Design of Shallow Foundation (Isolated Footings)

Aim: Design a square footing for a column size of 400x400. The compression axial load for the load combination of (1.5 DL + 1.5 LL) is 2000 KN. The safe soil bearing capacity is 150 KN/m2 at a depth of 2 metres below E.G.L. Participants are free to go for either a tapered or stepped footing. Besides the total axial load, also account for the self-weight of the footing and soil above it. Assume M25 concrete grade. Do the following checks:

• If the gross bearing pressure under the footing is within safe bearing capacity
• Provide sufficient depth and longitudinal steel for resisting bending and shear
• Sufficient anchorage for column steel into the footing
• If the bearing pressure at column-footing joint is within 0.45 times the maximum concrete compressive strength

Provide a simple sketch showing the size of the footing, maximum and minimum depth of the section, flexural reinforcement in both directions and anchorage of column steel.

Introduction:

Steps involved in the footing design:

• Determine the design of the footing
• Net Upward Pressure calculation
• Depth of the footing on the basis of Bending moment
• Area of reinforcement
• Check for One-way shear
• Check for Two-way shear

Answer:

Result:

The Square Footing is designed Successfully by using given data and code provided.