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Improving the Design of U-Beams for Indiana.
| 题名： | Improving the Design of U-Beams for Indiana. |
| 作者： | Frosch, R. J.; Kreger, M. E.; Pavelchak, M. A.; Wesson, M. D. |
| 关键词： | Bridges; Construction; Debonding; Design; Indiana; Loads(forces); Prestressed Concrete; Research Projects; Sheathing; Strands; Structural Beams; U-beams |
| 摘要： | The use of prestressed U-beams, developed as an economical and aesthetic alternative to traditional I-beams, is becoming increasingly common. While U-beams are seeing increased use, questions have arisen in the design of bridges utilizing this girder type. Specific issues include live load distribution, bridge deck behavior, and debonding limits. First, since the U-beam is a new girder type, limited guidance exists for the live load distributions to be used in design. Second, due to the increased stiffness and strength of this girder, fewer girder lines are required resulting in increased deck spans. Finally, current AASHTO debonding limits severely restrict the efficiency and economy of the section. The objective of this research program is to develop design strategies to improve the efficiency and optimize the design of the Indiana modified U-beam with a focus on the concerns related to the design of U-beams. In particular, this research program will evaluate the live load distribution appropriate for the design of U-beams, assess the behavior and design of the bridge deck when supported by U-beams, and evaluate both the shear strength and shear design of the composite U-beam system. It is important that the strength strength of pretensioned concrete beams with debonded strand be fully evaluated. Five phases of research were conducted. The first phase consisted of evaluation of a U-beam bridge constructed in Indianapolis, Indiana to assess the live load distribution factors and flexural deck behavior of this bridge. The second phase evaluated the effectiveness of debonding sheathing to ensure that proper debonding is being achieved. The third phase evaluated the influence of the percentage of debonded strands on shear strength using rectangular and I-shaped cross sections to investigate flexure-shear and web-shear strengths, respectively. While this phase concentrated on the shear strength resisted by the concrete, the influence of transverse reinforcement was als |
| 报告类型： | 科技报告 |
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