EXPERIMENTAL STUDIES OF FLEXURAL BEHAVIOR OF NEW TYPE PRESTRESSED CONCRETE PIPE PILE WITH COMPOUND UNPRESTRESSED REINFORCEMENT

It was presented the concept of a new type unprestressed reinforcement compounded prestressed concretepipe pile ( URC-PCPP )．In the URC-PCPP, in order to increase the bending capacity and ductility, someunprestressed HRB400 rebars were added, forming horizontal loading concrete compound sections．Five kinds of fullscale URC-PCPPs and two kinds of full scale common prestressed concrete pipe piles that used for comparison weredesigned and fabricated．The standard bending tests on the specimens were carried out．The test results showed thatthe URC-PCPPs possed good flexure properties．Based on the data from the tests and GB 5001 0 201 0 ConcreteStructure Design Code, the formulas for the crack moment was suggested and the design equations of flexural capacityfor the URC-PCPPs as well as the formulas of ultimate moment for the factory checkout of the pipe piles were derived．The numerical results agreed well with the test data, satisfying to the design requirement of the pipe pile．