Design of Square Column Footing

Required Steps

• Area of footing determination
• Soil reaction
• Factor Moment
• Required footing depth (ie. thickness of footing)

Step One: Area of Footing

A = ((10% of P) + P) / SBC A = ((0.1 x) + ) / A = NaNm²

Footing size = √A

Footing size = √NaN = NaNm ≈ NaNm

Step Two: Soil Reaction

q_u = P_u / A

q_u = 1.5P / A

q_u = 1.5 x NaN / NaN = NaNKN/m²

Step Three: Factor Moment

M_u = (PB((L- D) / 2)²) / 2

M_u = (NaN x x ((NaN- ) / 2)²) / 2

= NaNKNm

Step Four: Required Footing Depth d

d = √M_u / (0.138f_ckB) = NaNmm

d = √NaN x 10⁶/ (0.138 x x NaN) = NaNmm