Question

For a prestressed concrete continuous beam, it is true that the concordant cable profile

• A. is not unique in any given statistically indeterminate beam but it is located within a certain narrow zone
• B. may be selected so that it causes no secondary stresses ignoring economy
• C. may be chosen as a compromise between the secondary stresses and the working stress based on economy
• D. should be chosen consistent with all the statements made in (a), (b) and (c)

Answer 1

The correct option is B may be selected so that it causes no secondary stresses ignoring economy

Secondary moments are developed due to redundant reactions at indeterminate supports when statistically indeterminate structures are prestressed. The tendon profile which does not induce secondary moments at support is referred to as concordant profile.