Abstract
The reversal cyclic loading tests of prestressed high strength concrete (PHC) pile were carried out, in order to investigate the effects of an axial load fluctuation on the deformation behavior of PHC-Pile. The seismic response analysis of the building foundation under a large earthquake was calculated, which was based on the experimental plastic deformation property of PHC-Pile, in which the change of deformation behavior according to the fluctuating axial loads was considered.