Civil Engineering MCQAE Level Civil Engineering
Rectangular beam 100 mm wide × 200 mm deep, max BM = 20 kN·m. Max bending stress:
Strength of MaterialsBending Stress RectangleMEDIUM
Choose the correct answer
A
15 N/mm²
B
20 N/mm²
C
30 N/mm²
D
60 N/mm²
Correct Answer
C. 30 N/mm²
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Z=bd²/6=100×200²/6=666,667 mm³; σ=M/Z=20×10⁶/666,667=30 N/mm²
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