Isolated Footing Design Example
Complete isolated spread footing design example per ACI 318-19 §13.3. Sizes the footing on soil bearing, checks one-way shear, punching shear, and designs the flexural reinforcement including minimum steel.
Given Parameters
column axial load
service load for sizing
square column
allowable soil bearing (service)
materials
effective depth; total thickness
Calculation Steps
1. Size Footing on Service Load
2. Net Factored Soil Pressure
3. One-Way Shear Check (at d from column face)
4. Punching Shear Check
5. Flexural Design (at column face)
Governing Check — Punching Shear
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