Research On Comfort Evaluation Of Pedestrian Bridge Across The Railway Line Under The Effect Of Train Induced Wind

Railway station constructions are facing great challenge during the significant period of therapid Chinese railway development. The new railway station has converted to acomprehensive city traffic hub, regardless of railway speeding up, the converting of railway tobus and the emergence of passed station.The train induced wind load generated by the highincrease of railway speed will result in the air fluctuation around the train which has been paidattention by the researchers gradually. The higher the train runs, the more air fluctuation willbe generated around it; the pressure wave is then stronger which will also have high influenceto the nearby buildings, establishment, human, and etc. In the railway station construction, thecross-line bridge is one of the important components. Different from the pedestrian bridge, thecross-line bridge will be under the train induced wind load. However, references according tothe influence of the train induced wind load to the cross-line bridge are limited.In this thesis, the cross-line bridge vibration type and self-vibration frequency have beenanalyzed and achieved by using the finite element analysis software SAP2000. Upon theresearching results corresponding to the train induced wind characteristic and the pedestrianloads, a pressure change curve has been achieved which changes from the positive to negativein value and declines along the driving direction and the perpendicular direction, respectively.It has also been converted to the induced wind load model, a pedestrian loads model has beenassured taking into account the characterization of the actual project, moreover, a dynamicresponse analysis has been carried out.The acceleration curves, the displacement curves on different joints corresponding to therunning time have been achieved. Analyses have been carried out on the changing regulationof the maxi&mini value and the influences from the train induced wind loads to the trainacceleration and the displacement. It has been observed that the train induced loads have lowinfluence to the bridge displacement. The maximum vertical acceleration increases along thedriving direction. Along the direction perpendicular to the train, the influence declines twoboth sides of the bridge and arrives at the maximum value at the boundary of the bridge. Comparing the comfort evaluation indicators and the comfort standard, several typicalcomfort evaluation standards have been selected to evaluate the actual project and personalopinions have been given.