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Wind load on platform

Wind load on platform

Wind load on platform

(OP)
Hi everyone,

I appreciate if anybody can direct me and show me how and in what directions I need to apply wind load on these platforms?

What category of windload in the code they belong?

The platforms are 4feet wide and the longer ones is 21' and the top one is 10' long?
They are supported by the kickers back for bldg
They are covered by metal grating

If is not much of trouble showing the wind load cases on my sketch will help me to understand better.

Thank you for your help

RE: Wind load on platform

I think I'd be a bit conservative here and use overhang wind pressures and see where that puts the design. You'll want to check uplift and down force to size the kickers properly. If you're getting what seems like unreasonable results, then maybe look at using a reduced wind load based on the area of openings in the grating, but I'd start conservative.

RE: Wind load on platform

Honestly, if these were industrial (usually 100psf with some platforms down to 50psf) I wouldn't really worry about downforce and I'd do a quick check for a nominal uplift to make sure the structure you're attaching to generally has capacity. I don't really work in areas with significant wind forces, though. If you're in Florida or something, you'd obviously worry more.

For lateral force I'd use the open steel frame chart in the commentary of the national building code of Canada. I've attached them. If you find them useful I can describe the input variables. They're somewhat compatible with the ASCE-7 input values prior to the last big wind revision.

Really, though, I generally try to ensure there's a nominal lateral capacity of around 5%, sometimes 10% of the vertical capacity so that I'm comfortable and that normally ends up governing in my areas. If I'm attaching to an existing structure I don't always get that luxury.

RE: Wind load on platform

Maybe you can get some help from an experienced engineer in your office.

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