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The effective length of a compression member of length L, held in position and restrained in direction at both ends is
1. L
2. 0.67 L
3. 0.85 L
4. 1.5 L

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Correct Answer - Option 2 : 0.67 L

Effective length for compression members under different end conditions is given as:

 Degree of end restraint

Theoretical value

Recommended value

Effectively held in position and restrained against rotation at both ends.

0.50L

0.65L

Effectively held in position and restrained against rotation at one end

0.70L

0.80L

Effectively held in position at both ends, but not restrained against rotation.

 1.00L

 1.00L

Effectively held in position and restrained against rotation at one end and at other end restrained against rotation but not held in position

1.00L

1.20L

Effectively held in position and restrained against rotation at one end and at other end partially restrained against rotation but not held in position

-

1.50L

Effectively held in position at one end but not restrained against rotation and at other end restrained against rotation but not held in position.

2.00L

2.00L

Effectively held in position and restrained against rotation at one end and at other end not held in position and not restraint against rotation.

2.00 L

2.00L


Where L is the unsupported length of column.

For battened struts, the effective length should be increased by 10%.

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