Research On Seismic Isolation Design Of Long Span And Super Long Unit Continuous Beam Bridge In High Seismic Intensity Area

Due to the inertial force of long span and super long unit continuous beam bridge is rather Large,the traditional ductility seismic design method cannot meet the needs of seismic performance of bridge seismic design.In this themes,the main bridge of Chaoan Hanjiang Bridge is taken as an engineering example,and its research on the reduction and isolation design is carried out.The research work is as follows:Firstly,based on the review of the seismic design and calculation method of the bridge,the principle and application of the anti-seismic isolation of the liquid viscous damper,the hyperboloid spherical isolation bearing and the cable damping bearing are expoundedSecondly,taking the main bridge of Chaoan Hanjiang Bridge as an example,The dynamic analysis model of the bridge was established by the finite element program ANSYS.The simulation of the model focuses on the simulation of the stiffness,mass and boundary conditions of the structure,making it as consistent with the actual structure as possible.Thirdly,according to the characteristics of the main bridge of Chaoan Hanjiang Bridge,the scheme of reducing the isolation of the general continuous girder bridge are determined.By comparation of the reduction effection of them through the method of nonlinear time history analysis,The effect of the isolation system is analyzed.Fourthly,the influence of the main parameters of viscous dampers,hyperboloid spherical isolation bearings and cable supports on the vibration reduction effect of bridges is analyzed,Which can provide a reference for the design of the isolation and isolation of the long span continuous girder bridge.Fifthly,the bearing calculation model is established which can consider the horizontal friction of the bearing and the coupling of the vertical dynamic reaction and bearing plane motion.And the effects of vertical ground motion on the vertical dynamic response and hysteresis characteristics of the friction-type isolation device and the seismic response of the bridge are analyzed.