Civil Engineering - Steel Structure Design - Discussion

As both ends are pin jointed and free to rotation.

Its answer. Should be 1.5 as one end is fix in rotation and translation movement while other end is rigid with roller support.

Answer is E. Fixed at bottom and free at other end it is cantilever. So answer is 2.0 L.

The correct answer is E. It says and I quote "not held in position" so is free to sway. Hence it's 2L.

The correct answer is 1.2 as one end is fixed and the other end free to move in horizontal direction.

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

Effective length = 0.80 L.

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

Effective length = 1.2 L.

The question is incorrect or incomplete because it has not mention whether to tell - theoretical or recommended value of effective length. As per theoretical value of effective length the answer will be "l". But. As per recommended value of effective length the answer will be "1.2l".

On other hand this question can be considered a tricky one, since the optional value "0.67l" and "0.85l" doesn't exist in place it is "0.65l" and "0.8l". Moreover "1.5l" couldn't b the answer since there is no where mention the partially restrained against rotation condition.

So this is also incorrect. "2l" can also not b the correct one because your its only applicable for 2 conditions for which you can refer your book or notes.

Thank you!

In any steel structure book recommended vale is given but theoretical is not mentioned. So by default we will understand that recommended value is asked. Recommended value is 1.2L.

In IS 456:2000, Table no. 28, the theoretical value of effective length for above mentioned condition is 1.00L. Therefore answer is correct.