Two-fold Statically Indeterminate Interaction between Two Unstressed or Prestressed Bonded Tendons and Concrete
In many cases, particularly when the live-load component is large, top as well as bottom reinforcement must be used to take up varying moments. Then, Eqs. (2.10) and (4.3) are no longer valid. However, they can be used as approximations for the prestress loss in the main tendon when the force in the adjoining tendon is small.
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