Research On Seismic Behavior Of Nonlinear Damping And Radiation-reducing Isolation Bearings In Weihe Bridge

Bridge infrastructure is becoming more and more important with the continuous development and progress of China’s transportation industry.However,when the bridge is affected by the earthquake,its structure will be damaged to varying degrees,which will directly affect people’s personal and property safety.For high intensity area,there are large vertical load and high pier type bridges,it is very important to choose the seismic isolation device with good shock absorption effect.Generally speaking,the two basic principles of the development of seismic isolation technology are to extend the natural vibration period of the structure and increase the damping of the structure to reduce the impact of earthquake on the structure.This article through the analysis of nonlinear damping radial structure and isolation bearing vibration isolation principle,carries on the comparison to damping calculation method,relying on the weihe bridge under construction in national highway 310(combination of 47 + 80 + 47 m span of variable cross-section continuous box girder),using MADIS/CIVIL2015 with nonlinear damping wheel set isolation bearing and JQZ aseismic pedestal bridge structure dynamic analysis model,using time history analysis method,the earthquake under the action of two kinds of E1 and E2,research to the bridge structure in the bridge and the transverse bridge to the internal force and displacement and acceleration dynamic response value,The response values of the two types of supports are compared and analyzed one by one.This paper studies the influence of nonlinear damping and radiation-isolation bearing structure on the seismic isolation effect under the influence of different pier heights,different spans and different damping ratios of supports.Finally,it is concluded that the nonlinear damping and radial isolation bearing of the bridge under construction is smaller than that of conventional aseismic bearing in both the direction of the bridge and the direction of the transverse bridge.The higher the pier is,the smaller the response value of nonlinear damping and isolation bearing bridge’s internal force is.The larger the span,the less the shock absorption effect of the bridge with the support.The larger the damping of bearing,the more obvious the effect of bearing isolation,and the best effect of damping is in the range of 0.05 ~ 0.15.The whole bridge is earthquake-resistant in a coordinated way,and the stress of each pier is more uniform.Therefore,it is always a research direction to reduce the internal force response of fixed pier.This article is based on the analysis of the principle of speed lock feature,in MADIS/CIVIL2015,use of viscous dampers(MAXWELL model)to the principle of the simulation speed lock,attach speed lock in the bridge dynamic model with nonlinear damping amplitude decrease isolation bearing bridge internal force response comparison,analysis of the characteristics of seismic performance,to compensate for the nonlinear damping amplitude decrease isolation bearing in the engineering application of short board,make its seismic effect is best.Through the above analysis and research,it provides certain guiding significance for the selection of seismic bearing of Bridges with high intensity,high pier and large vertical load.