The Study On The Seismic Response Analysis And The Seismic Reduce And Isolation Research For High-Pier Long-Span Curved Continuous Rigid Frame Bridge

Abstract:Along with our country highway’s rapid development, because of the demands of the linear route and the limitation of the topographic conditions, curved continuous rigid frame bridge was able to a large number of construction; in recent years due to the increase of span and pier, and the decrease of curvature, high-pier long-span curved continuous rigid frame bridge has a wider application scope and development prospects. But the seismic response and the seismic design of the bridge become more complex at the same time, and there are main problems such as the pile-soil effect, the height difference of piers, the curvature of bridge, the input of earthquake, the seismic reduce and isolation, etc. This paper, taking the Shayingou bridge in Guizhou as engineering background, make an intensive study of the seismic response analysis and the seismic reduce and isolation research for high-pier long-span curved continuous rigid frame bridge.1)Carry out the research into the seismic response analysis for high-pier long-span curved continuous rigid frame bridge. Considering the pile-soil-structure interaction with the improved Penzien model, establishes the dynamic analysis model of the full bridge for dynamic characteristics analysis, response spectrum analysis and time-history analysis. Compared to straight bridge, the seismic response analysis for high-pier long-span curved continuous rigid frame bridge is more complex, and should be combining with the results of the response spectrum analysis and the time-history analysis and considering all the most unfavorable combination of seismic response component to guide design.2)Carry out a large number of parameter analysis. Research into the influence of radius of curvature, height difference of piers, direction of earthquake excitation and traveling wave effect to the seismic response of high-pier long-span curved continuous rigid frame bridge. Under the same conditions, the smaller the radius of curvature and the greater the height difference of piers, the seismic performance is poorer; along and across the direction of the bridge are the most unfavorable directions of earthquake excitation; the influence of the traveling wave effect to the seismic response of the bridge is more complex, and the overall impact on the bridge is small.3)Carry out the seismic reduce and isolation reseach on the lead rubber bearing and the swing lift-off type pile foundation structure for high-pier long-span curved continuous rigid frame bridge. According to the nonlinear time-history analysis obtained that the lead rubber bearing for the effect of the seismic reduce is good; the swing lift-off type pile foundation structure for the effect of the seismic isolation is remarkable, and will have good application prospects in the seismic reduce and isolation of bridge.