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RE: 1/3 stress increase for 5 psf interior wind load

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Title: RE: 1/3 stress increase for 5 psf interior wind load

good question.  we have always taken the "wind and EQ" thing to mean the partition load (or any temporary short duration lateral load for that matter).

it may actually be the "leaning person" load, the leaning pile of books, the eccentric effects of wall mounted cabinets, wall mounted water closets, etc.

is the reduction for laterals really a statistical thing like the LDF in wood design ?  laterals like the fully loaded wall mounted upper cabinets may need higher than 5psf, i never really checked. . . .

i guess the real question is: what is the origin of the 5 psf to begin with (Corps of Engineers requires 10 on masonry interior partitions).  Could it be loosely based on a differential internal pressure thing like in AISC? or is it simply a good idea CYA thing ?

fwiw: i have 2 other mfr's catalogs that do the same 0.75 reduction.