Influence of the Marshalling and Operation of Heavy Haul Train on Dynamic Response of Double-track Bridge
Research purposes:In order to study the influence of marshalling and operation of heavy haul train on dynamic response of double-track bridge,selecting a 32 m prestressed concrete double-track simply-supported T-beam on the Shuozhou-Huanghua railway line as the research object,the coupling finite element model of heavy haul train-track-bridge was established,and the accuracy of the finite element model was verified through field tests.The dynamic response of heavy haul trains passing through double-track bridges was studied,and the influence of different marshalling modes and single-track and double-track operation of heavy haul trains on the dynamic response of double-track bridges were analyzed.Research conclusions:(1)The calculated results are in good agreement with the measured values,indicating the high reliability of the coupled finite element model of heavy haul train-track-bridge.(2)The loaded train marshalling has the greatest impact on the displacement response and dynamic strain of the bridge,and the smallest impact on the acceleration.The acceleration response of empty train marshalling to the bridge is the largest.The mixed marshalling of empty and loaded train takes the second place,and the mixed marshalling of empty vehicles in front of empty vehicles in the rear has a greater impact on the displacement response of empty vehicles,which may cause the derailment of empty vehicles.(3)The dynamic response of the bridge under double-track operation of loaded and empty vehicles increases with the increase of vehicle speed,which is similar to the loaded vehicles.The peak value of vertical dynamic response of the bridge under the double-track split operation is slightly larger than that under the single-track operation,while the peak value of transverse dynamic response of the bridge is smaller than that the single-track operation.(4)When the distance difference between the loaded vehicle and the empty entering the bridge is an integral multiple of the length of the vehicle body,the peak dynamic response of the bridge is basically the same as that when the loaded vehicle and the empty vehicle enter the bridge at the same time.When the distance difference into the bridge is an integral multiple of half the length of the vehicle body,the peak dynamic response of the bridge decreases.(5)The research results can have a reference for the design of new heavy haul railway double-track bridge.
marshalling of traindouble-track bridgefinite element modelfield testdynamic response
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