The stability of seamless track with guard rails on bridge is intricately affected by various structural defects,such as damage ballast-retaining plates,voided sleepers,or failed fasteners.To clarify the relationship between these defects and the stability of the seamless line,a finite element model incorporating guard rails was developed.The results indicate that,under single-defect conditions,such as damage ballast-retaining plates,voided sleepers,or failed fasteners,the allowable temperature rise decreases,leading to a reduction in track stability.Furthermore,when comparing voided sleeper conditions with fastener failures under equivalent scenarios,the critical temperature rise for voided sleepers is slightly higher than that for failed fasten-ers.In cases involving combined defects,once the number of failed fasteners exceeds two,if the number of failed fasteners sur-passes that of voided sleepers,the allowable temperature rise becomes independent of the number of voided sleepers.This study pro-vides a theoretical basis for the maintenance and repair of seamless lines on bridges,ensuring the safe operation of the track system.
关键词
桥上无缝线路/轨道结构/有限元/缺陷特征/允许升温幅度
Key words
seamless line on bridge/track structure/finite element/defect characteristics/allowable temperature rise
维普
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