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Performance of Two Concrete Bridges at the Facility for Accelerated Service Testing for 500 MGT. Research Results.
| 题名： | Performance of Two Concrete Bridges at the Facility for Accelerated Service Testing for 500 MGT. Research Results. |
| 关键词： | *Railroads-; *Facility-for-Accelerated-Service-Testing; *Concrete-bridges; *Tests-.;Performance-; Million-gross-tons; Rail-load-traffic. |
| 摘要： | Two new precast concrete bridges were installed by the Transportation Technology Center, Inc. (TTCI), a wholly owned subsidiary of the Association of American Railroads (AAR), Pueblo, Colorado, at the Facility for Accelerated Service Testing (FAST) in December 2003. The bridges have accumulated 517 million gross tons (MGT) of 315,000-pound gross rail load traffic (GRL). A variety of long- and short-term tests are underway. Ongoing testing is funded by AAR and Federal Railroad Administration. To date, the concrete box girder spans have performed well with a structural strength under 315,000-pound GRL traffic. In-field repairs (prior to installation) of girder-end damage have performed well, with no deterioration of the repaired areas noted by TTCI to date. Deterioration of the concrete bridges thus far at FAST includes cracking in ballast curbs, wear at lateral restrainers, an end corner crack near a bearing pad, and bent and broken anchor bolts near lateral restrainers. These concrete bridges on a 5-degree curve provide a challenging environment for track ties and fasteners, with significant degradation noted in less than 300 MGT, including broken ties, broken tie plates, and loose screw spikes. Concrete bridges are the most commonly constructed railroad bridges in recent years. They are typically the preferred replacement for timber trestles. Because of the significant investment being made in concrete bridges, it is prudent to understand their response to heavy axle load traffic. |
| 报告类型： | 科技报告 |
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