期刊
JOURNAL OF TRANSPORTATION ENGINEERING PART A-SYSTEMS
卷 144, 期 3, 页码 -出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/JTEPBS.0000125
关键词
Concrete sleeper; Field instrumentation; Rail transit; Light rail; Heavy rail; Flexural strength; Bending moments
资金
- United States Department of Transportation (USDOT) Federal Transit Administration (FTA)
- CN
- Hanson Professional Services
With use of concrete sleepers increasing for rail-transit applications in the United States, it is becoming more critical to quantify their revenue service flexural demands to improve sleeper design and maintenance practices. Rail-transit concrete sleeper bending moment field data were collected and processed to address topic areas relating to (1)overall field bending moment magnitude relative to design moments; (2)moment variation from sleeper to sleeper resulting from support conditions; and (3)seasonal variations in moments. Data from field locations on light and heavy rail-transit properties show levels of reserve flexural capacity (factors of safety) that reach as high as 6, significant sleeper-to-sleeper variability attributable to support conditions that can be as high as 100%, and seasonal variation in bending moments that is measurable but far lower than daily variability caused by temperature by a factor of 2. These data provide a valuable baseline for the future generation of mechanistic design standards for track infrastructure components. (C) 2018 American Society of Civil Engineers.
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