Civil Engineering MCQJE Level Civil Engineering
The section modulus Z of a rectangular section of width b and depth d is:
Strength of MaterialsStrength of MaterialsEASY
Choose the correct answer
A
bd³/6
B
bd²/6
C
b²d/6
D
bd/6
Correct Answer
B. bd²/6
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For rectangle: I = bd³/12, ymax = d/2. Section modulus Z = I/ymax = (bd³/12)/(d/2) = bd²/6. Z represents the resistance to bending; higher Z means lower stress for same moment. Z = M/σmax from the flexure formula.
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