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Consider the following for local capacity of section: 1. Local section failure is usually encountered in the case of short stocky beam-columns with relatively smaller axial compression ratio and beam-columns bent in reverse curvature. 2. The strength of end section reached under combined axial force and bending, governs the failure. 3. The strength of the section may be governed by plastic buckling of plate elements in the case of plastic, compact and semi-compact sections. Which of the above statements are correct?

Consider the following for local capacity of section: 1. Local section failure is usually encountered in the case of short stocky beam-columns with relatively smaller axial compression ratio and beam-columns bent in reverse curvature. 2. The strength of end section reached under combined axial force and bending, governs the failure. 3. The strength of the section may be governed by plastic buckling of plate elements in the case of plastic, compact and semi-compact sections. Which of the above statements are correct? Correct Answer 1, 2 and 3

Explanation:

Beam-columns are members subjected to combined bending and axial compression.

The following are the possible modes of failure of beam columns:

Local Section Failure:

  • This is usually encountered in the case of short, stocky beam-columns (λ/r << 50) with a relatively smaller axial compression ratio (P/Pd < 0.33) and beam-columns bent in reverse curvature.
  • The strength of the end section reached under combined axial force and bending moment governs the failure.
  • The strength of the section may be governed by plastic buckling of plate elements in the case of plastic, compact and semi-compact sections or the elastic buckling of plate elements in the case of slender sections

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