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Perforated Metal Cladding - Partially Enclosed?

Perforated Metal Cladding - Partially Enclosed?

Perforated Metal Cladding - Partially Enclosed?

(OP)
Actually, I have two questions.  

The first is specifically the design fo the cladding itself.  applying pur bending assumptions to the system results in extremely thick plates.  I expect it to behave more like a net - in tension - but I'm uncertain of how to approach this via calculation.  

The main question here, however, is whether the openness of a 15% open cladding could - placed on both side of a structure - would create a case for partially enclosed.  

To be specific, it is a monoslope canopy spanning between two closed structures, with this 15% open metal cladding on each end.  The Open metal is not attached to our structure (the canopy).  One side has roughly 56% more opennings than the other.  

On one side, I would think the wind would flow freely through the holes (1" to 1/2" in diameter) and build up in the interior of the structure with less area to escape.  

on the other side I see the argument that wind will not flow freely thru the system (acting like a typical hurricane barrier), and therefore what ever does get inside will be low pressure and easily pass through the area at the other end.  I beleive this to be the case, but I would rather have backup in the event that it is questioned.  

Is anyone aware of any test data that may conclude such a case, one way or the other?

P.S. the difference in the resulting wind loadings for this case is a staggering 38PSF difference between ecnlosed vs partially enclosed... so the question is pretty important.  

thank you

 

RE: Perforated Metal Cladding - Partially Enclosed?

If 15% exceeds 4 square feet, then yes...partially enclosed.

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