Study on the Influence of Wind Barrier Porosity on Train-Bridge Coupling Vibration of Heavy-Haul Railway of Rigid Frame-Continuous Beam under Strong Wind
Study on the Influence of Wind Barrier Porosity on Train-Bridge Coupling Vibration of Heavy-Haul Railway of Rigid Frame-Continuous Beam under Strong Wind
To investigate the effect of wind barrier porosity on the train-bridge coupling vibration of heavy-haul railway of rigid frame-continuous beam under strong wind,the aerostatic coefficients of the train-bridge system were obtained through section model wind tunnel tests when five different pored wind barriers were installed on the bridge,namely 0％,20％,40％,60％,and 100％(without wind barriers).Then the simulation calculation and analysis models of wind-train-bridge coupling vibration were established according to the principle of total potential energy with stationary value in elastic system dynamics.The dynamic simulation calculation and analysis of the wind-train-bridge system for heavy freight trains at different running speeds was carried out by setting the rigid frame-continuous beam bridge with wind barriers at different porosity.The results show that the peak lateral displacement of the bridge significantly decreases with the increase of porosity in the early stage of train operation on the bridge,while the peak lateral displacement of the bridge barely change with the increase of porosity when the train operation tends to fill the bridge.For the dynamic response of trains,the peak value of the train dynamic response increases with the increase of the wind barrier porosity.Compared with fully loaded trains,the dynamic response of unloaded and mix-marshalling freight trains is more sensitive to changes in the wind barrier porosity.Considering the dynamic response of bridge and the evaluation indexes for train running safety(derailment coefficient and wheel load reduction rate),it is recommended to set up a wind barrier with 40％porosity rate for the bridge studied in this paper.
维普
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