Bridge-Rail Interaction of Small Radius Curved Bridges and the Effect of Fastener Resistance under Temperature Variation
An integrated spatial finite element model of rail-bridge-pier was developed and validated to investigate the effect of temperature on the interaction between bridges and rails,particularly focusing on small-radius curved bridges used by trams.This study compared and analyzed the bridge-rail interaction laws between straight bridges and small-radius curved bridges.It specifically examined the additional expansion force of the rail,lateral forces at the top of bridge piers,and longitudinal forces under overall and local heating conditions.Under overall heating conditions,the research found that small-radius curved bridges experience greater lateral displacement of the steel rail and higher lateral forces at the top of bridge piers compared to straight bridges.Moreover,as the bridge temperature increased,the additional expansion force of the rail also increased.Calculations using overall heating conditions resulted in larger expansion forces and longitudinal forces on the top of piers compared to local heating conditions.Based on these findings,three different fastener arrangement schemes were proposed and evaluated.It was observed that fasteners with lower resistance could effectively reduce the additional expansion force of the rail.However,insufficient longitudinal resistance might increase the risk of rail joint fractures.In conclusion,the study provides valuable insights for designing continuously welded rails on small-radius curved bridges for tram systems,offering guidance on optimizing fastener arrangements to mitigate rail expansion effects while ensuring structural integrity.
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