Correct option is C
According to clause 2b.5.3.1 d of IS 456-2000, minimum die of longitudinal bar in RCC column shall not be less than 12 mm.
In reinforced concrete design, columns are crucial structural elements that carry loads from beams and slabs to the foundation. The longitudinal bars (main reinforcement) in a column provide the necessary strength and stability to resist compressive loads.
Minimum Diameter Requirement:
According to standard design codes and practices, the minimum diameter of longitudinal bars used in columns is typically 12 mm. This requirement ensures that the bars have adequate strength to resist the loads and stresses experienced by the column.
Using bars smaller than 12 mm in diameter may not provide sufficient strength and may also make it difficult to achieve proper concrete cover and placement.
