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Q: Why is the design of a R.C. section as over-reinforced undesirable?
  • A. It consumes more concrete
  • B. It undergoes high strains
  • C. It fails suddenly
  • D. Its appearance is not good
Correct Answer: Option C - When the section is over reinforced concrete achieves its maximum permissible strength prior to steel at the time of failure. • In over-reinforced section NA depth is large hence strain across the section remains low. Consequently the curvature, deflection and crack width also remains low. • Thus failure is sudden. • This kind of section is always avoided because it indicates or provides brittle failure.
C. When the section is over reinforced concrete achieves its maximum permissible strength prior to steel at the time of failure. • In over-reinforced section NA depth is large hence strain across the section remains low. Consequently the curvature, deflection and crack width also remains low. • Thus failure is sudden. • This kind of section is always avoided because it indicates or provides brittle failure.

Explanations:

When the section is over reinforced concrete achieves its maximum permissible strength prior to steel at the time of failure. • In over-reinforced section NA depth is large hence strain across the section remains low. Consequently the curvature, deflection and crack width also remains low. • Thus failure is sudden. • This kind of section is always avoided because it indicates or provides brittle failure.