Civil Engineering MCQJE Level Civil Engineering
In IS 456 (LSM), the depth of rectangular stress block in the compression zone for a balanced section of Fe415 is:
RCCRCCHARD
Choose the correct answer
A
0.5 xu
B
0.42 xu
C
xu
D
0.36 xu
Correct Answer
B. 0.42 xu
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Depth of stress block = 0.42 xu (from IS 456 Annex G). The rectangular equivalent stress block has depth 0.36fck × 0.42xu (i.e., stress block extends 0.42xu from extreme fibre). The force in compression = 0.36fck × xu × b. Lever arm = d − 0.42xu.
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