Neil Moore, SE, SECB
At 09:15 AM 2/29/2008, you wrote:
A "dynamic" analysis for a billboard.... Tomfoolery at its highest...
On Fri, Feb 29, 2008 at 5:00 AM, Gary L. Hodgson and Assoc. <ghodgson@bellnet.ca> wrote:
- Thanks, Harold
- I will be doing that. There is no guidance in our codes on signs or
- other non-building structures. Your codes go further than ours, as ours
- are only written in regard to buildings. If I want to design a crane
- runway, storage bin, or sign _for seismic loads_, I have to refer to
- American publications. The problem is that our codes don't use the same
- terms or geographical data.
- In going up against this municipality, I have to be on firm footing,
- because my customer has a history of bad relations with them--he has won
- two law suits against the city and their three page letter (of
- structural questions only) came two days after the latest judgement was
- published in the newspaper. This city has the first or second highest
- average income in Canada and they don't like billboard signs, even if
- though there a lot of them existing in the city. One of the questions
- was "did I do a dynamic analysis of the structure" (for a 20'x10' sign
- with a top at 25' above grade).
- Gary
- How many cases of beer do I owe you now?
- Harold Sprague wrote:
- > Gary,
- > 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.
- >
- > Regards,
- > Harold Sprague
- >
- > > Date: Thu, 28 Feb 2008 17:04:42 -0500
- > > From: ghodgson@bellnet.ca
- > > To: seaint@seaint.org
- > > 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
- >
- > ------------------------------------------------------------------------
- > Need to know the score, the latest news, or you need your Hotmail®-get
- > your "fix". Check it out. < http://www.msnmobilefix.com/Default.aspx>
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David Topete, SE