Discussion
Consider the following statements about crippling:
1. It is local buckling of the stiffener flanges.
2. It occurs at a stress that may be below the material's yield.
3. It depends on the flange width-to-thickness ratio.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1, 2 and 3
All three are correct and together they define crippling. It is local buckling of the flanges and webs of a stiffener rather than of the member as a whole; it can and usually does occur below the material’s yield stress, which is why crippling rather than yield is the compressive allowable; and it is governed by the width-to-thickness ratio of each element, which is what the empirical crippling curves are plotted against.
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