Lightly loaded foundation design
Lightly loaded foundation design
(OP)
For a two story wood framed home I am designing a spread footing per the soils report. The maximum P(dead)+P(live)=1500 plf. The maximum point loads at the corners of the shear walls due to lateral loads is a 1300lb couple and occur at various loations along the foundation. How do these point loads factor into the ASD equations P dead + P live + (P wind or seismic) in order to detrermine the governing condition.
Thanks
Thanks






RE: Lightly loaded foundation design
I don't know how stringent your local Plans checkers are. I would make the wall footing about 20" - 22" wide, reinforce the footing and stemwall with 0.002 x Ag, and blow off the point loads due to shearwall reactions. The Code reqirements are geared more toward commercial buildings. In fact, the IRC Residential Code gives prescriptive requirements, but those usually don't apply unless you have all the qualifying elements in place.
RE: Lightly loaded foundation design
RE: Lightly loaded foundation design
No footing reinforcing is required if the soil is not expansive or is densely packed.
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RE: Lightly loaded foundation design
I was referring to the continuous wall footing, to take the shear wall reaction without providing a spread footing at the hold down.
If you don't use reinforcing in continuous wall footing/stem, I hope you have your E&O premiums all paid up.