Abstract
Since seismic-isolation foundations generate relatively large displacements adversely affecting the running safety of train during earthquakes, it is an important task to assess this influence and to develop a new type isolation foundation that can secure the running safety of train. In this paper the authors have proposed a seismic-isolation foundation that can convert the response displacement in the lateral direction of track to the longitudinal direction that has less effect to the running safety of train. This new type isolation foundation is composed of FPS (Friction Pendulum System) slider, concave plate and guide ditch. To confirm the behaviors of the proposed isolation foundation, model experiments were conducted under statically and dynamically loading. Moreover, 3-D numerical simulation, which can take the geometrical nonlinearity into account, was applied to explain the situation of the model experiments and real structures installed the foundation. As a result, it is verified that the proposed foundation can keep both the effects of the seismic-isolation and the running safety of train.
