Continuous Rigid Frame Bridge Seismic Isolation Technology,

The traditional method of the aseismic bridge design is to ensure the structure to have enough intensity and ductility to resist earthquake. Since the earthquake resistance of bridge structure and seismic effect are very difficult to be estimated accurately, there are many bridges that have been damaged or collapsed in the earthquake. However, in the aseismic design of engineering structures, a new method named seismic isolation has been found to solve this problem, with which the isolators and dampers are used to isolate, absorb and disperse energy so that seismic response of structures is reduced.In this thesis, the main bridge of Huanghe Highway Bridge in sanmenxia is taken as the engineering background, and the application of seismic isolation technology in the continuous rigid frame bridges is discussed. Firstly, the analytical methods on seismic response of the long-span highway bridges are expounded, while influence of interaction of soil-pile-structure and traveling wave effect on the structures are considered. Some stiffness matrices of special elements such as rubber bearings and components with field are derived from primary-secondary and inverse transform in Structural Matrix Analysis. Then, seismic response analytical models and non-isolated continuous rigid frame bridges are set up, while considering the interaction of soil-pile-structure and traveling wave effect simultaneously. Finally, the seismic time history response of the two models is calculated by means of the finite element method, and the results show that the isolated bridge posses powerful earthquake resistance. Hence, the seismic isolation technology can be applied in the aseismic design of engineering structures as a good way.