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Determining the Transfer Length in Prestressed Concrete Railroad Ties Produced in the United States. Final Report.
| 题名： | Determining the Transfer Length in Prestressed Concrete Railroad Ties Produced in the United States. Final Report. |
| 作者： | Beck, B. T.; Eby, M. K.; Murphy, R.; Peterman, R.; Zhao, W. |
| 关键词： | Concrete Railroad Ties; Crossties; Strand Bond; Tranmission Length; United States; Wire Bond |
| 摘要： | This paper presents results from transfer length measurements on prestressed concrete railroad ties. Results are shown from the four main producers of concrete ties in the United States. Six prestressed concrete tie plants were visited by the research team to measure transfer length on ties with various mix designs and prestressing reinforcement. After all plants had been visited, a total of nine concrete-mix designs and 10 reinforcement variations were tested. Overall, 220 transfer length measurements were conducted on prestressed concrete railroad ties during the duration of this research project. This was the first coordinated effort to measure transfer lengths in concrete railroad ties ever conducted in the industry. Concrete strains were monitored using the standard Whittemore gage, as well as a non-contact procedure called laserspeckle imaging (LSI). This method to measure transfer lengths was developed at Kansas State University (KSU). Ties measured using the Whittemore gage were sent back to the civil engineering structural laboratory at KSU for the longterm measurement of transfer lengths. |
| 报告类型： | 科技报告 |
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