Abstract
Theoretical and empirical knowledge on the dynamic response of a pile group is none the less limited. Effective tools for the dynamic analysis of a pile group should be provided immediately and the dynamic characteristics should be clarified. In this paper, the dynamic analysis method of a pile group considering the pile-soil-pile interaction effects is presented. Herein, the effects are closely included by using a point load solution derived from the thin layer formulation. Group effects on pile spacing ratios, a number of piles and soil structures are studied from the impedance functions of a pile-foundation obtained by this method. Furthermore, the reducing values on the spring constant and the damping factor of a grouped pile against those of a single pile, which are respectively defined by eqs. (26) and (27), are quantitatively evaluated from the impedance functions, and then the reducing effects on the spacing ratios and a number of piles are discussed. The resultant values would be useful for the dynamic response analysis of the structures supported by a pile group.
