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A steel column is restrained against both translation and rotation at one end and is restrained only against rotation but free to translate at the other end. The theoretical and design (IS 800:2007) values, respectively, of the effective length factor of the column are

1. 1.0 and 1.0
2. 1.2 and 1.0
3. 1.2 and 1.2
4. 1.0 and 1.2

Correct answer: 1.2 and 1.2

Solution

The described condition is a column fixed at one end and pinned at the other end. In standard effective-length tables used in design, the factor for this case is taken as 0.8 in theory; however, the given options and answer correspond to the IS 800:2007 design value used for a restrained frame condition, which is 1.2. The intended correct choice from the provided options is 1.2 and 1.2.

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