Which of the following is true about torsional buckling?

Civil Engineering : Steel Structure Design - Quiz(MCQ)

it cannot occur with doubly symmetric cross section

standard hot rolled shapes are not susceptible to torsional buckling

failure occurs by bending about shear centre in longitudinal axis

failure occurs when torsional rigidity of member is greater than bending rigidity

Correct Answer : standard hot rolled shapes are not susceptible to torsional buckling

Explanation : In torsional buckling, failure occurs by twisting about shear centre in longitudinal axis. It occurs when torsional rigidity of member is appreciably smaller than bending rigidity. It can occur only with doubly symmetric cross section with very slender cross sectional elements. Standard hot rolled shapes are not susceptible to torsional buckling.

Recently Updated in Steel Structure Design Questions

Which of the following is not a parameter for decrease in strength of slender member?

residual stress

seismic load

initial lack of straightness

variation of material properties

Correct Answer : Option (B) : seismic load

Explanation : The decrease in strength of slender member is due to following parameter : imperfections- initial lack of straightness, accidental eccentricities of loading, residual stress, and variation of material properties over the cross section.