抄録
In this paper a simplified method, in which a group of piles is viewed as a single equivalent upright beam, is presented for expression of the dynamic stiffnesses of grouped piles subjected to lateral force and bending moment. An effective computer program with very little memory, based on the Thin Layered Element Method, is used for this purpose. The results of the program are compared with those calculated by the 3-dimensional Finite Element Method for several cases of large-scaled grouped piles. The results obtained lead to the conclusion that the simplified method that is presented is sufficiently accurate for the purpose of preliminary evaluation of the pile cap stiffnesses for sway and rocking motions of large-scaled grouped piles.
