Discussion
The shape factor of a rectangular section, being the ratio of plastic to elastic section modulus, is
Answer: C
The elastic modulus is \( bh^2/6 \) and the plastic modulus is \( bh^2/4 \), so the ratio is \( 6/4 = 1.5 \). An I-section, with its material already concentrated in the flanges, gives a shape factor much closer to one, typically around 1.15.
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