wind design
 

wind design
ok, lets say you have 40'x40'x60' tall building. on the top of building you have parapet that is 30'x20'x15' tall.
so, when i design the components and cladding on the parapet, what is a? (10% of least horizontal dimension). is it the 40' or 20'?
p.s. why is that all of the examples are always simple blocks when in reality it is not .
never, but never question engineer's judgement
check out our whitepaper library.
the 10% least horizontal dimension, as i understand it, is with respect to the building. so this would apply to the 4 ft from the edge of the building. if the 30' parapet is centered on the building, then the 10% would not apply to the parapet.
assuming your "parapet" is actually a screen wall (i gather that from your description, since a typical parapet would not be 15' tall), then i would use the 40' dimension.
yes a screen wall, but i have to design it like a parapet.
never, but never question engineer's judgement
coenginner
if you continue on in that section it also gives minimums, so any way 10% of 20 ft is 2 ft. 10% of 40 ft is 4 ft, and as stated in that section the minimum is 3ft. i would use 4ft for a (40ft length) and move on.
jb