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Re: CMU Stair/Elevator Shaft

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Jim,

If you have floor on all 4 sides, then 8 inch is no problem. Frequently, one or two sides of a stair tower are on the outside, and then the wall needs to span horizontally or a bond beam at each floor level is required for transfer of out-of-plane loading. Even a 16 foot stair chase can get interesting if you are trying to span as a bond beam at the floor line, though it is not difficult to span the wall horizontally. Typical behavior for a stair enclosure is to span horizontally anyway, especially the short walls. Real problems can develop if one of the un-supported sides is retaining.

Obviously someone sold them on the need for 12 inch for a specific application, and they now use this as a standard. I would not complain too much, at least they are not thinking the entire thing can be 6 inch. :-)


Paul Feather PE, SE
www.SE-Solutions.net
pfeather(--nospam--at)SE-Solutions.net
----- Original Message ----- From: "Jim Wilson" <wilsonengineers(--nospam--at)yahoo.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Monday, July 11, 2005 8:09 AM
Subject: CMU Stair/Elevator Shaft


Just curious, is there any reason why a CMU stairway
inside a steel building would have to be or should be
any greater than 8" thick?  Fire rating is not an
issue and the block theoretically leans on the steel
for lateral loads.  The building is only 3 stories
tall.

Jim Wilson, PE
Stroudsburg, PA

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