Comparative study on structural behaviour of bonded and unbonded post-tensioned beam

In this study, a simple computer program are written using FOTRAN 90 to investigate the behavior of simply supported beam constructed with straight tendon which are subjected to three different load cases. Considering the same stresses applied, beam subjected to loading at one third span shows a less deflection than other load cases. Behavior due to the deflection of bonded tendon gave good performance than unbonded tendon. However, beams with larger span-to-depth ratio would require deviators in case of external prestressing beam to achieve the desired performance. Parabolic and trapezoidal tendon allows the prestressed beam to carry heavier loads because of the balancing effects of the vertical component of the prestressing nonstraight tendon. Hence it will reduce the required prestressing force at the mid span than the force required in the straight tendon.

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