Seismic Performance of Continuous Rigid Frame Bridge with High Piers in High-intensity Area
Relying on railway bridges in high-intensity near-field earthquake areas,the mechanical models of bridge structures with different pier heights are established by using Midas/Civil software.Numerical simulation is carried out for two seismic conditions:frequent and rare earthquakes.The pier height is taken as the main parameter to evaluate its seismic performance in terms of natural vibration frequency of the model,displacement and internal force changes at pier top and bottom,and damper effect.The study results show that when the pier height increases,the overall vibration mode period of the bridge increases accordingly.For frequent and rare earthquakes without damping,the longitudinal and transverse bending moment changes at the pier bottom are not significant,while the axial force increases significantly.With the increase of pier height,the ratio of the bending moment at the pier top and bottom by the damper decreases greatly,resulting in better seismic mitigation effect.
railway bridgehigh-intensity areahigh piercontinuous rigid framefrequentrareseismic mitigation and isolationseismic performance
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