Influence On Pile Foundation In Seismic Response Analysis Of The Concrete Continuous Girder Bridge

In recent years, several earthquakes are happening in the world, it not only allowpeople to awareness of the devastating and catastrophic of the earthquake, but alsoallow scholars began a more in-depth research about the bridge failure mechanism inthe earthquake and more in-depth study of the bridge structure seismic theory in theearthquake, its order is to put forward a better theory of seismic design method. WithChina’s rapid economic development, the span of the bridge is constantly increasing,and the style of the bridge is also in constant innovation, so figuring out the principleof the destruction of the bridge in the earthquake, increasing bridge seismic capacityis of great engineering significance for its service function and safety during ananticipate earthquake. In order to study the impact of the pile-soil interaction to theprestressed concrete continuous girder bridge earthquake response, the main work inthis thesis as follows:(1) This paper briefly describes the research status of the long-span bridgeseismic design and the pile-soil interaction, made a simple introduction to the seismicanalysis methods of bridge and comparing its advantages and disadvantages.(2) This paper used the Jiangxi Kejia Bridge as engineering background, usingMidas Civil2012limited element software established the finite element model I thatnot considered the pile-soil interaction and model II that considered the pile-soilinteraction.(3) By calculating the cumulative effective mode participation mass of thebridge, the minimum number of modes for response spectrum analysis is obtained.Design acceleration response spectrum is selected according to the site condition ofthe bridge to calculate the seismic response of the two finite element model I and IIunder four load conditions.(4) According to the site condition of the bridge, chosen EI-Centro wave as theground motion input to calculate the seismic time-history response of the two finiteelement model I and II under uniform excitation.(5) Comparing the displacement response and internal forces result of the KejiaBridge using the response spectrum method and time history analysis method, drawedthe relevant conclusions that are benefit for similar bridges seismic analysis and design in the future.