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Which of failure is considered in the design of prestressed concrete members for the limit states of collapse?

Which of failure is considered in the design of prestressed concrete members for the limit states of collapse? Correct Answer Ultimate failure

The distribution of compressive stress in the section at the ultimate failure stage is considered and the effective depth required is estimated by equating the total ultimate moment with the internal resisting angle.

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Now which of the following is correct
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The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (where xu is the depth of neutral axis at the limit state of collapse)