Vibration control of high-speed railway bridges using non linear viscoelastic dampers

Abstract eng:
In the present study the energy-absorbing capacities of viscoelastic dampers (VEDs) applied to the retrofit of high-speed railway bridges are investigated. The behavior of the damping material is simulated using a non-linear fractional derivative model, previously developed by Tsai and Lee, and in good agreement with experimental tests. As for the railway bridge, it is modelled as a simply supported beam with Euler-Bernoulli behaviour. A set of discrete VEDs connect the bridge deck with an auxiliary Euler-Bernoulli beam, which transforms the deck vertical oscillations into dampers relative movement. As an example, a simply supported railway bridge with inadmissible vertical accelerations is retrofitted with viscoelastic dampers. Numerical results show that the dynamic response of the structure with added VEDs is significantly reduced in resonance, compared to the response of the system without dampers.

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