Collision Response of High-pier Continuous Rigid Frame Bridges with Pier Bottom Self-centering Seismic Isolation Structure Under Earthquake Action
This Taking a high-pier long span continuous rigid frame railway bridge as the research object,based on the bottom of the oval pier with self-centering seismic isolation structure test,a multiscale finite element model was established to investigate the seismic response characteristics of the high-pier continuous rigid frame isolation system,considering the collision response of the main bridge and the approach bridge.According to the results of numerical simulation analysis,the seismic response characteristics of the rigid frame piers and the interface piers in the high-pier continuous rigid frame system with and without seismic isolation at the bottom of the piers,and the seismic response characteristics of the interface piers before and after considering the collision,were studied separately.The results indicated that the adopting of isolation measures can effectively reduce the seismic response of the rigid frame piers and interface piers in the high-pier continuous rigid frame system considering the collision.Considering the collision significantly reduced the bottom shear and bending moment of the interface piers in the high-pier continuous rigid frame isolation system,but the impact on the seismic response of the rigid frame piers is not significant.Based on the model of the high-pier continuous rigid frame isolation system considering the collision,parameterized analysis was conducted on the effects of pier height,expansion joint gap,the period ratio of main bridge and approach bridge on the collision behavior,seismic response of main bridge piers,and seismic response of interface bridge piers.The reasonable values and design recommendations for each parameter were provided.
railway bridgecollision of main bridge and approach bridgenumerical simulationcontinuous rigid frame bridge with high pierseismic isolation at the bottom of pier
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