Seismic Response Analysis Of Curved Girder Bridge With Small Radius And Research On Bearing Damping Effect

With the development of urbanization in China,urban traffic congestion is becoming more and more serious,and a large number of city bridges have been established to relieve the urban traffic pressure.Because of its good adaptability,curved bridge is more common in urban traffic and mountainous roads.The curved girder bridge with small radius is widely used in the road traffic of our country,but because of the unique structure characteristic of the curved girder bridge of the small radius highway,the seismic response law is special,so it is of great significance for the seismic response characteristic of the bridge and the study of the earthquake isolation.In this paper,the seismic response characteristics and design of earthquake-isolation of curved girder bridge with small radius are studied.The main contents are as follows:(1)On the basis of summarizing predecessors ' seismic response research,this paper briefly introduces the earthquake damage and revelation of common bridges,the research status of seismic isolation technology and the research status of curved girder bridge,and explains the basic theory of bridge aseismic.,which provides a theoretical basis for the establishment of small radius curved girder bridge model and seismic response analysis.(2)Using Midas Civil to set up the analysis model of small radius highway curved girder bridge,the influence of the pile-soil interaction on the vibration characteristics of the bridge Pier Design parameters(pier height and wall thickness)is analyzed,and the structural self vibration period increases with the change of the bridge Pier design parameters and the interaction between the pile and soil.(3)Using the response spectrum method,10° as an increment,from 0°~180° as the input direction of seismic wave,to study the most unfavorable seismic excitation direction of bridge structure,and to explore the influence of Pier design parameters(pier height and wall thickness)on the most unfavorable input angle of the structure.The results show that the most unfavorable input angle of bridge structure is 160°,and the design parameters of pier have little influence on the most unfavorable input angle of bridge structure.(4)Using the Time History analysis method,this paper studies the influence of the variable parameters of the fluid viscous damper(FVD),lead rubber bearing(LRB),friction pendulum bearing(FPS),basin type rubber bearing(PRB)and its parameter variation on the seismic response of curved girder bridge with curved girder bridge.The results show that the liquid viscous damper(FVD)and lead rubber bearing(LRB)have a good damping effect on the seismic response of the bridge structure,while the damping effect of the friction pendulum bearing(FPS)is generally the worst of the basin-type rubber bearing(PRB).