According to IS specifications, the effective length of a column of actual length, ‘L’ effectively held in position at both the ends and restrained in direction at one end is taken as:

Question

Question

This question was previously asked in

OSSC JE (Civil) 2015 (Special Drive) Official Paper

Answer 1

Explanation:

The following table shows the effective length of prismatic compression members -

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 the column.