Abstract
In the dynamic analysis of bridges, a brigde foundation is simply modeled as sway-rocking spring model (SR-Model). It is necessary to take account of the nonlinear soil-structure interaction to determine the characteristics of spring elements. However, such elements are generally given as simple values in the usual dynamic analysis regardless of the strain amplitde of soils, foundations types, and soil conditions.
In this research, the damping factors for the SR-model are analysed through 3-D FEM model using thinlayersd element method and the comparison of the response functions between FEM model and SRmodel are made.
