Analysis Of Dynamic Performance Of Curved Continuous Girder Bridge Under Seismic Action

Seismic response analysis of bridges is necessary in a seism,because it often causes severe economic losses.Compared with the linear bridge,the curved girder bridge exists coupling effect of bend-twist.Structural dynamic responses become more complicated under the seismic excitation.Seismic research about the curve continuous beam is relatively less.So this article carried the aspect,researched the dynamic properties of curved continuous girder bridge under seismic effect.At first,this paper summarizes the scholars domestic and abroad for seismic research curve continuous beam bridge.Then it took a four-span curve continuous beam bridge as an example to analyze the influence of different parameters on the seismic behavior of curved continuous girder bridge.On the basis of this,it took the effects of the collision on the curve continuous beam bridge seismic performance into consideration,and analyzed the collision response of the curve continuous beam bridge of different parameters.In the end,it conducted the research on the controlled analysis of the bridge isolation.The main contents are as follows:(1)The seismic response rule of the continuous beam bridge.In order to understand the dynamic response of the continuous beam bridge in the seismic excitation,the paper analyzed a four-span continuous curve girder bridge by means of time-process analysis.It also analyzed the influence of the single model on the dynamic characteristics of the continuous curve girder bridge under different parameters,such as the central angle,the height of the pier and the input angle of the seismic input.(2)The analysis of the collision mechanism of the beam bridge.This paper introduced a wide range of structural seismic analysis methods and models,including recovery factor method,contact element method and 3d contact friction model.Based on the finite element analysis software,it conducted the research on the curve continuous beam bridge under seismic excitation in the process of collision types of seismic waves,seismic input angle,pier height and different parameters,such as expansion joint spacing on the collision force and displacement of curved beam,pier bottom bending moment and shear force,the influence law of dynamic response to analyze the continuous curve girder bridges under seismic action collision mechanism and the rule of the collision response.(3)The analysis of the vibration control of the beam bridge.This paper briefly introduced the basic concept and principle of the shock absorber together with the principle and the mechanical model of the damping vibration and the high damping rubber bearing.It established the finite element model based on the collision of the original curve continuous girder bridge model on the basis of reducing isolation measures and analyzed the shock absorption measures after the collision response of the curve beam bridge model and compared with the models without taking shock absorption measures so as to verify the method of reducing vibration isolation control effect.