ANALYSIS ON THE DUCTILITY OF PRESTRESSED HIGH STRENGTH CONCRETE PILE UNDER CYCLIC LOADING

To study the curvature ductility of a Prestressed High Strength Concrete Pile (PHC pile), the hysteretic performance of a PHC pile was analyzed with OpenSees under cyclic loading. The comparison between analytical and experimental results shows that the model is capable of accurately describing the cyclic behavior of a PHC pile. Finite element analysis was conducted to study the displacement ductility and curvature ductility of a PHC pile. The results indicated that the hysteretic loops pinched, and that the displacement ductility was bigger than 2.0. The maximum curvature of PHC piles should be controlled below 0.01 m^-1, used in engineering for a magnitude 7 earthquake, and the ultimate curvature of a PHC pile should be bigger than 0.03 m^-1, utilized in engineering for a magnitude 8 earthquake. The ultimate curvature of an existing PHC pile is bigger than 0.01 m^-1, and the curvature ductility is above 2.8. It does not satisfy the curvature ductility demand of a major earthquake, and it needs to be improved.