原文传递
Application of Optimized Prestressed Concrete I-Girder; Final rept
| 题名： | Application of Optimized Prestressed Concrete I-Girder; Final rept |
| 作者： | Tadros, M. K.; Einea, A. |
| 关键词： | Prestressed concrete; Beams(Supports); I beams; Post tensioning |
| 摘要： | Implementation of the recently developed Nebraska University I-girders (NU Girders) in bridge design and construction was initiated under this research project. The University of Nebraska's research team, in cooperation with Nebraska Department of Roads, Bridge Division, the local precast concrete industry representatives, and local engineering firms transformed the NU girders from concept to reality. Several production concerns by bridge designers and fabricators were investigated by casting trial segments of NU 2000. The concerns include: (1) flowability of concrete throughout all girder parts especially the bottom flange, (2) the possibility of aggregate segregation during casting, (3) the difficulty of stripping the forms with the relatively small slope of the bottom surface of the top flange, and (4) the use of welded wire fabric versus conventional reinforcement bars. Standard reinforcement details using welded wire fabric were developed for the girders. Design aids in the form of charts, tables, and simplified equations were developed to help engineers in the preliminary selection of girder sizes for both pretensioned and post-tensioned girder bridges. For post-tensioned girders, a new haunched section was developed for use in spliced post-tensioned girder bridges. The new haunched section significantly increases the span capacity of the NU post-tentioned girders. |
| 总页数： | 274p |
| 报告类型： | 科技报告 |
相关文献
- Structural Behavior of Ultra-High Performance Concrete Prestressed I-Girders.
- Applications of Partial Depth Precast Concrete Deck Panels on Horizontally Curved Steel and Concrete Bridges.
- Repair and Strengthening of Distressed/Damaged Ends of Prestressed Beams with FRP Composites.
- Design of Structures, 2006. Transportation Research Record. Journal of the Transportation Research Board, No. 1976.
- Three Innovative Concepts for Short Span Steel Bridges.
- FEDERAL HIGHWAY ADMINISTRATION'S HORIZONTALLY CURVED STEEL BRIDGE RESEARCH PROJECT: AN UPDATE.
检索历史
应用推荐
