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Question
If a rectangular under-reinforced section is subjected to bending moment equal to its moment carrying capacity and the stress in steel and extreme compression fiber of concrete at this moment are σs and σc respectively then which of the following is correct
A.
σc = fc
B.
σs = fy
C.
σs < fy
D.
σs = fy and σc = fc
Answer ( Option B)

σs = fy

Solution

In under reinforced section, steel will yield first and therefore stress in steel will reach at yield stress of steel.
              σs = fy

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