{"title":"Empirical and precise finite element modelling of bond-slip contact behavior between heat-damaged concrete and anchored CFRP composites with groove","authors":"Rajai Z. Al-Rousan, Bara’a R. Alnemrawi","doi":"10.1016/j.engstruct.2025.120042","DOIUrl":null,"url":null,"abstract":"<div><div>Predicting the overall capacity of Reinforced Concrete (RC) structures strengthened with Carbon Fiber Reinforced Polymers (CFRP) is challenging due to the difficulties in addressing their bond strength accurately. Concerns regarding the predicting accuracy are induced, including debonding probability, strengthening anchorage, and constituent material’s degradation due to sudden action such as exposure to high temperatures. This study presents a new bond-slip relationship for predicting the bond-slippage behavior of groove-anchored CFRP-strengthened members exposed to heat-damage effect using the nonlinear finite element analysis (NLFEA) method. The new model was generated using various high-temperature levels from 23° C to 800° C, CFRP bonded length (L<sub>f</sub>) (0.1 L<sub>c</sub>(length of the concrete specimen) to 1.0 L<sub>c</sub>), CFRP bonded width (b<sub>f</sub>) (0.1b<sub>c</sub>(width of the concrete specimen) to 1.0b<sub>c</sub>), and anchored groove numbers (0−3). The simulation was accomplished using ANSYS software and its accuracy was ensured using the precisely captured lateral strain values and overall distribution within the CFRP strips at the interface area. It was observed that normal and lateral stress contours were irregularly distributed within the CFRP strip width, whereas a regular distribution was captured in the other two directions. The new models were compared with experimental and theoretical models from the literature where high predictability was demonstrated compared to high disturbance and errors for the other existing models.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120042"},"PeriodicalIF":5.6000,"publicationDate":"2025-03-09","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/S014102962500433X","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
Predicting the overall capacity of Reinforced Concrete (RC) structures strengthened with Carbon Fiber Reinforced Polymers (CFRP) is challenging due to the difficulties in addressing their bond strength accurately. Concerns regarding the predicting accuracy are induced, including debonding probability, strengthening anchorage, and constituent material’s degradation due to sudden action such as exposure to high temperatures. This study presents a new bond-slip relationship for predicting the bond-slippage behavior of groove-anchored CFRP-strengthened members exposed to heat-damage effect using the nonlinear finite element analysis (NLFEA) method. The new model was generated using various high-temperature levels from 23° C to 800° C, CFRP bonded length (Lf) (0.1 Lc(length of the concrete specimen) to 1.0 Lc), CFRP bonded width (bf) (0.1bc(width of the concrete specimen) to 1.0bc), and anchored groove numbers (0−3). The simulation was accomplished using ANSYS software and its accuracy was ensured using the precisely captured lateral strain values and overall distribution within the CFRP strips at the interface area. It was observed that normal and lateral stress contours were irregularly distributed within the CFRP strip width, whereas a regular distribution was captured in the other two directions. The new models were compared with experimental and theoretical models from the literature where high predictability was demonstrated compared to high disturbance and errors for the other existing models.
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.