Roof metal deck allowable lateral deflection-Wind
Roof metal deck allowable lateral deflection-Wind
(OP)
What are the limits for horizontal/lateral deflection of metal deck under wind loading? I am checking to see if a 1.5x22 Ga deck is OK for use. Using the vulcraft deflection formulas I am coming up with 1.5" deflection at the center. The roof line height is 31' and the walls are precast. In the past I have used 2h/600 for masonry walls but I think I should be able to use higher number for precast.
Thank you.
Thank you.






RE: Roof metal deck allowable lateral deflection-Wind
With W= 463 plf @ 4.5' (k1 = 0.352, K2 = 1056, Db= 1652....36/5-1 side lap) I am ending up with 0.95" deflection on a 99'x67' roof.
Now using 5' joist spacing (K1= 0.242, K2 = 1056, Db= 1652....36/5-2 side lap) I end up with 0.85" deflection.
Shouldn't the deflection be less for the smaller joist spacing?
RE: Roof metal deck allowable lateral deflection-Wind
For industrial type structures I usually defer to AISC Design Guide 7 written by Fisher. He makes recommendations for serviceability is chapter 10 of this manual.
RE: Roof metal deck allowable lateral deflection-Wind
Thanks for the reference and yes I mean lateral deflection under wind. I did look thru that particular chapter it appears that for precast wall panels the drift limits is h/100. Seems a little too liberal to me.
RE: Roof metal deck allowable lateral deflection-Wind
I'm sure others will have opinions as well.
Inside my AISC design guide no 3 I have a stapled set of pages from Engineering Journal/ American Institute of Steel Construction First Quarter /1993 that lists a limit of H/200 for precast panels for "Wind Frame Deflection". Maybe you could look in there for some more information.
RE: Roof metal deck allowable lateral deflection-Wind
RE: Roof metal deck allowable lateral deflection-Wind