Civil Engineering MCQJE Level Civil Engineering
The limiting value of neutral axis depth ratio (xu,lim/d) for Fe415 steel as per IS 456 (LSM) is:
RCCRCCMEDIUM
Choose the correct answer
A
0.53
B
0.479
C
0.46
D
0.40
Correct Answer
B. 0.479
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xu,lim/d = 0.479 for Fe415. This comes from the strain compatibility at balanced section: concrete crushing strain εcu = 0.0035 and steel yield strain = 0.87fy/Es + 0.002. For Fe415: xu,lim/d = 0.0035/(0.0035 + 0.87×415/200000 + 0.002) ≈ 0.479. Singly reinforced beams must have xu < xu,lim.
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