need to find the wind load for pole and base for a 4'x8' 12" cabinet on a 15' pole with the base of the cabinet being 11' from the blacktop? Any help would be appreciated. Thanks
Posted by Chuck Sartoris (Member # 3466) on :
I need it for a 90 MPH wind for 3 seconds.
Posted by Checkers (Member # 63) on :
Checkers
Posted by Rene Giroux (Member # 4980) on :
As a rule of thumb, I have this quick little pocket guide. Of course, if you're planning to install a huge structure over a busy sidewalk, hire an engineer but for smaller sized signs this might work.
Wind loads vary from place to place, so there's no golden rule that applies to all. Find a similar sign that's been there for 30 years and look at what they used for a pole, bolt and plate size. Make sure the pole goes through and to the top and if not sure check out a slightly larger sign.... don't over think this!
Posted by Chuck Sartoris (Member # 3466) on :
It is an exhisting pole that had twice the square footage of sign on it before. The township ordinance man wants a wind load for 3 seconds @ 90 mph. The pole and base is more than adequet to sustain the new sign. All I need is a graph or architects wind load seal of approval. My question is .Where do I find a formula that says the pole has to be 7"x7 x1/4" and the base has to be 27"x28" x72". This is the exact measurements that is there now. If it is over that they will accept it.
Posted by David Harding (Member # 108) on :
If they got approved engineering for the same wind loading on the structure for the previous cabinet and the new one has less area and a center of pressure at or below that of the old cabinet, then they have all they need. It's already over engineered.
There is an engineering axiom that states to the effect: "If you build a bridge so that an elephant can cross it, you don't have to re-engineer it for a mouse."
Posted by Rene Giroux (Member # 4980) on :
Yeah Dave.... unless it creates 3 jobs !
GR V
[ April 23, 2008, 09:10 PM: Message edited by: Rene Giroux ]
Posted by Dave Sherby (Member # 698) on :
I'm confused. It looks like you have a vertical 4x8 with the pole going up inside the sign cabinet to the half way point? Let me know which way the 8 foot dimension is running and how high it is to the middle of the sign. The height to the middle of the sign is the figure I need to plug into the formula and I can tell you the steel size you'll need for 100 mph wind. That is the average standard across most of the country and will work for you. Do you need the concrete base size too? Are you burying the pole in the concrete or using bolts? If you're using bolts you also need base plate thickness and size and number of bolts.
Posted by Chuck Sartoris (Member # 3466) on :
Sign Size: 4’ x 8’ = 32sqft 8' horizontal
Pole: 7” diameter
Base Bolts: 1 1/8” diameter, quantity 4
Base: Concrete 28” x 27” x 72”
Sign Height: Top-15’, Bottom- 11’ from pavement
seems that the township had adopted the universal national building code or some crap like that and will not issue a permit without a ENGINEERS STAMP on a wind load report. The fact that it held 57% more signage in sq ft before has no bearing on their actions. I need that STAMPED report. Bastards! So just be very careful on sign install applications. Now I need a copy of contracts with (Permits and Pulling Permits) lines..
![[Smile]](smile.gif)
![[Cool]](cool.gif)