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原文传递 Design analysis and experimental behavior of precast concrete double-tee girders prestressed with carbon-fiber-reinforced polymer strands
题名: Design analysis and experimental behavior of precast concrete double-tee girders prestressed with carbon-fiber-reinforced polymer strands
其他题名: 1.Ahmad,S.2003."Reinforcement Corrosion in Concrete Structures,Its Monitoring and Service Life Prediction—A Review."Cement and Concrete Composites 25(4-5):459-71.
正文语种: 英文
作者: Saverio Spadea
关键词: Basalt fiber;BFRP;bridge;carbon-fiber-reinforced polymer;CFRP;double tee;fiber-reinforced polymer;flexural performance;FRP;girder;prestressing;tensioning
摘要: This paper deals with the design philosophy and the flexural performance under service loads of the precast, prestressed concrete girders constituting the deck of a recently constructed pedestrian bridge. This simple structure combines innovative materials and novel composite manufacturing technologies to ensure that degradation due to steel corrosion does not undermine the longevity of the bridge.The two girders, cast in the shape of double tees with shortened flange overhangs, were prestressed with 0.6 in. (15 mm) diameter, seven-wire carbon-fiber-re-inforced polymer (CFRP) tendons and reinforced with basalt-fiber-reinforced polymer bars. Despite the complexity inherent in its tensioning, CFRP strand has already been used for other prestressed or post-tensioned applications, but never before in large diameters for the fabrication of structural elements with thin cross sections. The selected percentage of the guaranteed capacity of the CFRP tendons applied at jacking was, for the first time, higher than the 65% limit imposed by ACI 440.4R-04 guidelines.A load test was performed at the precasting yard with concentrated loads corresponding to service conditions, with the tested girder remaining uncracked. The strains measured in the reinforcement and the detected deflections of the girder showed agreement with the analytical predictions. CFRP prestressing technology can be used successfully in thin-walled concrete sections beyond the limits suggested by current guidelines and without significant technological drawbacks.
出版年: 2018
论文唯一标识: J-30Y2018V63N01033
英文栏目名称: Reinforcement
期刊名称: PCI-Prestressed Concrete Institute Journal
拼音刊名(出版物代码): J-30
卷: 63
期: 01
页码: 72-84
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