SEISMIC PERFORMANCE OF DIFFERENT PRESTRESSED HIGH STRENGTH CONCRETE PIPE PILES

The flexural bearing capacity of prestressed concrete pipe pile was enhanced by filling，steel fiber and nonprestressed steel bar in engineering，but the mechanical property of improved prestressed concrete pipe pile under earthquake was not clear． Based on the test results of three groups of specimens under low-cyclic loading，the hysteretic energy dissipation，ductility and bearing capacity of prestressed high strength concrete pipe pile ( PHC pile) ，prestressed high strength concrete pile reinforced with steel fiber ( SFPHC pile) and prestressed high strength concrete pipe pile reinforced with nonprestressed steel bar ( PRC pile) were studied respectively and the impact on the seismic performance of such pile was studied． It was shown that the seismic performance of PHC pipe pile could be improved with configuring of nonprestressed steel bar and the bearing capacity of PHC and SFPHC pipe piles under low-cyclic loading could be improved and the energy dissipation of PRC piles could be enhanced with filled in the core from the test results． The ductility of filled pipe pile had a significant improvement compared with unfilled pipe pile．