Civil Engineering MCQAE Level Civil Engineering
Simply supported beam 6 m span, UDL 8 kN/m, allowable bending stress 120 N/mm². Minimum required section modulus:
Strength of MaterialsRequired Section ModulusMEDIUM
Choose the correct answer
A
150,000 mm³
B
250,000 mm³
C
300,000 mm³
D
450,000 mm³
Correct Answer
C. 300,000 mm³
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M=wL²/8=8×36/8=36 kN·m=36×10⁶ N·mm; Z=M/σ=36×10⁶/120=300,000 mm³
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