Discussion
Consider the following statements about effective width:
1. It is the strip of skin near a stiffener still carrying stress after buckling.
2. It varies inversely with the square root of the stiffener stress.
3. It increases as the structure approaches its ultimate load.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: effective width is the strip still working after buckling, and it varies as the inverse square root of the stiffener stress. Statement 3 reverses that relation - as the stress rises towards ultimate, the effective width narrows, which is precisely why the structure grows less efficient the harder it is worked.
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