Drag loads on corrugated metal roofing and siding
Drag loads on corrugated metal roofing and siding
(OP)
Is there a way know how much load should be applied to parallel-to-wind surfaces of a building system when the cladding is corrugated metal? My question specifically relates to wind acting parallel with the ridge of a building. The load has to be more than the wind pressure acting on the cross-sectional width of the building I believe, but not sure how to consider that. Does anybody know how something like that can be figured? Is it some "surface roughness" characteristics that can or should be considered? Is there a ratio of cross-sectional endwall area to length of building that could be utilized?
And then................what if the sidewalls of the building are open? How does wing load hitting the webs and chords of trusses impact the overall lateral loading on a building? To sum up the surface area of every truss in the building and apply load over that area seems overkill as no doubt there would be lots of turbulence created as wind would rush through the trusses. Not sure how to think about that either.
Any thoughts would be appreciated.
And then................what if the sidewalls of the building are open? How does wing load hitting the webs and chords of trusses impact the overall lateral loading on a building? To sum up the surface area of every truss in the building and apply load over that area seems overkill as no doubt there would be lots of turbulence created as wind would rush through the trusses. Not sure how to think about that either.
Any thoughts would be appreciated.






RE: Drag loads on corrugated metal roofing and siding
With that said, I don't know of a code-prescribed way to calculate the added effect you could have from wind coming in at an upward angle and hitting more than one roof beam. I think letter of the law you could just do projected area. But I wouldn't do that. I'd look at the loads and use judgment based on what the calculated load is for one projected surface, and then the whole surface assuming it was closed off. Based on those numbers, I'd start to see where I was at and make an assumption at that point.
One other thing is you could contact your local PEMB engineer. THey do open buildings all the time and might have insight into their industry standards.
RE: Drag loads on corrugated metal roofing and siding
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Drag loads on corrugated metal roofing and siding
RE: Drag loads on corrugated metal roofing and siding
Thanks for the lead on how the Australian code handles wind frictional forces.
Dave
Thaidavid
RE: Drag loads on corrugated metal roofing and siding
OP - I'll scan the relevant page from our portal frame bible in the morning for your reference.
RE: Drag loads on corrugated metal roofing and siding