Question

Which of the following statement is true?

(a) unequal angles are desirable over equal angles

(b) least radius of gyration of equal angle is less than that of unequal angle for same area of steel

(c) single angle sections are suitable for long lengths

(d) least radius of gyration of single angle section is small compared to channel and I-sections

The question was asked during an internship interview.

My question is based upon Behaviour of Compression Members & Types of Sections in section Design of Compression Members of Design of Steel Structures

Answer 1

The correct choice is (d) least radius of gyration of single angle section is small compared to channel and I-sections

The best explanation: Equal angle are desirable and economical over unequal angles because least radius of gyration of equal angle is greater than that of unequal angle for same area of steel. Single angle sections are not suitable for long lengths. Least radius of gyration of single angle section is small compared to channel and I-sections.