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Q: In the design of compression members, what is the critical buckling mode that engineers aim to prevent?
  • A. Local buckling
  • B. Torsional buckling
  • C. Flexural buckling
  • D. Lateral torsional buckling
Correct Answer: Option C - Flexural buckling:- It is also called Euler buckling. • It is primary type of buckling members are subjected to bending or flexure when they become unstable. Lateral torsional buckling– As due to horizontal deflection of compression flange, the vertical load will start flange, the vertical load will start torsion in the beam. • It is prevented by lateral ties. • It can cause the beam to resist and fail under load. Local buckling– Local buckling is not a mode of failure in tension member. Local buckling is a failure mode commonly observed in thin-walled structural steel elements. • Plate element of cross section may buckle locally due to compressive stress, limit state is achieved by limiting the width to thickness ratio of each element of a cross section subjected to compression due to axial force moment and shear.
C. Flexural buckling:- It is also called Euler buckling. • It is primary type of buckling members are subjected to bending or flexure when they become unstable. Lateral torsional buckling– As due to horizontal deflection of compression flange, the vertical load will start flange, the vertical load will start torsion in the beam. • It is prevented by lateral ties. • It can cause the beam to resist and fail under load. Local buckling– Local buckling is not a mode of failure in tension member. Local buckling is a failure mode commonly observed in thin-walled structural steel elements. • Plate element of cross section may buckle locally due to compressive stress, limit state is achieved by limiting the width to thickness ratio of each element of a cross section subjected to compression due to axial force moment and shear.

Explanations:

Flexural buckling:- It is also called Euler buckling. • It is primary type of buckling members are subjected to bending or flexure when they become unstable. Lateral torsional buckling– As due to horizontal deflection of compression flange, the vertical load will start flange, the vertical load will start torsion in the beam. • It is prevented by lateral ties. • It can cause the beam to resist and fail under load. Local buckling– Local buckling is not a mode of failure in tension member. Local buckling is a failure mode commonly observed in thin-walled structural steel elements. • Plate element of cross section may buckle locally due to compressive stress, limit state is achieved by limiting the width to thickness ratio of each element of a cross section subjected to compression due to axial force moment and shear.