Very Urgent- Regarding deflection control of Poly carbonate Partition

[Arbu]

Dear All,


I am designing a poly carbonate sheet partition which is having a height of 2.8 m in car wash area. Polycarbonate sheet has been supported by Square hollow section of size 80x 80 x 2 mm SS materiel at every 2 m of spacing. Problem with contractor is he already fabricated the Box supporting poly carbonate. Now consultant is asking to prove that partition is safe for 1 kpa wind. contractor asked to design or give some solution for this without changing already fabricated box. I had suggested to Reinforce the SHS by a another MS SHS 75x75x12 mm. When I am reinforcing strength wise its safe, but its deflecting more than L/180 (BS5950-1 Cantilever beam).
I need some suggestion to improve serviceability without changing the external 80x80x2 mm SHS, is it possible? I don't think so there is any option other than increasing the box. Or any one knows reference clause in any European or American standard which will allow lateral deflection L/60 or L/100 for partition like this. Please comment.

 

[Agent666]

Is the 1kPa an ultimate wind, or the serviceability wind pressure?

Sometimes I like to think, if its purely a visual thing, and the deflection isn't going to make the infill polycarbonate fall out or it hit/damage some other primary structure or something similar, then who might be around to see it? Personally I'm not washing my car during a hurricane, so who cares if it deflects to much as no one will be there to see it, provided its not permanent deformation and there is no concern with the strength under ultimate limit state loads.

They asked you to confirm its SAFE, therefore have you not already done that if it has sufficient strength. Deflection for this item is not associated with structural safety or life safety in my opinion.

 

[dik]

Pre engineered buildings often go to L/90 for deflection... The Metal Building System Association may have a recommended standard Is the l/180 based on any criteria? Will anything be harmed/damaged if the deflection is greater? Is there a reason for the high load? It's twice what a normal partition would be designed for.

Dik