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A column is held in position and restrained against rotation at one end while not restrained against rotation at other end but held in position. The effective length of such a column as per IS 456 : 2000 is
  • a)
    0.65 L
  • b)
    1.2 L
  • c)
    0.80 L
  • d)
    0.75 L
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A column is held in position and restrained against rotation at one en...

Theoretical value = 0.70 L
Recommended value = 0.80 L
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Most Upvoted Answer
A column is held in position and restrained against rotation at one en...
Effective Length of a Column Restrained Against Rotation at One End

The effective length of a column is an important parameter in the design of columns as it affects the buckling load of the column. When a column is restrained against rotation at one end and not restrained at the other end, the effective length is determined as per IS 456:2000.

Formula for Effective Length

The formula for effective length of a column restrained against rotation at one end is given by:

Le = 0.8 L

Where,
Le = Effective length of the column
L = Length of the column

Explanation

When a column is restrained against rotation at one end, it means that the column is fixed at that end. This creates a moment restraint at that end which reduces the effective length of the column. However, at the other end, the column is free to rotate, which means that there is no moment restraint at that end. This increases the effective length of the column.

As per IS 456:2000, the effective length of such a column is taken as 0.8 times the actual length of the column. This is because the column is partially restrained against rotation at one end, which reduces the effective length to an extent.

Conclusion

Thus, the correct option for the effective length of a column restrained against rotation at one end is option C, i.e., 0.8L.
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A column is held in position and restrained against rotation at one end while not restrained against rotation at other end but held in position. The effective length of such a column as per IS 456 : 2000 isa)0.65 Lb)1.2 Lc)0.80 Ld)0.75 LCorrect answer is option 'C'. Can you explain this answer?
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