Seismic Design of Tied Arch Bridge in High Earthquake Region Based on Friction Pendulum Seismic Isolation Bearing

Taking the through-type tied arch bridge with a span of 144m as the research object, the working principle of the friction pendulum bearing is introduced; through the finite element simulation analysis, the seismic performance of the Yunnan Nujiang Dukou Bridge is studied, and the seismic safety evaluation is used to give. The three seismic wave time-acceleration time-history curves are respectively analyzed for the seismic performance of the through-type tied arch bridge when the friction pendulum vibration isolation support and the ordinary steel spherical hinge support are used. The research results show that the use of friction pendulum damping and isolation bearings can delay the vibration response of the superstructure from the seismic excitation, thereby achieving the effect of prolonging the vibration period of the structure and reducing the possibility of resonance of the structure under the action of an earthquake. At the same time, when the friction pendulum support swings back and forth, part of the seismic energy can be consumed by the friction between the wear plates. Compared with ordinary steel spherical hinge bearings, the use of friction pendulum vibration isolation bearings can make the piers of the arch bridge participate in the earthquake resistance together, and the internal force distribution of the piers is also more uniform. However, the horizontal displacement of the pier beams increases significantly, and corresponding protection needs to be taken.