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Civil Engineering QUESTION #6604
Question 1
In the design of a compression member (column) using AISC LRFD specifications, the flexural buckling stress $F_{cr}$ is determined based on the 'slenderness parameter' $\lambda_c$. What does a value of $\lambda_c > 1.5$ typically signify?
  • The column will fail by plastic yielding.
  • The column is 'short' and inelastic buckling occurs.
  • The column is 'long' and elastic (Euler) buckling governs.✔️
  • The column is exempt from local buckling requirements.
Correct Answer Explanation
In AISC LRFD design for compression members, $\lambda_c = (KL/r\pi) \sqrt{F_y/E}$. A value greater than 1.5 indicates the elastic buckling range where the Euler formula (modified by a resistance factor) dominates the failure mode.