Reinforced and Plain Concrete Footing Thickness

Reinforced and plain concrete footings are commonly used to support structures on soil. The thickness of the footing at the edge is an important factor to ensure that the footing can support the load and prevent settlement. The minimum thickness at the edge is specified in various codes and standards.

Minimum Thickness at Edge

According to the Indian Standard Code of Practice for Design of Concrete Structures, the minimum thickness at the edge of reinforced or plain concrete footings resting on soils shall not be less than 15 cm. This is specified in IS 456:2000, which is the code of practice for plain and reinforced concrete in India.

Reasons for Minimum Thickness

The minimum thickness at the edge is specified to ensure that the footing can resist the loads and prevent excessive settlement. The following are some of the reasons why a minimum thickness is required:

1. Load distribution: The thickness of the footing affects the distribution of the load on the soil. A thicker footing can distribute the load over a larger area, reducing the pressure on the soil and preventing settlement.

2. Structural stability: The thickness of the footing also affects the stability of the structure. A thicker footing can provide better stability and prevent tilting or overturning of the structure.

3. Reinforcement: In case of reinforced concrete footings, a minimum thickness is required to provide adequate cover to the reinforcement. This can prevent corrosion and ensure the durability of the structure.

Conclusion

In summary, the minimum thickness at the edge of reinforced or plain concrete footings resting on soils is 15 cm according to the Indian Standard Code of Practice for Design of Concrete Structures. This is important to ensure that the footing can resist the loads and prevent excessive settlement.