EFFECT OF SURFACE LAYER FREEZE TO SOIL-PILE INTERACTION

Abstract

 In order to assess earthquake resistance of new or existing structures and predict earthquake damage of structures, it is important to properly evaluate the response of the structure at the time of the earthquake. In cold regions where the ground may freeze in winter, the possibility of a change in the dynamic interaction phenomenon can not be denied because it is affected by the density of the ground and the shear wave velocity. Therefore, we examined the influence of freezing of ground on the behavior of the structure by examining the interaction between the frozen ground and the pile.
 As a result, it was shown that group piles in the frozen ground tend to follow the behavior of the ground in a wide band. Furthermore, it was shown that even when the ratio of the freezing depth to the characteristic length indicated by the rigidity ratio of the ground and the group pile is small, the rigidity at the time of freezing becomes very large. It was confirmed that the freezing of the ground greatly affected the interaction between the ground and the pile.