Design of Shallow Foundation (Isolated Footings)

Q :-

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.

ANS :-

Aim :- To design the square footing using the details provided.

Introduction :-

• Isolated footings are those that are provided independently under each column.
• They are typically rectangular, square, or circular in shape.
• PCC is used for the foundation. Termite control liquid is sprayed on the top face of the PCC before it is laid to prevent termites from damaging the footing.
• Isolated footings are used in areas where the soil-bearing capacity is generally high. They are made up of a thick slab that can be flat, stepped, or sloped.
• When compared to other types of footings, this type is the most cost-effective.

Procedure :-

RESULT :-

• Using the given details the square footing has been designed successfully.