Final answer:
The recommended value of effective length (le) for a compression member having effectively held in position at both ends, restrained against rotation at one end, according to IS 456:2000, is 0.7 times the actual length (L) of the member.
Step-by-step explanation:
The recommended value of effective length (le) for a compression member that is effectively held in position at both ends and restrained against rotation at one end, according to IS 456:2000, is given by the formula: le = 0.7L, where L is the actual length of the member.