Static And Dynamic Analysis And Train Running Safety Analysis Of Shanghai-nantong Tiansheng Port Channel Bridge

At present,steel truss flexible arch bridges are widely used because of their novel structure,clear force,and convenient construction.Therefore,it is necessary to conduct in-depth research on such bridges.Among them,the newly-built Shanghai-Nantong Tiansheng Port Channel Bridge has the longest span in its kind.In order to further understand the mechanical characteristics and operating conditions of such bridges,and to provide a basis for the structural health monitoring of bridges,this article uses this bridge as the research background.The corresponding static and dynamic research of the bridge is performed by using the finite element software ANSYS and the dynamics software SIMPACK.The main contents of the research are as follows:(1)The basic situation of the Shanghai-Nantong Tiansheng Port Channel Bridge is introduced,such as project overview,material properties,geometric dimensions,etc.Based on the above content,the full bridge space model of the bridge was established by using ANSYS,and the reliability of the model was verified through the deformation and modal comparison analysis of the bridge model.(2)Perform static analysis on the established bridge model.By comparing the deformation of the bridge under different load conditions,the main load factors that affect the response of each bridge and the load combination that controls the response are determined,and the maximum value of the response is determined by the control load combination of each bridge response;The analysis of internal forces and stresses determined the maximum position of the bridge force.As a result,the monitoring indicators and monitoring points of bridge structural health monitoring were initially determined,which provided a basis for future monitoring schemes of bridge structural health monitoring.(3)Using SIMPACK as a platform to build a high-speed rail vehicle model,verify the dynamic performance of the established EMU model,then briefly describe the possibility of vehicle-bridge vibration simulation analysis,and summarize the evaluation indicators of vehicle-bridge vibration simulation analysis.Considering the large span of the bridge and the effect of the additional deformation of the bridge on the train safety under different load combinations,the safety of the train passing through the bridge with additional deformation was analyzed.The results show that the additional deformation of the track will deteriorate the safety and smoothness of the driving,but all the indicators are within the limits and no danger will occur.(4)Taking the Shanghai-Yongtze River Yangtze River Bridge’s special channel bridge as a calculation example,the bridge flexible body is imported into SIMPACK,and the vehicle-bridge vibration simulation analysis of the bridge is implemented according to the existing train model.Evaluation of driving safety and comfort.The final results show that the faster the train crosses the bridge,the more violent the dynamic response of the bridge and train,but the dynamic response of the bridge and train meet the limit requirements and will not affect the safety of the train.