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Q: Which of the following sections is ideally suited for a compression member?
  • A. Section with different moment of inertia about perpendicular axis passing through its centre of gravity.
  • B. Section with same moment of inertia about perpendicular axis passing through its centre of gravity.
  • C. Section with high amount of material unevenly distributed.
  • D. Section with larger length.
Correct Answer: Option B - Compression member–Ideal section for compression member, one having same moment of inertia about any axis through its center of gravity. • Compression member must be sufficiently rigid to prevent general buckling in any possible direction and each element of member must be thick enough to prevent local buckling. • Tubular section is the best compression member section because of high local buckling strength, more torsional resistance and subjected to less wind force than any section.
B. Compression member–Ideal section for compression member, one having same moment of inertia about any axis through its center of gravity. • Compression member must be sufficiently rigid to prevent general buckling in any possible direction and each element of member must be thick enough to prevent local buckling. • Tubular section is the best compression member section because of high local buckling strength, more torsional resistance and subjected to less wind force than any section.

Explanations:

Compression member–Ideal section for compression member, one having same moment of inertia about any axis through its center of gravity. • Compression member must be sufficiently rigid to prevent general buckling in any possible direction and each element of member must be thick enough to prevent local buckling. • Tubular section is the best compression member section because of high local buckling strength, more torsional resistance and subjected to less wind force than any section.