Pile foundations were severely damaged during the 1995 Hyogoken Nanbu Earthquakes. □It is well known that these damages were attributed to nonlinear soil-pile foundation interaction. □It has become important in designing of pile foundations to evaluate the soil resistance against piles during earthquakes or to excitations applied at the pile top. It is desired to develop a method to evaluate the soil resistance against piles based on measurement on piles. However, as measured results include inevitably some measurement errors, the errors must be removed in order to estimate properly soil resistance against piles. This paper describes an improving method to identify with accuracy the dynamic soil resistance against piles combining a smoothing procedure and a penalty matrix. The displacement and the nonlinear dynamic soil reaction are shown to be evaluated based on bending moments measured on pile nodes. The validity of the proposed method is studied through the numerical examples.
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