Civil Engineering MCQAE Level Civil Engineering
In Working Stress Method, the modular ratio m for M20 concrete is (using IS 456 old approach):
RCCModular RatioMEDIUM
Choose the correct answer
A
280/(3σ_cbc)
B
500/f_y
C
E_s/E_c
D
All of the above depending on context
Correct Answer
A. 280/(3σ_cbc)
Why is this the answer?
m = 280/(3 × σ_cbc) as per IS 456 (Working Stress Design). For M20 concrete, σ_cbc = 7 N/mm², so m = 280/(3×7) = 13.3. Note: This is a simplified formula not E_s/E_c.
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