Banner Wind Loads 1

[SteelPE]

I have a client that wants to hang a banner from the side of an existing building. The banner is supported at the top and bottom and is 4’ wide x 20’ tall. The code to be used is ASCE7-05. My question is which wind load section on ASCE 7-05 does this fall under? I am guessing section 6.5.15 as the sign is not freestanding.

 

[JAE]

I don't see this a sign - a rectangular vertical plate sticking out of or above the ground. I would look at C&C wall loads.

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[azcats]

ASCE 7-10 has a section (29.4.2) on solid attached signs that reverts to C&C loads with the internal pressure coefficient set to 0. Is your sign on or close to the building wall?

 

[SteelPE]

JAE,

WOW posting at 12:00 am that's dedication.

azcats

Yes, these will be close to the building, about 4' away to the outer edge max. I didn't get a chance to look at ASCE7-10 to see if there was any clarification. I'm surprised they use C&C loading with the internal pressure set to 0 as I think that would give you lower wind loads.

 

[TehMightyEngineer]

Second the above comment, this should use the C&C load for the building in my mind. Probably a lot of engineering judgement involved in using even those loads for this application, though. I imagine that unless this is pulled really tight, any "flapping" of the banner can cause some pretty extreme loads in the banner and its anchorage.

Maine Professional and Structural Engineer
American Concrete Industries

http://www.americanconcrete.com

 

[azcats]

SteelPE - I believe that section only applies to signs 3' or less away from the building face...so the lower loads somewhat make sense.