This calculator assists in the design of isolated square footings for vertical vessels. It performs the following stability checks:

• Overturning Check
• Sliding Check
• Eccentricity Check
• Base Pressure Check

The following design checks are also performed by the calculator:

• Flexural Requirement Check
• One-Way Shear Check
• Punching Shear Check

Stability Load Combination

The stability checks are performed under the following service load combinations:

• Case 1: Total Dead Load + Equipment Hydrotest Weight
• Case 2: Total Dead Load + Equipment Empty Weight + Wind
• Case 3: Total Dead Load + Equipment Operating Weight + Seismic

Design Load Combinations

Design calculations are performed under the following load combinations:

• Case 101: 1.4 × Total Dead Load + 1.4 × Equipment Hydrotest Weight
• Case 102: 1.2 × Total Dead Load + 1.2 × Equipment Empty Weight + Wind
• Case 103: 1.2 × Total Dead Load + 1.2 × Equipment Operating Weight + Wind
• Case 104: 1.2 × Total Dead Load + 1.2 × Equipment Operating Weight + Seismic

Limitations

• The footing and pedestal are assumed to have a square shape.
• To avoid negative pressure, the eccentricity is limited to L/6. Although values between L/6 < e < L/3 may be allowed, for simplicity, this calculation is limited to L/6.
• Qoptimized is not calculated based on the effective area.
• Uplift is not considered, which means there is no water table issue in the constructed area.
• Pedetal is not designed in this calculator

For a detailed design procedure, refer to my previous post: “https://knowledgesharingplatform.com/vertical-vessel-foundation-design-guidelines/”