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A rectangular column 300 mm × 300 mm size and 5 m long is restrained in position and direction at both ends. The recommended value of it's effective length is______.
  • a)
    5 m
  • b)
    4 m
  • c)
    2.5 m
  • d)
    3.25 m
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A rectangular column 300 mm × 300 mm size and 5 m long is restra...
Concept:
As per IS 456: 2000, Table 28
The recommended value of the effective length of the column effectively held in position and restrained in directions (or against rotation) at both ends is 0.65 times the length of the column.
Calculation:
Given data:
Rectangular column size = 300 mm × 300 mm
Length of column (L) = 5 m
The effective length of a given column (Leff) = 0.65 × L
The effective length of a given column (Leff) = 0.65 × 5 = 3.25 m
The effective length of a given column (Leff) = 3.25 m
The effective length of the column is 3.25 m.
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Community Answer
A rectangular column 300 mm × 300 mm size and 5 m long is restra...
Understanding Effective Length of a Column
The effective length of a column is a crucial factor in structural engineering, as it affects the column's buckling behavior. In this case, we have a rectangular column that is restrained at both ends.
Key Factors Influencing Effective Length:
- Type of Restraint: Since the column is restrained in both position and direction at both ends, it is classified as a fixed-fixed column.
- Effective Length Calculation: For fixed-fixed columns, the effective length is typically taken as half of the actual length of the column.
Calculation Details:
- Actual Length of the Column: The column is 5 m long.
- Effective Length for Fixed-Fixed Column:
- Formula: Effective Length = Actual Length / 2
- Calculation: Effective Length = 5 m / 2 = 2.5 m
Conclusion:
Given the classification of the column and the restraints at both ends, the effective length is calculated to be 2.5 m. Thus, the correct answer to the question is option 'D' (2.5 m).
This approach ensures that the design takes into account the reduced buckling risk due to the fixed supports, which is essential for structural stability.
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A rectangular column 300 mm × 300 mm size and 5 m long is restrained in position and direction at both ends. The recommended value of its effective length is______.a)5 mb)4 mc)2.5 md)3.25 mCorrect answer is option 'D'. Can you explain this answer?
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