The Analysis Of Seismic Response Of Railway Curved Rigid Frame Continuous Bridge

At present, China is one of the largest countries constructing continuous rigid frame bridge. As the bridge is decided by the line in the design of railway line, constructing long span curved bridge is inevitable. Because of the particular of curved rigid frame continuous bridge, the research on the dynamic characteristics of curved bridge in particular of the seismic response characteristic is less. To ensure the smooth flow of traffic and transportation and reduce the loss of seismic damage, there is important significance to study the regular pattern of the seismic response of curved rigid frame continuous bridge and improve the ability of earthquake resistance.The seismic response of curved rigid frame continuous bridge is complex. The thesis constructs the spatial finite element model of bridge structure to calculate dynamic characteristic by using large general-purpose finite element software ANSYS and analysis the seismic response of structure by the method of both response spectrum analysis and time history analysis. The research consider that both the selection of the input direction of ground motion and railway live load affect the seismic response of structure. From the key design parameters of curved beam bridge structure, the research consider the effect of the different height of pile, the different connection between pile and beam and the change of deck longitude to seismic response of curved beam bridge.The analysis result of the dynamic characteristic of structure and the seismic response shows that the seismic calculation of the bridge using pile foundation needs to consider the inter structure dynamic action of soil and pile. Owing to the main direction of the response of curved beam is uncertainty, the most unfavorable direction of the seismic input should be considered from multiple perspectives. In longitude, the seismic analysis of curved bridge should consider the effect of both the railway live load and the unfavorable combination of load. The method of both response spectrum analysis and time history analysis could verify and supplement each other to ensure the reliability of the result. The change of the key design parameters of curved beam bridge structure would affect the seismic response of structure.