Damper Seismic Effect Analysis Of The Continuous Girder Bridge

Bridge seismic isolation technique is an effective way to resist earthquake, with the continuous development of research in recent years, the traditional seismic technology has been gradually replaced by a new type of seismic technology.Add damper in bridge structure, such as energy shock absorbing device, this approach is considered to be a new, safe, effective and economic way of reducing vibration isolation.Such as damper device safety performance is good, construction simple, gradually be accepted by the experts of all countries in such aspects as structure, seismic strengthening has wide development prospects.This paper first introduces the seismic bridge under the action of earthquake damage, seismic fortification standards, as well as commonly used damper type on the bridge and its mechanical model, by analyzing the response of the bridge under seismic action, it is concluded that the basic theory of reduction of isolation.the basic theory of reducing vibration isolation are obtained. Adopting Finite Element software Midas is to establish finite element model and the time history analysis, to study the dynamic response of the earthquake law.The main content of this paper includes:1. based on dynamic mechanics theory, apply finite element software, establishing the finite element model.2. The three span continuous beam bridge using steel bearing, the laminated rubber bearings and lead rubber bearing, using the nonlinear time history analysis method to calculate the bridge in three kinds of seismic waves under the action of earthquake response.3. In order to study the effect of lead rubber bearing damping performance, based on spatial finite element model, through a large amount of calculation, From the bridge isolated and non-isolated compared to investigate the response of the bridge and non-shock absorber bridge differences, calculate the damping rate, through the numerical of damping ratio to determine the bearing damping effect.