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Match each instability in List I with what governs it in List II.

List I

A. Skin buckling

B. Stiffener crippling

C. Column buckling of a stiffener

D. Diagonal tension field

List II

1. Flange width-to-thickness ratio

2. Panel width, thickness and edge support

3. Post-buckled shear behaviour of a thin web

4. Slenderness ratio and end fixity

Select the correct match.

  • A.A-2, B-1, C-4, D-3
  • B.A-1, B-2, C-4, D-3
  • C.A-2, B-4, C-1, D-3
  • D.A-3, B-1, C-4, D-2

Answer: A

Correct answer: A-2, B-1, C-4, D-3

Four instabilities, each with its own governing parameter. Skin buckling depends on the panel width, thickness and the support along its edges. Stiffener crippling depends on the flange width-to-thickness ratio. Column buckling of the stiffener depends on its slenderness ratio and end fixity, through the Euler relation. And diagonal tension is the post-buckled behaviour of a thin shear web, described by Wagner’s theory.

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