Abstract：Research purposes: In order to study the influence of the deformation of bridge structure under temperature load on the running safety on the bridge, taking a concrete-filled steel tube arch bridge of Chengzhou-Guizhou high-speed railway as the research object, a refined finite element model of long-span bridge-track is established based on ANSYS, and the deformation law of structure under the action of different temperature load is analyzed. On this basis, the finite element model of bridge-track structure is imported into SIMPACK for co-simulation, and the train-track-bridge coupling vibration analysis model is established. Finally, the variation rules of dynamic response indexes under different temperature loads and different speed are discussed from the aspects of train operation safety and comfort. Research conclusions: (1) The additional track irregularity caused by the upward deformation of the bridge is more unfavorable than the downward. (2) Under the effect of combined temperature, only wheel load reduction rate exceeds the limit of driving safety index, which is suggested to be taken as the main evaluation standard of running safety for high-speed railway. (3) Temperature gradient is an important reason for wheel load reduction rate exceeding the limit, and the effect of temperature gradient should be considered when analyzing the effect of temperature on train running safety in practical engineering. (4) The vertical Sperling index is very sensitive to the effect of temperature, and in order to ensure driving comfort, the speed of the train should be controlled when running under extreme temperature conditions. (5) The research results can provide reference for the driving safety evaluation of concrete-filled steel tube arch bridge.
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2023, Vol. 40 
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