Tag Archives: pole barn wind speed

Wind Speed

Just Another Windy Conversation

Hansen Pole Buildings’ Designer Rick asked me this question today: “Mike, I got a guy who wants to compare an over wind rated building to a Quonset hut at 150 mph” (miles per hour).

Of course I jump right onto this one off the get go, “So the Quonset people have an engineer’s seal on a 150 mph building?” (Just call me a skeptic) “And even if they do – how functional is a Quonset hut?”

I’ve pointed out some Quonset challenges in a previous article: https://www.hansenpolebuildings.com/blog/2011/07/quonset-huts/

Rick, “I’ll check it, but for now I am about to call this guy back, the question is how high can I go up on the wind load and be reasonable?”

Hansen Pole Buildings has created a proprietary pole building design and pricing program which does some truly amazing things….but Rick had me stumped with this one!

retail-pole-barnFor this particular client’s building site the Code wind speed design would be for 90 mph. There is a nifty little formula to convert mph to wind pressure (.00256 X wind speed squared). This makes a 150 mph wind speed applying 277% of the load force of 90 mph.

On this particular 40’ x 60’ x 13’ pole building, the difference in investment for the 277% more force….?

Under 20% more!!

On many pole buildings, designing for extra wind resistance is minimal. For anyone considering a new building, I would certainly encourage them, at the least, to investigate an increase of 10 or 20 mph, at the least.

Next Rick decided to try a 200 mph wind speed (even though no Building Department anywhere in the United States has this requirement). We are now talking wind speeds only an EF-5 tornado would surpass!

Not surprising – our program would design the building…..at 200 mph!!

The sidebar to this story…..

The client wants to be able to pull a trailer out of his new building to live in if his house goes down!