Answer Posted / rahul

In this under reinforced section amount of stell is kept less than that in the balanced section and the N.A 'X' moves upward to satisfy the equilibrium condntht force of compression is equal to force of tension.and the failure is called tension failure bcoz yielding of steel was responsible for continued higher strains in cncrte...Now for over reinf. The amount of steel is kept more than tht in the balanced condisn..the N.A axis tends to move downward and strain in steel remains in the elastic region in case of under strain increases..in this part failure takes place due cncrte crushes and the steel is still well within elastic limit..that is compression failure takes place..

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