Question

Which of the following is not true?

(a) only plastic section can be used in intermediate frames

(b) slender sections are preferred in hot rolled structural steelwork

(c) compact sections can be used in simply supported beams

(d) semi-compact sections can be used for elastic designs

This question was addressed to me in unit test.

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

Answer 1

The correct answer is (b) slender sections are preferred in hot rolled structural steelwork

The best I can explain: Only plastic section can be used in intermediate frames which form collapse mechanism. Compact sections can be used in simply supported beams which fail after reaching Mp at one section. Semi-compact sections can be used for elastic designs where section fails after reaching My at extreme fibres. Slender sections are not preferred in hot rolled structural steelwork, but they are extensively used in cold formed members.