Abstract
The results of experimental and theoritical investigations of railway bridges have shown the significant dynamic responses exceeding that anticipated on certain railway bridges, such as a resonance phenomenon who have a great effect in the bridge. Alternatively , the use of structural control systems devices might be a very promising solution to attenuate undesirable vibration. The aim of this study, first, is to investigate the posibility of reducing the acceleration in an acceptable level by using fluid viscous dampers. The bridge-damper system is described by a single-degree-of-freedom model. The ,dampers are connected between the bottom surface of the bridge deck and the abutment, Finallay a linearisation model and a comparative study in order to investigate the effect of the nonlinearite of the device in the dynamic response of the system.
Highlights
The dynamic performance of railway bridges is an increasingly relevant issue in public transport systems due to the construction of new high-speed railway lines and the use of old lines for higher operating train velocities
Damping devices for structural control can be divided into three mains groups: passive, active and semi-active control systems, in this work the possibility of mitigating the resonant vibration of bridges by introducing passive energy dissipation devices, and in particular fluid viscous damper is investigated
A few studies dated in this area, the first documented by Museros and Martinez-Rodrigo[1,2,3] are concerned with the reducing vertical accelerations in resonant case by using double beam systems
Summary
The dynamic performance of railway bridges is an increasingly relevant issue in public transport systems due to the construction of new high-speed railway lines and the use of old lines for higher operating train velocities. Fast trains can induce resonant situation in the bridges, as the train velocity approaches the resonant velocity an inadmissible vertical accelerations may occur in the bridge. Damping devices for structural control can be divided into three mains groups: passive, active and semi-active control systems, in this work the possibility of mitigating the resonant vibration of bridges by introducing passive energy dissipation devices, and in particular fluid viscous damper is investigated. The aim of this work is to (1) propose a concept for vibration mitigation strategy for railway bridges based on the FVDs and (2) compare the effectiveness of linear and nonlinear fluid viscous dampers in the dynamic response of the retrofitted system
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