| Citation: | LYU Tao, WANG Jinxin, TAN Shehui, WANG Weiqin, XU Weichang, CHEN Rong, WANG Ping. Demonstration of Equivalent Grade Sections for Track Longitudinal Profile on Kilometer-Scale High-Speed Railway Bridges During Operation[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250281 |
The concept of equivalent grade sections was proposed and its reasonable equivalent method was investigated to facilitate the representation and maintenance management of track longitudinal profiles on kilometer-scale high-speed railway bridges during operation. Additionally, the objective includes addressing following problems. There is large deviation between actual and designed longitudinal profiles caused by manufacturing deviations, construction errors, and limited ballast adjustment capacity, which necessitates modification to a continuous short-slope configuration. Temperature loads during operation induce bridge deflections larger at mid-span and smaller at both ends. The actual longitudinal profile evolves into a high-order spatial curve, posing challenges to track maintenance management. By taking the tracks on two in-service kilometer-scale high-speed railway bridges as examples, four equivalent grade sections—the single-grade section, two-grade section, multi-grade section, and 200 m continuous grade section—were first established by comparing grade section lengths and mid-span elevations, simplifying the actual high-order spatial curve profile into a conventional combination of grade sections and vertical curves. Then, key indicators such as acceleration and ride comfort in actual and equivalent longitudinal profile conditions were calculated and compared. Finally, considering the need for simplified track management, the reasonable equivalent method was determined. The results show that for the Wufengshan Yangtze River Bridge, the maximum acceleration deviation between the single-grade equivalent and measured profiles is no more than 0.2 m/s2, and the ratio of resistance difference to tractive force is no more than 15%. For the Husutong Yangtze River Bridge, the maximum acceleration deviation is no more than 0.1 m/s2, and the ratio of resistance difference to tractive force is no more than 8%. The single-grade equivalent for both bridges is basically equivalent to the measured profile and provides a more intuitive representation. Considering train traction capacity, ride comfort, and the need for simplified on-site management, the single-grade equivalent is recommended as the basis for track management during operation.
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