Comparative Study on Seismic Isolation Measures of Small Radius Curved Girder Tramway Bridge
To suit the development needs of the transportation network,small radius curved bridges are widely used,with a large proportion being tramway bridges.To ensure the seismic safety of trams in earthquake prone areas,seismic isolation devices are often used to reduce seismic response.However,there are significant differences in the effectiveness of seismic reduction and isolation between different device forms and arrangements,so it is necessary to conduct in-depth research on optimization strategies.This article takes a typical small radius curved tramway bridge as the engineering background,and based on the organic combination of multiple single damping devices,a new type of combined damping and isolation device is proposed with concept of controlling displacement by side piers and reducing internal force by middle piers.Three types of damping and isolation devices with suitable parameters,namely friction pendulum bearings(FPS),lead rubber bearings(LRB),and liquid viscous dampers(FVD),are selected.Through dynamic nonlinear time history analysis,the impact of key parameters of each device on the seismic reduction effect of curved bridges is explored and the seismic responses of the curved bridges are analyzed.Research has found that the combined seismic reduction and isolation scheme proposed in this article can significantly compensate for the shortcomings of a single seismic reduction and isolation device,achieving better seismic reduction and isolation effects,and it is worth promoting and applying the proposed scheme in similar bridges;FPS and LRB have a good control effect on the internal force at the bottom of the pier,but they will amplify the relative displacement of the pier beam to a certain extent;FVD has a better control effect on the relative displacement of the pier beam,but its control effect on the internal force at the pier bottom is worse than the other two seismic isolation devices.
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