Civil Engineering MCQJE Level Civil Engineering
A 200 mm × 300 mm rectangular section carries both axial load P = 360 kN and bending moment M = 18 kN·m. The maximum compressive stress is:
Strength of MaterialsStrength of MaterialsMEDIUM
Choose the correct answer
A
6 MPa
B
12 MPa
C
18 MPa
D
3 MPa
Correct Answer
B. 12 MPa
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σ = P/A ± M/Z. A = 200×300 = 60,000 mm². P/A = 360,000/60,000 = 6 MPa. Z = 200×300²/6 = 3,000,000 mm³. M/Z = 18×10⁶/3×10⁶ = 6 MPa. Maximum compression = 6+6 = 12 MPa; minimum = 6−6 = 0 MPa. Eccentric loading: stress at extreme fibres = direct stress ± bending stress.
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