For a prestressed concrete continuous beam subject to different load combinations, which one of the following is correct for concordant cable profile?

It is not unique, but located in a narrow zone

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It is unique

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It is selected as compromise between secondary stresses and working stresses

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It is selected based on deflection profile

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Solution

The correct option is A It is not unique, but located in a narrow zone
The tendon profile which does not induce secondary moments at support is referred to as concordant profile. It depends upon degree of indeterminacy of structures and is not unique for all type of loading and support conditions. Thus profile satisfies a set of geometrical conditions and located in narrow zone.

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