire protection: systems and response. CRC Press. ISBN 978-1-56670-622-3. Bush, Vincent R. (1988). Handbook to the uniform building code: an illustrative commentary ...
The means of egress requirement of the code implies that for tall buildings, at least two staircases connected by a corridor are required. [17] Due to this restriction, the architectural floor plans of tall buildings that comply with the code are severely limited. [ 18 ]
The publication Life Safety Code, known as NFPA 101, is a consensus standard widely adopted in the United States. [according to whom?] It is administered, trademarked, copyrighted, and published by the National Fire Protection Association and, like many NFPA documents, is systematically revised on a three-year cycle.
The minimum width of the handrail above the recess shall be 1 + 1 ⁄ 4 inches (32 mm) to a maximum of 2 + 3 ⁄ 4 inches (70 mm). Edges shall have a minimum radius of 0.01 inches (0.25 mm). Handrails are located at a height between 34 and 38 inches (864 and 965 mm).
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