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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Zhao, Weixin Beck, B. Terry Robert, J. Peterman Murphy, Robert Wu, Chih-Hang John Lee, Grace |
| Copyright Year | 2013 |
| Abstract | This paper presents the detailed analysis of surface strain data obtained at six prestressed concrete tie plants in the United States. These data were obtained by the authors by conducting a total of 220 transfer length measurements on prestressed concrete railroad ties with different concrete-mix designs and reinforcement variations. The surface strain profiles of the railroad ties were obtained using the traditional Whittemore gage, as well as a rapid non-contact technology, called laser-speckle imaging (LSI), that was previously developed by the authors. The LSI technique achieved a microstrain resolution comparable to that was obtained using mechanical gauge technology. The measured surface strain profiles were then analyzed by both the 95% AMS (95% Average Maximum Strain) method, and the ZL (Zhao-Lee) method that was recently proposed by the authors. The ZL method is an unbiased statistical method that provides a more accurate and reliable transfer length determination. A direct comparison between the 95% AMS method and the ZL method was achieved by applying both methods to determine the 220 railroad tie transfer length values. The comparison confirmed the bias of the 95% AMS method in estimating transfer length value, as predicated by theoretical analysis. |
| Sponsorship | Rail Transportation Division |
| File Format | |
| ISBN | 9780791855300 |
| DOI | 10.1115/JRC2013-2469 |
| Conference Proceedings | 2013 Joint Rail Conference |
| Language | English |
| Publisher Date | 2013-04-15 |
| Publisher Place | Knoxville, Tennessee, USA |
| Access Restriction | Subscribed |
| Subject Keyword | Concretes Imaging Railroad ties Laser speckle Prestressed concrete Theoretical analysis Resolution (optics) Gages |
| Content Type | Text |
| Resource Type | Article |
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