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Abstract. The fibrous beam element and common node method in ABAQUS software were used to set up a finite element model of PHC pipe piles , and the seismic performance of the PHC pipe piles were studied. UCONCRETE01 constitutive model and USTEEL02 constitutive model were respectively used for the concrete and the prestressed longitudinal reinforcement in the element model of the PHC pipe piles. The soil-pile interaction was simulated by the p-y soil-spring model under cyclic loading. The influence of reinforcement ratio, buried depth, axial compression ratio, shear strength of undrained soil on the cumulative dissipating hysteretic energy and displacement ductility coefficient of the PHC pipe piles were discussed. The results show that the cumulative dissipating hysteretic energy of pile increases with the reinforcement ratio and buried depth increasing, and decreases with the axial compression ratio of pile top increasing. Meanwhile, the displacement ductility coefficient also increases with the buried depth of PHC pile increasing, but does not show significant influence by the reinforcement ratio and shear strength of undrained soil. The results can provide some reference for the seismic design of PHC pipe piles.

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Abstract.To study the influence of pile-soil interaction on the seismic behavior of PHC piles, this paper takes the PHC pile in the soft clay as the research object, which is simulated by fiber beam element, and the pile-soil interaction is simulated by using equivalent embedded method and p-y soft clay soil spring which is under cyclic load, respectively. The seismic behavior index of pile foundation under limit state is obtained through applying the horizontal cyclic load on the pile top. The research shows that, with the different depth of pile, the hysteretic energy dissipation index and the displacement ductility factor obtained by the equivalent embedded model are about 2.2~2.5 times and 1.1~1.4 times of the p-y curve model respectively. While the yield strength and ultimate strength obtained by the p-y curve model are larger than those obtained by equivalent embedded method.