Wind Load on Sign on Roof (~170ft High)
Wind Load on Sign on Roof (~170ft High)
(OP)
hey guys. i'm having to check an existing roof top sign. the sign is anchored on the roof structure. via a braced frame type of system. the height of the roof is about 170', and the sign is an addition 30' high or so. i'm trying to nail down the wind loads from asce 7-10, but having a hard time finding specifically what i can use. chapter 30 is of no use as the only items there are for 1) parapets, 2) overhangs, or 3) structures with a height less than 60'
any thoughts? thanks in advance.
any thoughts? thanks in advance.






RE: Wind Load on Sign on Roof (~170ft High)
RE: Wind Load on Sign on Roof (~170ft High)
thanks for the response, but my understanding is that figure is for a 'free standing' sign, which i don't think is my case. i could be very wrong however. my understanding of free stand is as though the sign is anchored by itself to grade or otherwise isolated. i figure my sign in question is a component of the building, which makes me think of using the C&C values, but i'm not sure how to apply them.
RE: Wind Load on Sign on Roof (~170ft High)
I'd consider looking at both and using the more conservative. The Cf values appear fairly similar.
RE: Wind Load on Sign on Roof (~170ft High)
RE: Wind Load on Sign on Roof (~170ft High)
If you take a closer look at the freestanding sign figure, you'll see some pretty high Cf values in the 'Case C' design area of the figure that are probably in line with C&C loading. Those are the loads I use when designing individual components on signs.
RE: Wind Load on Sign on Roof (~170ft High)
Dave
Thaidavid
RE: Wind Load on Sign on Roof (~170ft High)
RE: Wind Load on Sign on Roof (~170ft High)
RE: Wind Load on Sign on Roof (~170ft High)
RE: Wind Load on Sign on Roof (~170ft High)