Long-term behavior of reduced length FRP tendons in post-tensioned steel beam-column connections

IF 5.6 1区 工程技术 Q1 ENGINEERING, CIVIL Engineering Structures Pub Date : 2025-03-04 DOI:10.1016/j.engstruct.2025.119965
Mohamed F.M. Fahmy , Ahmed Samy B.Z. Hassan , Shehata E. Abdel Raheem , Mohamed Abdel-Basset Abdo , Redhwan M. Algobahi
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Abstract

The long-term behavior of different fiber reinforced polymer (FRP) tendons has been investigated experimentally up to 2000 h. Seven half-scaled exterior post-tensioned (PT) beam-column connection subassemblies, containing reduced length basalt fiber reinforced polymer (BFRP), carbon fiber reinforced polymer (CFRP), and glass fiber reinforced polymer (GFRP) tendons, were tested. To simulate the actual loading conditions in real buildings, an equivalent gravity load was applied to each connection subassembly. Also, to investigate the PT force level effect, three PT force levels, up to 50 %, were applied to 10 mm BFRP tendons, while two PT force levels were applied to 10 mm CFRP tendons. Besides, a 20 % PT force level was applied to 10 mm GFRP tendons. In addition, to study the effect of tendons’ diameter on the long-term behavior, PT connection subassembly containing 12 mm diameter BFRP tendons with 30 % PT force level was tested. The maximum PT force losses were almost 6.1, 5.8, 4.0 % for BFRP, CFRP, and GFRP, respectively. Finally, according to the experimental test results, unified relaxation equations were proposed to predict the amount of PT force loss. Consequently, the predicted PT force losses for one-million-hour period were approximately 15.3 and 12.2 % for BFRP and CFRP tendons, respectively.
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来源期刊
Engineering Structures
Engineering Structures 工程技术-工程:土木
CiteScore
10.20
自引率
14.50%
发文量
1385
审稿时长
67 days
期刊介绍: Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.
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