Plumb measuring, television observation, and pile inclinometer survey are conducted for PHC piles (Prestressed High strength Concrete piles) supporting a two-story building that experienced severe tilt due to soil liquefaction of reclaimed fill on Port Island in the 1995 Hyogoken-Nambu earthquake. A pseudo-static analysis is conducted in which the ground displacement profile estimated by one-dimensional effective stress analysis is applied to the pile through p-y springs. It is shown that: (1) the piles suffer extensive damage, with a horizontal displacement of about 0.4 m at the pile head and with horizontal gaps at about 3 m below the pile cap, (2) the horizontal gaps of the piles occurred in the plane parallel to the major direction of the earthquake ground motion, while the residual lateral deformation of the piles within the liquefied reclaimed fill occurred in a different direction, (3) most of the cracks in the piles occurred in the liquefied reclaimed fill, and (4) the analytical results showed a good agreement with those obtained by field investigations.
