Unreinforced Concrete footing
Unreinforced Concrete footing
(OP)
Fellers,
can someone point me in the right direction for info on designing unreinforced concrete footins for a steel column load?
thanks
Tracy
can someone point me in the right direction for info on designing unreinforced concrete footins for a steel column load?
thanks
Tracy






RE: Unreinforced Concrete footing
Note, phi for plain concrete is 0.65.
RE: Unreinforced Concrete footing
thanks!
RE: Unreinforced Concrete footing
I'd size my thickness based on a 45degree spread of the load from the plate through the footing, and I'd check the bending as for mass concrete, with root Fc' (square root of my strength of concrete) being my limiting strength for the tension capacity of concrete.
I think I've got a (very) old paper on this from the family library; I'll see if I can dig one up.
Cheers,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Unreinforced Concrete footing
StructuralEIT says to use phi=0.65 for plain concrete. Not sure if that is right. In ACI318-02, it's 0.55. In ACI318-08 it's 0.6. I don't have ACI318-05, so he may be right for -05.
RE: Unreinforced Concrete footing