Conception of performance-based pile foundation design

Based on the non-unification of superstructure-pile-soil interaction on pile foundation design in codes, the performance-based pile foundation design theory is put forward. According to the requirements of performance-based pile foundation design, design flow and calculation of the performance-based pile foundation design are discussed. Considering the superstructure-pile-soil interaction, 4 performance levels are suggested to divide respectively on earthquake, and 6 ranks of performance objectives are proposed.