The rapid development of high-speed railways has promoted the widespread use of dual-use long-span cable-stayed bridges for crossing large rivers and valleys. However, the complex loading conditions associated with these structures introduce significant uncertainties in track geometry evolution, posing challenges for reliability assessment and potentially affecting the safety and performance of railway operations. To address these challenges, this study establishes an integrated finite element model of a dual-use long-span cable-stayed bridge with ballastless track. The model is used to simulate the evolution of track geometry under different loading conditions, showing that long-wave vertical track irregularities exhibit multiple peaks, with the maximum deviations generally occurring near the bridge towers. A reliability assessment framework based on point estimation and higher-order moment theories is proposed to quantitatively assess the reliability of track geometry under the combined effects of highway loads, train loads, and temperature variations. The findings provide a systematic understanding of track geometry behavior on dual-use cable-stayed bridges and offer a robust methodological basis for ensuring the safety, reliability, and operational efficiency of high-speed railway systems on complex bridge structures.
Xunyi Yin — State Key Laboratory of Safety, Durability and Healthy Operation of Long Span Bridges, Nanjing, Jiangsu, 211189, China; School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China; Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China
Weiqi Zheng — State Key Laboratory of Safety, Durability and Healthy Operation of Long Span Bridges, Nanjing, Jiangsu, 211189, China; School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China
Chao Lin — School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China
Yonghong Yang — School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China; Shanghai-Hangzhou Railway Passenger Dedicated Line Co. Ltd., Shanghai, 200030, China; Shanghai State Railway Engineering Construction Management Co. Ltd., Shanghai, 200030, China
Xingwang Sheng — School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China
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