Abstract
In the freight railway bridge, the increase of the train running speed and train axle loads can enlarge dynamic response (DR) of the railway bridges, which leads to excessive vibration of bridges and endangers the structural safety. In this paper, a three-dimensional coupled finite element (FE) model of a heavy-haul freight train-track-bridge (HHFTTB) is established using multibody dynamics theory and FE method, and the DR for the coupled system of HHFTTB are solved by ABAQUS/Explicit dynamic analysis method. The field-measured data for a 32 m simply supported prestressed concrete beam of a heavy-haul railway in China are analyzed, and the validity of the FE model is verified. Finally, the effects of train formation number, train running speed, and train axle loads on DR of the heavy-haul railway bridge structures are studied. The results show that increasing the train formation number only has an influence on DR duration of the bridge structure, rather than the peak value of DR, when the train formation number exceeds a certain number; besides, the train axle loads and train running speed have significant influence on DR of the bridge structure. The results of this study can be used as reference for the design of heavy-haul railway bridges and the reinforcement transformation of existing railway bridges.
Highlights
With its substantial cargo transportation capacity, significant economic and social benefits, development of railway heavy-haul transportation has become important in almost every country around the world [1]
Erefore, a 3D coupling finite element (FE) model of the heavy-haul freight train-track-bridge (HHFTTB) system considering wheel-rail contact relationship is established, based on a supported prestressed concrete beam which is commonly used for Chinese railway bridges. e acceleration, displacement, and strain response of the bridge for heavy-haul freight trains are analyzed and compared with the field test results. e effects of the freight train formation number, axle load, and running speed on dynamic response (DR) of the bridges are studied. e results are significant for the safety operation and maintenance of bridges and provide important information and basis for the design of new heavyhaul railway bridges and the reinforcement transformation of existing railway bridges
(1) e results of numerical simulation have good agreement with the field test, which shows that the proposed FE model of heavy-haul freight traintrack-bridge is reliable
Summary
With its substantial cargo transportation capacity, significant economic and social benefits, development of railway heavy-haul transportation has become important in almost every country around the world [1]. Antolın et al. Advances in Civil Engineering [22,23,24] proposed a coupled dynamic model of high-speed TBS based on the nonlinear wheel-rail force and calculated and analyzed the DR of the vehicle-bridge system. Gou et al [28] conducted a field test and numerical analysis on a continuous girder bridge to investigate the dynamic effects of high-speed trains operation on the bridges. Zhai et al [30] used another 3D finite element model to investigate the dynamic interaction model of highspeed TBS and proposed a method to analyze and assess the ride comfort and operating safety of trains passing through the bridges. Erefore, a 3D coupling FE model of the heavy-haul freight train-track-bridge (HHFTTB) system considering wheel-rail contact relationship is established, based on a supported prestressed concrete beam which is commonly used for Chinese railway bridges. Erefore, a 3D coupling FE model of the heavy-haul freight train-track-bridge (HHFTTB) system considering wheel-rail contact relationship is established, based on a supported prestressed concrete beam which is commonly used for Chinese railway bridges. e acceleration, displacement, and strain response of the bridge for heavy-haul freight trains are analyzed and compared with the field test results. e effects of the freight train formation number, axle load, and running speed on DR of the bridges are studied. e results are significant for the safety operation and maintenance of bridges and provide important information and basis for the design of new heavyhaul railway bridges and the reinforcement transformation of existing railway bridges
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