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.