Abstract
Pile foundations near the shoreline in Kobe city were severely damaged due to liquefaction-induced lateral spreading during the Hyogo-ken Nambu Earthquake, January 17,1995. Kuwabara and Yoneda (1998) presented an excelent case history of damage to a cast-in-place concrete pile foundation of a building that was under construction during the earthquake, but with little consideration of the effects of lateral speading on the damage. The objective of this study is to investigate the effects of lateral spreading on the damage based on effective stress response analysis of a soil-pile foundation system. The observed strong motion in a borehole array at Higashi-Kobe Bridge is employed as an input motion to the soil-pile foundation system. It is found that soil response near the shoreline are greatly affected by liquefaction-induced lateral spreading and that the damaged mechanism of pile foundations varies greatly with distance from the shoreline.
