Section Modulus of a Rectangular Section
Easysection modulussection properties
What is the elastic section modulus S about the strong axis for a solid rectangular section 150 mm wide × 300 mm deep?
- A2.25 × 106 mm3
- B4.5 × 106 mm3
- C1.125 × 106 mm3
- D3.375 × 108 mm3
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Answer: A. 2.25 × 106 mm3
S = I / c = (b h3 / 12) / (h / 2) = b h2 / 6 = 150 · 3002 / 6 = 150 · 90000 / 6 = 2.25 × 106 mm3. 3.375 × 108 is I (mm4), not S; 4.5 × 106 is b h2 / 3.
mm
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