Flexural fatigue behavior of FRP-reinforced UHPC tubular beams

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL Engineering Structures Pub Date : 2025-05-01 Epub Date: 2025-02-08 DOI:10.1016/j.engstruct.2025.119848

Tian-Hui Fan , Jun-Jie Zeng , Xianwen Hu , Jun-Da Chen , Ping-Ping Wu , Hui-Tao Liu , Yan Zhuge

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Abstract

Fiber-reinforced polymer (FRP) reinforced ultra-high-performance concrete (UHPC) tubular structures offer excellent corrosion resistance and mechanical properties, making them ideal for offshore construction applications such as bridge decks and girders. This paper investigates the flexural performance of FRP-reinforced UHPC tubular beams under static and fatigue loading, focusing on the effects of polyethylene (PE) and steel fibers. Results show that steel fiber-reinforced beams have higher load resistance under static loads, while both fiber types exhibit similar fatigue life under equivalent fatigue loads, despite differences in crack evolution and strain. Steel fibers reduce GFRP bar deformation but cause faster UHPC degradation. Fatigue tests revealed up to a 48.86 % reduction in residual load capacity for PE fiber-reinforced beams. A fatigue endurance limit of 0.5 Pu is recommended for FRP-UHPC tubular structures in fatigue-critical applications.

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frp增强UHPC管状梁的弯曲疲劳性能

纤维增强聚合物（FRP）增强高性能混凝土（UHPC）管状结构具有优异的耐腐蚀性和机械性能，使其成为海上建筑应用的理想选择，如桥面和大梁。本文研究了frp增强UHPC管梁在静载和疲劳荷载下的抗弯性能，重点研究了聚乙烯（PE）和钢纤维的影响。结果表明：钢纤维增强梁在静荷载作用下具有更高的抗荷载能力，而在等效疲劳荷载作用下，两种纤维的疲劳寿命相似，但裂纹演化和应变存在差异；钢纤维减少GFRP钢筋变形，但导致UHPC降解更快。疲劳试验显示，PE纤维增强梁的残余载荷能力降低48.86 %。在疲劳临界应用中，推荐FRP-UHPC管状结构的疲劳耐久性极限为0.5 Pu。

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来源期刊

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.