High-speed Isolation Bridge Seismic Response Considering The Moving Train Load

With the increasing proportion of high speed railway bridge in railway system,the research on seismic response of high speed railway isolated bridge under train load has become an important subject.In this paper and of vehicle bridge coupling system and a moving train load isolation bridges on high-speed railway vibration response of domestic and foreign research development status of the exposition,summed up the existing research results and experience,analysis model is built on the seismic response of the vehicle bridge coupling system,deepen the 7 earthquakes with different magnitudes of isolated bridge with high iron power system research.The main research contents include:(1)Using the finite element software to establish the model of high-speed railway isolated bridge,considering the elastoplastic analysis of the constitutive relationship.According to the parameters of the high speed rail vehicle model,the establishment of MIDAS civil vehicle bridge coupling of high iron bridge isolation dynamic model considering,the bridge does not take into account the train high iron base isolated bridge model and taking into account the vehicle bridge coupled high iron base isolated bridge model of dynamic characteristics were analyzed and compared,to draw meaningful conclusions:does not take into account the train of the high iron bridge model vibration frequency were greater than considering the vehicle bridge coupling model and does not consider the train bridge model and vibration frequency of vehicle bridge coupled model difference is small,in less than 10%.Predictably,the bridge model and vehicle bridge coupling model of self vibration characteristics exist certain differences,overall car bridge coupled system without considering the train bridge system vibration frequency is slightly smaller.(2)Introducing the high iron isolated bridge seismic performance evaluation theory and design method,between China and the United States railway bridge seismic design contrast of basic ideas,key analysis does not consider the vehicle bridge coupling of high iron isolated bridge seismic response,mainly introduced how to establish the train without considering the high iron bridge model,focus on the typical earthquake under the action of seismic response of research and analysis and comparison of the calculation.System analysis and comparison of the train is not considered,in seven seismic waves under high iron base isolated bridge model the elastic plastic analysis and research pier unequal height of full span high-speed railway bridge seismic isolation in the longitudinal and transverse bridge down the vibration response.(3)Considering the seismic action and the vehicle bridge coupled combination model,high iron bridge based on vehicle bridge coupled model in 7 earthquake waves,high iron isolated bridges in seismic elastoplastic analysis,are considered moderate and major earthquake in the high iron isolated bridges along the longitudinal direction and transverse to the ground vibration response analysis.Analysis of the full span bridge with different pier height and different high speed train location and other factors impact the seismic performance of the high iron isolated bridge system,comparative analysis considering the effect of the vehicle bridge coupling and does not consider high iron isolation bridge vehicle bridge coupling vibration response performance of.(4)Focusing on considering moving load of train bridge vibration simulation analysis,analyzing the different high-speed trains at different speed running of high speed railway bridges,high-speed train under moving load beam body vibration response analysis results and those obtained high-speed train under moving load pier vibration response analysis results,the high iron bridges for seismic response of a moving train load bridge.Analysis bridges and piers with different height response.Simulation analysis of the combined bridge and ground motion of moving high-speed train.Bridge dynamic performance of bridge under combined vibration condition.