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A stiffener flange of width \( 25 \) mm and thickness \( 2 \) mm has a width-to-thickness ratio of

  • A.6.25
  • B.25
  • C.12.5
  • D.50

Answer: C

Correct answer: 12.5

The ratio is width over thickness:

\[ \frac{25}{2} = 12.5 \]

This is the parameter that governs local buckling of the flange, and hence the crippling stress of the section. A slender flange, with a high ratio, cripples at a low stress; a stocky one may reach yield before buckling locally, which is the practical upper limit on how efficient the section can be.

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