Question

Which of the following is true?

(a) sections with greater lateral bending and torsional stiffness have great resistance to bending

(b) sections with lesser lateral bending and torsional stiffness have great resistance to bending

(c) sections with greater lateral bending and torsional stiffness have less resistance to bending

(d) lateral instability of beam cannot be reduced by selecting appropriate shapes

This question was posed to me by my school principal while I was bunking the class.

The doubt is from Lateral Torsional Buckling in section Design of Beams of Design of Steel Structures

Answer 1

Correct answer is (a) sections with greater lateral bending and torsional stiffness have great resistance to bending

To explain: Lateral instability of beam can be reduced by selecting appropriate shapes. Sections with greater lateral bending and torsional stiffness have great resistance to bending.