Excessive fastener spacing of high speed railway ballastless track at beam end by the construction errors and environment temperature

• Published in: Journal of mechanical science and technology Vol. 36; no. 8; pp. 3815 - 3824
• Main Authors: Zhang, Moyan, Xiao, Hong, Wang, Jiaqi, Fang, Shuwei, Jiang, Ziqing
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Mechanical Engineers 01-08-2022; Springer Nature B.V; 대한기계학회
• Subjects: Ambient temperature; Bridge construction; Bridges; Control; Dynamical Systems; Engineering; Errors; Fasteners; High speed rail; Highway construction; Industrial and Production Engineering; Mechanical Engineering; Original Article; Railway construction; Railway engineering; Railway tracks; Safety; Static characteristics; Vibration; 기계공학; Environmental temperature; Thermal-mechanical track-bridge coupling; Beam end; High speed railway; Fastener spacing
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-022-0705-6

Excessive fastener spacing, which results from construction errors (the bridge construction error and the track layout error) and environment temperature, is a possible safety risk for train and track structure. To address this problem, this paper selected a CRTSIII ballastless track-bridge section as the engineering case, and established a thermal-mechanical track-bridge coupling model. The maximum fastener spacing was calculated based on the model, and the dynamic and static characteristics of train and track under the different fastener spacing were compared. The results show that under the combination of construction errors and ambient temperature, the most unfavorable fastener spacing is 755 mm; with the increase in fastener spacing, the longitudinal resistance of fasteners first reaches the limit in the static safety indexes; the rail vertical dynamic displacement first reaches the limit in the dynamic safety indexes. Therefore, maximum fastener spacing of CRTSIII ballastless track structure depends on railway operation and maintenance, train speed and local environment.