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Allwable lateral defelction of stud walls and wind columns

Allwable lateral defelction of stud walls and wind columns

Allwable lateral defelction of stud walls and wind columns

(OP)
Is there any Code or Standard that specifies the maximum allowable lateral deflection of wood stud walls and wood columns under wind load, where the wall has a brittle finish such as plaster or gypsum board (drywall)? I would have thought that the limit would be L/360, but to my surprise that limit seems to be only for live load on floors/roofs supporting plaster ceilings, and not for wind loads on walls and wind columns, at least as far as I can find in the National Building Code of Canada, and CSA 086.1 "Engineering Design in Wood". I am particularly interested in wood at the moment.

RE: Allwable lateral defelction of stud walls and wind columns

L/360 for stucco and plaster finishes
L/240 for other brittle finishes
L/120 for flexible finishes

this is due to snow or wind load.

RE: Allwable lateral defelction of stud walls and wind columns

The deflection limit table in Chapter 16 of the IBC gives this info (the same values Jerehmy notes). IBC also allows 70% of the component/cladding design wind loads to be used for deflection calculation.

RE: Allwable lateral defelction of stud walls and wind columns

(OP)
Thank you both very much for this information. Very interesting.

RE: Allwable lateral defelction of stud walls and wind columns

Be careful with the 70% reduction - that only applied to the ASCE7-05 loads - reduction is different with ASCE7-10 strength level loads.

RE: Allwable lateral defelction of stud walls and wind columns

The NBCC Allows you to use a Iw of 0.75 for service loads so that mimics the IBC.

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