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Why over-reinforced sections shall be avoided while designing the sections using limit state method?

written 9.5 years ago by teamques10 ★ 70k

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reinforced concrete structures theory

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written 9.5 years ago by teamques10 ★ 70k

1. A section having percentage of tension steel greater than the critical percentage is known as over-reinforced section.
2. Since the amount of steel is more than that in balanced section, the neutral axis moves below the balanced neutral axis to satisfy the equilibrium condition resulting in the concrete reaching its ultimate strain in steel remains less than its yield value.
3. As the compressive strain in concrete reaches its ultimate value first, sudden failure of section occurs by crushing of concrete in compression, without giving any warning by way of large deformation and cracks as it does in case of an under-reinforced section.
4. Since this failure is initiated by compression in concrete, it is known as primary compression failure.
5. Hence, this type of failure is usually avoided in ultimate strength design.

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