Civil Engineering MCQAE Level Civil Engineering
A simply supported beam 5 m span, rectangular 150 mm×300 mm. If max bending stress ≤ 10 N/mm², the max UDL is approximately:
Strength of MaterialsMax UDL from Allowable StressMEDIUM
Choose the correct answer
A
7.2 kN/m
B
12.0 kN/m
C
18.0 kN/m
D
24.0 kN/m
Correct Answer
A. 7.2 kN/m
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Z=150×300²/6=2,250,000 mm³; M_allow=10×2,250,000=22.5×10⁶; w=8M/L²=8×22.5×10⁶/25×10⁶=7.2 kN/m
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