Reinforcement Details In Column
The column is a very important part of buildings. Generally, they are used to transfer the load of the beams and slabs to the footing of the buildings. Therefore, it is very important to make it in a proper way, so that it can easily bear all loads which act over it. In this article, I will discuss the reinforcement details of a column.
Based on shape & size, columns may be of different types, such as rectangular, square, circular, etc.
Minimum reinforcement in column
Now, 1st thing which comes to our mind is that what should be the minimum reinforcement in a column.
i) In the case of a square column, the minimum longitudinal reinforcement should be 4 nos. As per IS code, the minimum dia of the longitudinal bar should not be less than 12 mm, and the dia of a stirrup should not be less than 8 mm. Stirrup should be placed at a distance of 150 mm (center-to-center distance).
Note: In my experience, you can also use a dia of 10 mm bar in the column if the structure is very simple and only for a height of 10 to 12 ft from the ground level. And, also the distance between the two columns should not be more than 8 ft.
ii) In the case of a rectangular column, the minimum longitudinal reinforcement should be 4 nos. The minimum dia of bars should be the same as the above-mentioned.
iii) In the case of a circular column, the minimum longitudinal reinforcement should be 6 nos. Dia of bars should be the same as the above-mentioned.
|Coloumn Type||Minimum Numbers of Longitudinal bar||Minimum dia of longitudinal bar||Dia of stirrup|
|Square column||4||12 mm||8 mm (150 mm center to center distance)|
|Rectangular column||4||12 mm||8 mm|
|circular column||6||12 mm||8 mm|
What is the Minimum Size of a Column?
The recommended minimum size of a column is 9 inc by 9 inc (9″ × 9″). But, sometimes 9 inc by 5 inc column is also used( However, it is not recommended to use)
Arrangement of Lateral Ties and Links in Column
Typically arrangement of lateral ties and links in columns are as follows:
i) Single Tie
ii) Two Tie
iii) Single Tie and Link
iv) Two Ties
v) Single Tie and Two Link
vi) Three Ties
vii) Single Tie and Three Links
viii) Three Ties
ix) Single Tie and Four Links