Which of the following statements are true in the design of colum
Which of the following statements are true in the design of columns according to IS 456:2000
A. Minimum Area of steel in longitudinal reinforcement is 8 % of Gross area of column
B. Minimum Area of steel in longitudinal reinforcement is 0.8 % of gross area of column
C. Minimum number of bars for reinforcement in longitudinal reinforcement for rectangular column is 6
D. Maximum area of steel in longitudinal reinforcement when bars are not lapped is 6 % of Gross area of column.
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Right Answer is:
SOLUTION
Concept
As per IS 456: 2000, clause 26.5.3.1,
Longitudinal reinforcement in a column:
The minimum number of longitudinal bar:
The minimum number of the longitudinal bar provided in column shall be
- four in rectangular columns
- six in circular columns
Percentage of steel:
The cross-sectional area of longitudinal reinforcement shall be not less than 0.8 % nor more than 6 % of the gross cross-sectional area of the column.
The minimum diameter of longitudinal reinforcement bars:
The main longitudinal reinforcement bars used in column shall not be less than 12 mm in diameter.
Helical reinforcement:
A reinforced concrete column having helical reinforcement shall have at least six bar of longitudinal reinforcement within the helical reinforcement.
Spacing:
The spacing of longitudinal bars measured along the periphery of the column shall not exceed 300 mm.
∴ Option 2 and 4 are correct