Uniformly Distributed Live Loads Chart (pdf)
Live Loads
- Aka probabilistic load, includes all forces that are variable with the objects normal cycle
- ex. stair case: pressure from feet on stair treads, usage, size
- live loads do not include construction or environmental loads i.e. wind, snow, rain, earthquake, and floods
- used to calculate total loads
- safety factor
Calculating Combined Loads
- finding max for dead and adding live will give huge over estimate
- you may only combine two stress results at same point
Deflection Limits
- how much wood bends under pressure
- length in inches/360 or L/240, L.180, depends on code books, based on specific activity in room
- living room floor= L/360, 40 psf
- bedroom/inhabitable attic= L/360, 30 psf
- attic with limited storage, L/240, 10 psf
Dead Loads
- add weigh of drywall, strapping, floor joists, sub-floor, under-layment, and carpeting.
- can be found in handbooks (Architectural Graphic Stand)
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