Experimental and analytical study on flexural behavior of corroded RC beams strengthened with CFRP rods and UHPC

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2024-11-13 DOI:10.1016/j.engstruct.2024.119299

Wentao Wang , Lei Li , Jing Chen , Kuangyu Dai

{"title":"Experimental and analytical study on flexural behavior of corroded RC beams strengthened with CFRP rods and UHPC","authors":"Wentao Wang , Lei Li , Jing Chen , Kuangyu Dai","doi":"10.1016/j.engstruct.2024.119299","DOIUrl":null,"url":null,"abstract":"<div><div>Recent research confirms that concurrent use of Ultra-High Performance Concrete (UHPC) and Carbon Fiber Reinforced Polymer (CFRP) yields superior strengthening effects on RC structures compared to individual applications. However, this combined strategy is underutilized in research on corroded structure strengthening. This study investigates the flexural behavior of corroded RC beams strengthened with UHPC and CFRP rods through experimental and numerical analyses. A total of 13 RC beams were designed with different corrosion levels (0 %−20 %) and strengthening forms (U-strengthened, T-strengthened). The four-point bending test results indicate a substantial increase in peak moments for the strengthened beams, with U-strengthened beams exhibiting higher bearing capacity than T-strengthened ones. Additionally, the failure mode of the strengthened beams tends to be brittle. Sectional analysis results demonstrate that before the longitudinal reinforcement yield, it mainly governs the sectional moment, while after yielding, CFRP rods control the moment. Moreover, UHPC tensile stress makes a non-negligible contribution to the moment.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119299"},"PeriodicalIF":5.6000,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Engineering Structures","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0141029624018613","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

Abstract

Recent research confirms that concurrent use of Ultra-High Performance Concrete (UHPC) and Carbon Fiber Reinforced Polymer (CFRP) yields superior strengthening effects on RC structures compared to individual applications. However, this combined strategy is underutilized in research on corroded structure strengthening. This study investigates the flexural behavior of corroded RC beams strengthened with UHPC and CFRP rods through experimental and numerical analyses. A total of 13 RC beams were designed with different corrosion levels (0 %−20 %) and strengthening forms (U-strengthened, T-strengthened). The four-point bending test results indicate a substantial increase in peak moments for the strengthened beams, with U-strengthened beams exhibiting higher bearing capacity than T-strengthened ones. Additionally, the failure mode of the strengthened beams tends to be brittle. Sectional analysis results demonstrate that before the longitudinal reinforcement yield, it mainly governs the sectional moment, while after yielding, CFRP rods control the moment. Moreover, UHPC tensile stress makes a non-negligible contribution to the moment.

查看原文本刊更多论文

使用 CFRP 杆件和超高强度混凝土加固的受腐蚀 RC 梁弯曲行为的实验和分析研究

最新研究证实，与单独使用相比，同时使用超高性能混凝土（UHPC）和碳纤维增强聚合物（CFRP）可对 RC 结构产生更佳的加固效果。然而，这种组合策略在腐蚀结构加固研究中却未得到充分利用。本研究通过实验和数值分析，研究了使用 UHPC 和 CFRP 杆件加固的受腐蚀 RC 梁的抗弯行为。共设计了 13 根具有不同腐蚀水平（0 %-20 %）和加固形式（U 型加固、T 型加固）的 RC 梁。四点弯曲试验结果表明，加固梁的峰值弯矩大幅增加，U 型加固梁的承载能力高于 T 型加固梁。此外，加固梁的破坏模式趋向于脆性破坏。截面分析结果表明，在纵向钢筋屈服之前，它主要控制截面弯矩，而在屈服之后，CFRP杆则控制弯矩。此外，UHPC 拉伸应力对弯矩的影响不可忽略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.