Author(s)

D. Badoni & N. Makris

Abstract

In this paper, the problem of computing nonlinear dynamic response of a structure resting on piles is investigated. The superstructure is modeled by a simple two degree-of- freedom system. The Bouc-Wen model is used to model nonlinear behavior of the superstructure. A time-domain formu- lation is presented in which the restoring force from the foundation is given by means of a convolu- tion integral that uses the velocity history of the foundation relative motion and the dynamic relaxation stiffness of the foundation. This relaxation stiffness is calculated by numerically trans- forming available dynamic impedances into the time domain. The method is first validated at the linear limit by comparing time with frequency domain analyses. Subsequently, it is used to comp

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