Abstract
To evaluate earthquake-resisting capacity of existing bridges located in Tokyo lowland, dynamic interaction among piers of bridges, pile foundations and ground should be considered. The Sway Rocking model (SR model) is a simple model to take into consideration. We have studied an analytical method to identify the elastic constants and the damping coefficients using the observed earthquake motions at the top of pier and on the surface of ground. In this paper, the validity of identification analysis method according to SR model is verified using dynamic centrifugal model test from relationship between natural period of ground and pier, and the setting method of the elastic constants and the damping coefficients is proposed. Whether the dynamic analysis according to SR model using the elastic constants and the damping coefficients set by the method is applicable in level 2 earthquake motion is examined. As the result, it is proven that the simplified dynamic response analysis according to SR model reproduced the response of pier in two-dimensional FEM analysis approximately.
