Civil Engineering MCQAE Level Civil Engineering
A rectangular beam, b×d. Increasing depth d (keeping b constant) by a factor of 2, max bending stress under same BM:
Strength of MaterialsEffect of Depth on Bending StressMEDIUM
Choose the correct answer
A
Doubles
B
Reduces to half
C
Reduces to quarter
D
Remains same
Correct Answer
C. Reduces to quarter
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Z=bd²/6; doubling d quadruples Z; σ=M/Z reduces to 1/4.
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