Isolated RC Footing Design

Design Inputs
Material
N/mm²
N/mm²
Column
mm
mm
Factored Loads at Column Base
kN
kNm
kNm
kN/m²
Footing Geometry
m
Suggested → B = — m   L = — m
mm
mm
mm
mm
Pu, Mux, Muy are factored (ultimate) values. Service loads = factored ÷ 1.5, used for SBC check only. Structural design uses factored loads throughout.
B or D set manually — optimization paused. Clear field to re-enable auto-sizing.
SBC Punching Shear Flexure Bearing

Summary

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IS 456:2000 — Design Basis
  • Punching perimeter at d/2 from column face; uses average d = (dL+dB)/2 per RCDC/IS 456 Cl. 31.6.3.
  • One-way shear critical at d from column face. dL used for L-dir, dB for B-dir (Cl. 34.2.4).
  • Min steel = 0.12% × width × D (overall depth), Cl. 26.5.2.1 (HYSD).
  • Bearing: σperm = 0.45·fck·√(A1/A2) ≤ 0.9·fck, Cl. 34.4.
  • Eccentricity should be within the "middle third" (e ≤ L/6 and e ≤ B/6) to prevent uplift.

Drawings

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Plan View
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Section A–A
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L-bars as circles (bottom layer); B-bars as horizontal line. Section A–A cuts perpendicular to L-direction.

Step-by-step Calculations

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Disclaimer — Based on IS 456:2000. For preliminary guidance only. Results must be reviewed by a licensed structural engineer before use in construction.  |  civikruti.com