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RE: BILLBOARD SIGN DEFLECTION CRITERIA

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At 13:12 09/10/97 -0700, you wrote:
>
>Section 9 of AASHTO's "Standard Specifications for Structural Supports
>for Highway Signs, Luminaires and Traffic Signals" manual has a
>discussion on deflections that might be useful to you. It's only one
>page long and I can fax a copy to you if you would like.
>
>Calvin Lee, P.E.
>City of Portland, Oregon
>
>> I have a billboard with two flagpole type column supports.  The sign
>> has 
>> about 450 square feet of surface about 20 feet up in the air.
>> 
>> 1.  Does anyone have any recommended deflection criteria for
>> billboards? 
>>  The sign I'm looking at will have people around it most of the time.
>> I 
>> think AASHTO has a code on it, but I can't find it right now.  I know
>> you do 
>> not want the vibration to be perceptible in moderate winds (say 30
>> mph), yet 
>> probably will accept perceptable deflection for maximum wind (70 +
>> mph).
>> 
>> 2.  Does anyone have names & phone numbers & contact person for
>> billboard 
>> sign manufacturers.  I can find flagpoles in Sweet's (10350), but not 
>> billboards.  I've heard that the flagpole supports are tapered partly 
>> because it damps out any potential resonance (variable moment of
>> inertia = 
>> variable natural period) under wind loading.  I wanted to call and
>> learn 
>> more.
>> 
>> 
>> Thanks
>> 
>> Steve Uthoff, S.E.
>> 

May I have a scanned copy in a computer file of this page?

thanks,

Glauco de Deus Ribeiro
glauco(--nospam--at)cenpes.petrobras.com.br