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UPSC Civil Service Exam Questions

Q1:

Consider the following statements :
For an over-reinforced (singly reinforced) rectangular RC section.
1. the lever arm will be less than that for a balanced section.
2. the maximum stress developed by steel would equal the allowable stress in steel.
3. the maximum stress developed by concrete would equal allowable stress in concrete.
Of these statements :

A 1 and 2 are correct

B 1 and 3 are correct

C 2 and 3 are correct

D 1, 2 and 3 are correct

ANS:A - 1 and 2 are correct

Sir, the depth of the neutral axis will depend upon the area of steel.
As the section is over-reinforced therefore area of steel will be more than the area of concrete.
Therefore Xu>Xulimit (Xactual>Critical).
Wsm.
Sigmacbc = c.
T/m< (σ) st/m.



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