In this paper, we propose a simple control approach to produce negative stiffness hysteretic loops for the response control of base-isolated bridges. The combination of hysteretic loops of the controller with those of the bearing results in virtually rigid perfectly plastic force-deformation characteristics possessing large damping ratio without transmitting excessive force to other structural members. The proposed approach has the potential to be implemented as a passive approach. In this paper, the application of this approach for the response control of the benchmark structural control problem for seismically excited highway bridge has been presented.
In this paper, a new vibration control device realizing negative stiffness in a passive manner is proposed in order to reduce the absolute response of structures under strong seismic motions. The developed device consists of a sliding plate with a PTFE portion, and they are vertically pressurized by coil springs. The shape of the sliding plate is convex, by which the control force is negatively proportional to the deformation. The prototype of the proposed device was assembled, and its performance was investigated through both sinusoidal and hybrid loading tests. It was confirmed that the proposed device reduced the maximum acceleration of the structure significantly without any significant increase in absolute displacement.
Base isolation design has been adopted for a large number of bridges to prevent devastating structural damages due to severe earthquakes. In applying such a design to railway structures, however, the dynamic behavior of the track structure that significantly affects the bridge response should be investigated.In this study, the behavior of the track structure under an earthquake was clarified and modeled through shake
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