Abstract
A simplified and efficient soil structure interaction method is presented for foundation with a large number of piles. Some adjacent piles are replaced by a single equivalent pile to reduce the number of degrees of freedom. Thus, in order to correspond with the equivalent piles, the multi-point load solutions, which are the weight average of the results derived from the thin layered element method, are introduced to compute the compliance of soil. Using the method, not only impedances but also foundation input motions can be estimated. The method can also be expanded to the analysis of piled raft foundation and embedded foundation on pile group. The comparison of the results by the method with those by rigorous method is made and it is verified that the method is of sufficient accuracy and good efficiency.
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