Abstract
This paper presents an approximate evaluation method of foundation input motions (FIM) for adjacent embedded foundations on a premise that the impedance functions are known a priori. The method features distinctively in the point that the FIM can be readily evaluated only using ground motions observed in a free-field, once the impedance functions are obtained in advance. The applicability of the approximate method is examined analytically and numerically for adjacent semi-cylindrical foundations embedded in a homogeneous soil. A comparison of FIM evaluated by the approximate method with the exact result indicates a fairly good correspondence, and the availability of the presented method is confirmed.
