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Design of Shallow Foundations (isolated footing) AIM:To design a square footing for a column size of 400x400 for given constraints and do the following check:• If the gross bearing pressure under the footing is within safe bearing capacity Provide sufficient depth and longitudinal steel for resisting bending…
Aditya Bhute
updated on 20 Oct 2022
Design of Shallow Foundations (isolated footing)
AIM:
To design a square footing for a column size of 400x400 for given constraints and do the following check:
• 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 the column-footing joint is within 0.45 times the maximum concrete compressive strength.
Also, to provide a sketch showing the details of geometric and structural features of footing.
INTRODUCTION:
• Footing is a part of the foundation which is constructed with concrete or brickwork masonry and acts as a base for the floor columns and floor walls.
• The main function of footing is to transfer the vertical loads directly to the soil.
• The four main types of footing are strip/wall footing, spread footing, combined footing, and raft footing.
• A wall footing or strip footing is a continuous strip of concrete that serves to spread the weight of a load-bearing wall across an area of soil.
• Spread footing is a pad that distributes the column load in 2 directions to an area of soil around the column. It can be stepped, tapered, etc.
• Combined footing is provided when two columns are closely placed or when the column is at the property line.
• Raft footing is provided for very weak soil or when the area of the overall column to the area of the site footprint exceeds 50%.
• Isolated footing is an individual footing that transfers the load to the underground soil. It is provided when a single column is to be provided.
TASK -
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 meters 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:
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.
PROCEDURE:
Here a sloped footing is designed.
Reinforcement Bars Placement Plan
Section of the Footing
RESULT:
Sloped isolated footing for the square column is designed for the given conditions and also checked.
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