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Use 9 #8 Bars <br />Area Provided 7.11 (in2) > Required Area <br />Req. Long. spacing = circumf/(# bars) Req. Long. spacing = 10.47in < 12in OK <br />Concrete Properties <br />B = Foundation Diameter 3.00 (ft) <br />fc = Concrete strength 3000 (psi) <br />concrete Design shear strength <br />Vu = vy ` vo (lbs) <br />Vu = 5428.50 <br />phiv = concrete shear Phi factor <br />phiv = 0.75 <br />Cvr = cover (in) <br />I-Dia = Longitudinal bar diameter (in) <br />SDia = stirrup diameter (in) <br />Phi ` Vc = phiv ` 2 ` (fc)A0.5 ` (B - (Cvr + LDia / 2 + SDia)) B <br />Phi ` Vc = 82815.65 (psi) <br />Phi ` VC > Vu OK <br />concrete Design Torsion strength <br />Tu = Mt ` TO (lbs) <br />Tu = 4141.50 <br />X2y = 0.1875 ` PI ` BA2 <br />X2y = 27482.6525336035 <br />Ct = ((B - (Cvr + LDia / 2 + SDia)) ` B) / X2Y <br />Phi ` TC = (0.8 ` (fc)A0.5 X2Y) / (1 + (0.4 ` Vu) / (Ct ` TU))A0.5 <br />Phi ` TC = 1106725.67 (psi) <br />Phi ` TC > Tu OK <br />33 <br />