Isolation Analysis Of Double Column Bridge With High Pier And Reduction

The double column pier has the advantages of convenient construction,the stress characteristics of clear advantages,is often used in bridge pier form design.In this paper an actual highway bridge as an example,the transverse lines on the pier beam was optimized,and analyzed the effect of damping of four different bearings are compared and analyzed.This paper established the elevated bridge Shi Ping full bridge model using Etabs and Midas software,the bridge self vibration period and vibration type were compared by Etabs software to analyze the vibration response of the influence of transverse beam number on the bridge.And then use the Pushover function in Midas software for single pier model the displacement calculation.Analysis of the number of the transverse beam,positions and stiffness of each pier under seismic load internal force and displacement of the main section of this paper.The Etabs software was used to establish different transverse beam number,full bridge models with different transverse beam position and different transverse beam stiffness were compared,and the Taft wave,El-Centro wave and Tianjin wave three to the earthquake input,in response to the earthquake are compared,in order to select the most reasonable set of transverse beam.Study on the influence of damping coefficient and damping index of viscous damper parameters on the damping effect;comparative analysis of the viscous damper,damping effect of reducing friction pendulum bearings and high damping rubber bearing and lead rubber bearing of double column bridge with high pier.The calculation results show that the number of internal force distribution and the cross department of high pier bridge with double column bottom structure under earthquake beam has a very close relationship,and through the design of reasonable transverse horizontal tie beam to increase the stiffness of the bridge,and the internal force of the lower part of the structure of reasonable allocation,improve the seismic performance of bridges in 0.4,0.5,0.7times of the pier.At the height of the layout of a road and pier stiffness ratio of cross line0.5-0.75 between the beams,can reduce seismic damage of high pier bridges.Four seismic isolation device,wherein the viscous dampers continuous beam damping effect is best,is suitable for the main beam to design of bridge to shock absorption.Set the friction pendulumbearings will substantially increase the beam of double column bridge with high pier and torque,so the friction pendulum bearings for bridges on torsional performance.The overall effect of isolation set high damping rubber bearing and lead rubber bearing double column bridge with high pier is lower than that of viscous dampers for longitudinal stiffness the high degree of the bridge.