All About size of RCC column as per IS 456

All About size of RCC column as per IS 456

RCC (Reinforced Cement Concrete) columns play a crucial role in the construction of any structure, as they provide vertical support and resist compressive forces. These columns are designed and built in accordance with codes and standards set by various governing bodies, including IS 456. One of the most important factors to consider while constructing RCC columns is their size. Proper sizing of columns is essential for ensuring structural stability and safety. In this article, we will delve into the various aspects of RCC column sizing as per IS 456, including the governing factors, design considerations, and structural implications.

Minimum size of RCC column as per IS 456

Minimum size of RCC column as per IS 456

As per IS 456:2000, the Indian Standard code of practice for plain and reinforced concrete, the minimum size of an RCC column is determined based on several factors such as the type of structure, type of load, and soil conditions.

The primary function of an RCC column is to support the weight of the structure above it, transfer the load to the foundation, and resist lateral forces. The size of the column is specified based on the load-carrying capacity and the permissible stresses as per the design code.

Size of an RCC column is defined by its cross-section dimensions. According to IS 456:2000, the minimum dimension of an RCC column shall not be less than 9 inches (or 225 mm) for a plain concrete or 9.75 inches (or 250 mm) for reinforced concrete structure. However, in practice, the size of the column is often increased to accommodate the required reinforcement and ensure better structural stability.

The minimum size for an RCC column is crucial in ensuring its structural integrity and strength. A column that is too small may not be able to resist the loads and may lead to structural failure, while an oversized column could result in the wastage of materials and increase the cost of construction.

As per IS 456, the minimum size of an RCC column is also determined based on the overall dimensions of the building. For example, for a low-rise building with a height up to 25 feet, the minimum size of an RCC column shall be 9 inches x 9 inches (or 225 mm x 225 mm). For a building with a height greater than 25 feet, the minimum size of the column shall be 12 inches x 12 inches (or 300 mm x 300 mm). However, these dimensions are subject to change based on the types of loads and the structural design.

In addition to the minimum size, IS 456 also specifies the minimum reinforcement required for an RCC column. The reinforcement should not be less than 0.8% of the cross-section area for a square column and 0.9% for a circular column.

In conclusion, the minimum size of an RCC column is an essential factor in the design and construction of a building. It ensures the structural stability and safety of the structure while also optimizing the use of materials and reducing cost. It is imperative to adhere to the design standards and guidelines as specified by the relevant codes to ensure the structural integrity of the building.


In conclusion, understanding the size of RCC columns as per IS 456 is crucial for the successful construction of any building. These columns provide the necessary support and stability to the structure, ensuring its strength and longevity. By following the guidelines and standards set by IS 456, engineers and builders can ensure the correct size of columns is used for a safe and efficient construction process. It is important to consult with experts and follow thorough planning and design to determine the appropriate size of RCC columns for different building types and conditions. Adhering to the standards set by IS 456 not only ensures the structural integrity of the building but also maintains the safety of its occupants. Therefore, it is essential to have a thorough understanding of the size of RCC columns as per


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