Paper Title
Behavior Of Segmental Precast Post-Tensioned Bridge Piers Under Lateral Loads

Abstract : In seismic areas, bridges are designed so that the Piers will yield rather than the superstructure. Powerful earthquakes cause residual displacement of the Pier. This permanent deformation can be difficult to repair. Un-bonded posttensioning solves the problem of residual displacement. Since strain is distributed equally throughout the tendon, it does not yield easily, and residual displacements are small. After adding pre-stressing load, tensile stresses got reduced and compressive stresses increased and increased compressive stresses are in permissible limits. In this case the effects of the pre-stressed tendon ratio and prestressing force, the longitudinal reinforcement ratio and the stirrup reinforcement ratio are studied by non-linear static pushover analyses in SAP2000, from Pushover Analysis is obtained that the yield strength & ultimate strength is improved when the pre-stressing force is applied to the Pier. From Cyclic Analysis (Hysteresis) it is obtained that hysteresis loop area will improve hence, energy dissipating capacity will be improved when pre-stressing load applied to the pier. From Fragility Curves it is obtained that the Probability of slight damage, moderate damage and heavy damage is increased for Pre-stressed Pier as compared with normal pier. Probability of complete damage is reduced for Prestressed Pier as compared with normal pier. Index Terms - Segmental Precast Post-tensioned Bridge Pier, Pushover Analysis, hysteresis loop, Fragility Curves