Development of a Guide for Prioritization of Railway Bridges for Repair and Replacement
| 项目名称： | Development of a Guide for Prioritization of Railway Bridges for Repair and Replacement |
| 摘要： | The objective of this study is to develop a guide for evaluation and prioritization of repair, rehabilitation and replacement for existing railway bridges. The research project will involve review and analysis of the major factors that influence structural performance, e.g., degree of corrosion, loss of material (section loss, holes), cracking and spalling of concrete, bearing problems, loose connections, traffic volume (number of cars/trains and tonnage), and bridge importance for the railroad network. However, these factors are random in nature; therefore, it is convenient to consider reliability as a measure of performance. The relationship between various conditions and ability to perform the required function (i.e., carry the freight trains) will be established in form of limit state function(s). The statistical parameters will be determined for each factor using the available data, by Monte Carlo simulations and, if needed, also by the so-called Delphi process. The reliability as a measure of structural performance will be expressed in terms of a reliability index. Reliability indices will be calculated for selected representative railway bridges, and based on the results, a target reliability index will be selected. The sensitivity analysis will be performed to establish the relationship between the load and resistance factors and reliability, to be presented in the form of graphs and tables. The results will serve as a basis for the development of a decision-making spreadsheet. The final report will document research and provide a tool for bridge owners for prioritization of structures for repair/rehabilitation or replacement. |
| 状态： | Completed |
| 资金： | 60404.00 |
| 资助组织： | Research and Innovative Technology Administration |
| 执行机构： | University of Nebraska, Lincoln |
| 开始时间： | 20120701 |
| 实际结束时间： | 20131231 |
| 主题领域： | Bridges and other structures；Construction；Maintenance and Preservation；Railroads |
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