Discussion
Consider the following statements about plastic bending:
1. The plastic section modulus exceeds the elastic one.
2. The shape factor of a rectangle is about 1.5.
3. An I-section has a larger shape factor than a rectangle.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the plastic modulus exceeds the elastic one, and their ratio for a rectangle is 1.5. Statement 3 reverses the comparison - an I-section has most of its material already at the extreme fibres, so plasticity adds little and its shape factor is only about 1.15, well below the rectangle’s.
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