Equations for Bearing Capacity Curves
Equations for Bearing Capacity Curves
(OP)
Does anyone know where I can find empiracal equations for the bearing capacity factor curves in Peck/Hanson/Thornburn? Specifically Ngamma and Nq for shallow foundations.





RE: Equations for Bearing Capacity Curves
f-d
¡papá gordo ain’t no madre flaca!
RE: Equations for Bearing Capacity Curves
(Vesic 1973, developed by Reissner 1924)
Nq = tan^2(45+phi/2)*e^(pi*tan(phi))
(Vesic 1973, developed by Prandtl 1921)
Nc = (Nq-1)*cot(phi)
(Caquot & Kerisel 1953, Vesic 1973)
Ng = 2*(Nq+1)*tan(phi)
These are the relations used by AASHTO. Other possibilities mentioned in Das are (use the expression for Nq given above in the expressions below):
(Meyerhof 1963)
Ng = (Nq-1)*tan(1.4*phi)
(Hansen 1970)
Nq = 1.5*(Nq-1)*tan(phi)
Hope this helps.
Jeff