The shape factor of a steel cross-section is defined as:
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AElastic section modulus divided by radius of gyration
BGross area divided by net area
CPlastic section modulus (Zp) divided by elastic section modulus (Ze)
DSecond moment of area divided by cross-sectional area
✓ Correct answer: C. Plastic section modulus (Zp) divided by elastic section modulus (Ze)Shape factor f = Zp/Ze. For a rectangle f = 1.5; for an I-section f ≈ 1.15. It represents reserve strength between first yield and full plastification.
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