Seismic Analysis Of High-speed Railway Bridge And Vibration Isolation

In recent years,the rapid development of the economy to promote the reform of railway and the means of transport technology innovation,high-speed railway arises at the historic moment.Bridge as an important part of lifeline engineering,once damaged in the earthquake will cause serious consequences.And our country is located in earthquake-prone areas,Bridges frequent earthquake damage brought us a profound lesson.And the earthquake and reduce isolation study of high-speed railway is relatively small,especially the high damping rubber bearing in high speed railway of isolation are much rarer.This paper to analyze seismic performance of high-speed railway bridge pier,creatively analyzes the high damping rubber isolation bearing in high speed railway bridge to reduce isolation applications;In changzhutan intercity simply supported girder bridge as the engineering background,through the use of the finite element software Midas civil and bridge single pier model and simply supported beam model is established,based on the single pier model for bending moment-curvature analysis and static elastoplastic analysis,the beam model of dynamic time history analysis the following conclusions:(1)Through the analysis of cross section,longitudinal reinforcement strength,concrete strength and axial compression ratio on the bending moment-concluded that the influence of curvature on round,square,rectangular and circular shape cross section,the rounded shape cross section has good seismic performance,and the seismic performance of rectangular the weakest.(2)To 5 m,9 m,13 m,17 m,20 m five high pier bridge,the static elastoplastic analysis capacity spectrum and demand there is intersection pier to meet seismic requirements,but the node from the pier and elastic range gradually transferred to the plastic range,shows that the increase of the high pier reduces the seismic behavior of the bridge pier.So when the earthquake to choose suitable high pier.(3)Analysis of high pier and isolation bearing type,site,fortification intensity concluded that the influence of such factors on the isolation rate under different conditions of high pier,17 m high pier beam of earthquake response,vibration isolation effect is good,as a reference for bridge seismic effect;By means of friction pendulum bearings,high damping rubber bearing,lead rubber bearing isolation rate analysis,such as high damping isolation rubber bearing on the pier shear failure has good vibration isolation effect,lead core rubber isolation bearing is mainly the moved to beam vibration isolation effect is better;The friction pendulum isolation bearing can have bending effect.Under the condition of different sites and different intensity analysis of bridge isolation rate,high damping isolation bearing isolation rate of the Hollywood,Sanfer wave are large,isolation effect is obvious.In different intensity,the seismic fortification intensity of 8 degrees,whether it is suitable to or transverse to the bridge,bridge pier top displacement of the isolation rate is maximum,and moving beam position isolation rate is minimal.