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RE: Sign Structures

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The projected area in the plane of the sign is relatively small.  Seismic may govern.  You could categorize signs as nonbuilding structures.  The loading is a function of the force resisting system which establishes the response coefficient and the mass. 

Harold Sprague

> Date: Thu, 28 Feb 2008 17:04:42 -0500
> From: ghodgson(--nospam--at)
> To: seaint(--nospam--at)
> Subject: Sign Structures
> List,
> I design sign structures for 2 clients-these are all free-standing signs
> on one or two posts. In our area, generally wind governs. A
> municipality has questioned whether I designed a particular sign for
> seismic loading. Nothing in our codes addresses the issue of signs
> subject to seismic loading unless they are part of a building, in which
> case they are considered a fixture just like a mechanical piece of
> equipment. Our codes only require that signs over a certain height or
> area have to be designed by a professional engineer. So, I guess my
> question is what seismic loading do you design signs for? Thanks in
> advance.
> Gary

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