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Wind Loads on T-Shaped Canopy

Wind Loads on T-Shaped Canopy

Wind Loads on T-Shaped Canopy

(OP)
I apologize in advance for being vague as I am just stating this...

I'm calculating wind loads (ASCE 7) for a T-shaped canopy and would like some thoughts of others. Canopy has a series of T-shaped frames.

The main issue I am having trouble with is that in all directions, the canopy has very little horizontal projection which sees wind.

The roof structure sees uplift pressures but with the structure being symmetrical there is really no overturning caused by the roof pressures.

Are there some other combination or provisions I should be following that would be similar to unbalanced snow for wind?  

RE: Wind Loads on T-Shaped Canopy

Look at ASCE 7-10 pp 267- 270. This has design notes for Free roofs. I would try using monoslope free roof with 0 (zero) roof angle.

The Corps of Engineers have some design guides for open structures, but I can't locate it right now.  

RE: Wind Loads on T-Shaped Canopy

MBMA 2010 also describes a method for calculating wind loads on a "bare frame" structure with only a roof.  It looks like it is a free download at http://www.mbmamanual.com/

RE: Wind Loads on T-Shaped Canopy

TJ....have done lots of "Tee" bents like this.  If you consider the wind along the "ridge", you have a balanced condition. Wind perpendicular to the ridge will result in an unbalanced condition.

I realize there is no "ridge", but same concept.

Whoofbang is correct.  This is the correct procedure to use. Also, when the column deflects, the wind load will increase because of the exposure change.

RE: Wind Loads on T-Shaped Canopy

(OP)
Ron-
Is the unbalanced condition from the pressure varying as you go back away from the eve? I am trying to recall from memory (on road, no books)
 

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