Study On Bilateral Coupled Effect Of Friction Pendulum Bearing And The Effects For Seismic Performance Of Curved Bridge

China is a country that earthquakes occur frequently.In previous earthquakes,lots of earthquake damage has occurred in Curved Bridge such as girder falling,bending and shearing failures in pier,whole collapsing etc.This damage because of the two reasons below: first,the seismic responses for Curved Bridge complex than straight bridge.So it is difficult to give accurate and efficient modeling and analysis methods for different design parameters Curved Bridge.Second,aimed at isolation bearing,lack of precise analysis of theory combined with experiment.Above two reasons cause actual curve bridge seismic response differ with the simulation results which led bridge response under real earthquake other than simulation results.As the result,earthquake damage occurred.In tackling these questions,this paper choose a typical curve bridge as the research object.The curve bridge for different parameters(central angle 67°~0°,width-span ratio 2.78~1.67,slenderness ratio of pier 3.0~7.6)comparative analysis for different modeling methods.Meanwhile,designed six friction pendulum isolation bearing used in study on bilateral coupled Effect with experiment and numerical simulation.At last,a curve bridge under seismic damage is analyzed,major contents of which are stated below:(1)Choose a typical curve bridge as the research object,using OpenSEES software,according to different superstructure and infrastructure for Curved Bridge,three different modeling methods were used to modeling.Inquiry into Curved Bridge with different central angle,width-span ratio,height of pier and pier form to get efficient and accurate seismic modeling method.Finally get reasonable modeling method for the research of FPS Isolated Curved Bridge seismic performance.(2)Considering the influence of bearing seismic isolation performance is the friction coefficient which affected by friction velocity,axial forces etc.Also considering the seismic performance of friction pendulum bearing affected by the bilateral coupled effect.Designed a scheme of loading test with different loading speeds,axial forces and biaxial coupling.(3)From bidirectional pseudo-static loading test by FPS bearings,the load-displacement hysteretic curve obtained.Through hysteresis curves,yield force,restoring force,friction coefficient and energy dissipation capacity of the bearing obtained.Through analysis of the experimental results,the influence law with loading speed,axial force,and bilateral coupled effect obtained.Finally,by select a reasonable simulation method,obtain the refined simulation model for the bearing that considered the influence mentioned above.(4)Based on the research above,analyse the seismic response for a Curved Bridge that earthquake damage occurred.Subsequently,compare the simulated results with disasters due to earthquake.The results show that the simulated results from OpenSEES model can simulate real curve bridge seismic response.By using friction pendulum bearing in this bridge,calculated that the seismic reduction effectiveness of FPS is good.As a result,FPS bearing can prevent earthquake damage to Curved Bridges and the difficulty of Bridge repair after earthquake reduced significantly.This paper excogitate refined numerical simulation methods for different forms of Curved Bridge.By experimental analysis,the refined simulation model for FPS bearing which considered bilateral coupled effect obtained.Finally,puts forward seismic analysis method to various types of Curved bridge for bridge designers.