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Single-Lane Live Load Distribution Factor for Decked Precast, Prestressed Concrete Girder Bridges.
| 题名： | Single-Lane Live Load Distribution Factor for Decked Precast, Prestressed Concrete Girder Bridges. |
| 作者： | Millam-Jason-L; Ma-Zhongguo |
| 关键词： | Bridge-design; Cracking-; Florida-; Mathematical-models; Prestressed-concrete; Prestressing-; Stirrups-; Tendons-Materials; Tensile-stresses; U-beams |
| 摘要： | Prestressed U-beam bridges compare favorably in cost and appearance to traditional concrete I-beam bridges. Consequently, U-beam bridges are gaining in popularity and usage, especially when aesthetic issues are deemed important. U-beam bridges first appeared in Florida in 2000; however, during construction, cracks developed in the webs of the U-beams. This paper presents results of an analysis of representative cracking of U-beams and proposes a practical method for the transfer zone stirrup design. For the purpose of the analysis, the U-beam is divided into a series of finite shell-plate elements, and the prestressing tendons are simulated as a number of concentrated forces. Two different mechanical models of the U-beams are developed on the basis of the stages of construction. Analytical results show that high tensile stresses occur in the end zone of the U-beam because of the prestressing tendons and that these tensile stresses must be properly considered in bridge design. The research results are applicable to the design of prestressed U-beams and similar types of prestressed girders. |
| 总页数： | Transportation Research Record: Journal of the Transportation Research Board. 2005. (1928) pp134-141 (14 Fig., 3 Tab., 5 Ref.) |
| 报告类型： | 科技报告 |
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