Question

Which of the following is not correct?

(a) Angles and T section are strong in bending

(b) Channels can be used only for light loads

(c) I sections are most efficient and economical shapes

(d) I section with cover plates are provided when large section modulus is required

The question was asked during a job interview.

Question is taken from Beam Types and Sections in division Design of Beams of Design of Steel Structures

Answer 1

The correct answer is (a) Angles and T section are strong in bending

The best explanation: Angles and T section are weak in bending. Channels can be used only for light loads. I sections (rolled and built-up) are most efficient and economical shapes. I section with cover plates are provided when large section modulus is required. Generally, ISLB or ISMB are provided in such cases.