Inputs
kN
kN
kPa
mm (square col.)
mm
mm
MPa
MPa
mm
Notes & assumptions
- Loads are service; factored Pu = 1.2D + 1.6L. Self-weight of footing ignored in q_a check (typical for light footings — increase D as needed).
- Effective d = h − cover − 1.5·d_b (average two layers of bottom mat).
- One-way shear: Vc = 0.17·λ·√f'c·b·d. Two-way: Vc = min[0.17(1+2/β), 0.083(αs·d/bo+2), 0.33] · √f'c·bo·d.
- φ_v = 0.75; α_s = 40 (interior column).
- Square footing assumed unless rectangular selected (uses given B and computed L from B·L = Areq).
Results
P_factored (P_u)—
Required Footing Area—
Required B (square)—
q_u (factored bearing)—
Effective d—
One-way shear demand / capacity—
Two-way (punching) demand / capacity—
Bending moment Mu (per m)—
As,req per direction—
Suggested mat—
Overall statusOK