The UK design guide SCI P354, however, provides some specific information pertaining to their design. The AISC 11 design guide, which is the document used predominantly in North America for vibration design, does not contain any specific requirements for staircases. The damping ratio and the pace frequency have a significant influence on the vibration behavior of the structure. ![]() The long spans, low mass, in conjunction with a low damping ratio, can result in a low-frequency system that responds with high human-induced accelerations. The gravity design of such staircases is trivial however, designing the staircase to be insensitive to vibrations due to human activity is often challenging. ![]() ![]() ![]() Generally, the iconic staircase is constructed from steel, has long unsupported spans and often consists of unique geometries. Feature staircases are very popular in the architectural design of institutional and commercial buildings in North America and elsewhere.
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