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Hello, Good evening to everyone. I am designing a strip footing for two storey building. I prepared the model in etabs. I got the support reaction and from that i calculated the strip width = 6' When i made a Shear diagram using the support reactions (acting downward as point loads) and soil pressure (acting upward as UDL) i got value of critical shear = 108 Kips and one way shear capacity = phi*2*Sqrt(fc')bwd = 68.5 kips for? foundation thickness = 15 inches ... is that right, i mean do we need to calculate one way shear in such cases ? and i got some abnormal kind shear force diagram why is that so? in some point it only goes upward (positive values) - anyway where i am getting wrong? Bearing capacity = 0.6tsf = 1.32 ksf
