Abstract
In the 1995 Hyogoken-nambu earthquake and so on, many structures with pile foundation have received damage at upper part or soil layers boundary part of piles and at building columns or bridge piers of he superstructure. In this places, relationship between ground and earthquake-damaged parts of structures with pile foundation has been investigated in both the case study and the seismic response analysis. It has been found out that many damage of columns or piers had occurred at the gravelly and/or sandy ground with comparatively thin and soft soil layer, pile damage has occurred in the soil layers boundary part within its ground, and particularly upper part damage of piles has occurred in the reclamed land on soft soil ground with void under the footing. It has been found out by seismic response analysis that their damage has been occurred at stress concentration part of structures.
