Design Software

Combined Footing Design — Two Columns

Rectangular combined footings supporting two columns per ACI 318-25 §13.3.4 and Wight & MacGregor 7e §15-6. Computes the resultant of the column loads, sizes the footing for uniform soil pressure, runs a full beam analysis (BMD + SFD with two factored point loads + distributed soil reaction), then checks two-way shear at each column, one-way shear, longitudinal flexure (positive at cantilever / negative between columns), and transverse flexure under each column. Cross-validated against Wight Ex 15-5 within 3% on every quantity.

✗

Combined footing FAILS — 4 issue(s)qnu = 283.5 kPa · |Mu−| = 2815.4 kN·m · Mu+ = 708.3 kN·m

Footing geometry (mm)

L — longitudinal length (mm)B — transverse width (mm)T — thickness (mm)Clear cover (mm)Embedment (mm)

Soil

qa — allowable bearing (kPa)γs (kN/m³)γc (kN/m³)

Materials (MPa)

f′cfyλ (lightweight)

Column 1 (typically exterior)

Shapecl — along L (mm)ct — along B (mm)PD (kN)PL (kN)Position along L (mm)Location (αs)

Column 2 (typically interior)

Shapecl — along L (mm)PD (kN)PL (kN)Position along L (mm)Location (αs)

Reinforcement

Bottom-long barBottom-long countTop-long barTop-long countBottom-trans barBottom-trans count

Print branding (your firm)

Optional. Logo + company name + tagline appear on the print-report cover page.

Company nameTagline / project refLogo (PNG/SVG)

Warnings

Longitudinal one-way shear fails (ratio 1.26).
Negative-moment flexure fails — increase top-long bars.
Transverse flexure at column 1 fails.
Transverse flexure at column 2 fails.