Behaviour Of Reactive Powder Concrete Hollow Core Columns Strengthened With Carbon Fiber Reinforced Polymer Under Eccentric Loading

Naser, Maryam H.; Al-Khafaji, Zainab S.

doi:10.56748/ejse.223293

Cited by 3 publications

(6 citation statements)

References 28 publications

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“…The parametric study evaluated the influence of several opening sizes with/without CFRP on the STM, the load-deflection response, and the stress distribution of the RC deep beam. The finite element model, used in the study, has been validated in several previously published works [29][30][31].…”

Section: Model Development and Validationmentioning

confidence: 99%

“…The two-dimensional truss elements can be used in axisymmetric models to represent components, such as bolts or connectors [33]. Several studies [29][30][31]34] have adopted this mathematical representation to represent the steel reinforcement due to the identical rep-…”

Section: Finite Element Descriptionmentioning

confidence: 99%

“…The twodimensional truss elements can be used in axisymmetric models to represent components, such as bolts or connectors [33]. Several studies [29][30][31]34] have adopted this mathematical representation to represent the steel reinforcement due to the identical representation of obtained results from the mathematical model compared to laboratory samples. The nodes at the supports were restricted against vertical displacement.…”

Section: Finite Element Descriptionmentioning

confidence: 99%

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Numerical Investigation on Effect of Opening Ratio on Structural Performance of Reinforced Concrete Deep Beam Reinforced with CFRP Enhancements

Ali¹,

Assi²,

Abas

et al. 2022

Infrastructures

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Reinforced concrete deep beams are a vital member of infrastructures such as bridges, shear walls, and foundation pile caps. Thousands of dollars and human lives are seriously threatened due to shear failure, which have developed in deep beams containing web openings. This paper investigates numerically the overall behavior of simply supported concrete deep beams reinforced with carbon fiber-reinforced polymer (CFRP) sheets through forty specimens grouped in four groups. The numerical analysis results agreed well with the experimental results in the literature, particularly the visual failure initiation with a failure load difference of nearly 7%. Finite element analyses indicated that the presence of an opening with considerable width reduced the failure load by about 71% compared to the corresponding solid specimens. In addition, the reinforced concrete deep beam samples started to behave differently when the (b/h) ratio increased more than (2.0). The findings showed that the compression stress strut pathway had been disrupted by the web opening leading to stress redistribution, and the structure will behave as two separate members. Thus, the upper web-opening part sustained the most stress, while the part under the web-opening did not show any stress concentration. The numerical stress distribution results showed that the attributed reason is that rebars and openings helped redirect the stresses to the compression strut. Using CFRP sheets with a width of more than 160 mm significantly improved the reinforced concrete deep beam with web-opening due to the increasing confinement to the upper part of the reinforced concrete deep beams with the opening.

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Section: Model Development and Validationmentioning

confidence: 99%

Section: Finite Element Descriptionmentioning

confidence: 99%

Section: Finite Element Descriptionmentioning

confidence: 99%

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Numerical Investigation on Effect of Opening Ratio on Structural Performance of Reinforced Concrete Deep Beam Reinforced with CFRP Enhancements

Ali¹,

Assi²,

Abas

et al. 2022

Infrastructures

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“…There is a current demand for strengthening numerous reinforced concrete (RC) structures, particularly in developing nations (Al-Khafaji et al, 2021;Ali et al, 2022;Falah et al, 2020). The process of demolishing old buildings and constructing new ones is both financially burdensome and time intensive.…”

Section: Introductionmentioning

confidence: 99%

“…These benefits encompass a remarkable capacity for confinement when utilized in the form of a wrapping, exceptional stiffness and strength, extended durability, resistance to corrosion, adjustable thermal features, non-magnetic characteristics, and a lightweight composition (Al-Mekhlafi et al, 2020;Huang et al, 2020;Sayed-Ahmed et al, 2018;Xu et al, 2020). The influence of various parameters on the structural behavior of reinforced concrete (RC) columns strengthened with carbon fiber-reinforced polymer (CFRP) sheets is well-documented in the literature (Dundar et al, 2015;El Maaddawy, 2009;Falah et al, 2020;M W Falah et al, 2022;. Among these variables, the mechanical characteristics of CFRP play a crucial role.…”

Section: Introductionmentioning

confidence: 99%

Study The Behavior of Square Reinforced Concrete Columns Strengthened with CFRP

Al-Khafaji

2023

Electron. J. Struct. Eng.

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There is a scarcity of research regarding the efficacy of Fiber Reinforced Polymer (FRP) confinement on low strength materials. This paper presents the findings of an experimental study that focuses on the behavior of concentrically loaded short concrete columns with low concrete strength, which are confined using CFRP wraps. A set of nine (9) square concrete columns of short length were subjected to testing. The experimental setup consisted of a single unconfined column, referred to as the control column, and eight additional columns that were confined utilizing externally bonded CFRP wraps. These confining schemes were determined based on the findings of a previous study conducted by the authors, which focused on short square columns with smaller cross sections. The study focused on examining the impact of various confinement schemes on the load carrying capacities of columns through the application of concentric uniaxial compression. The implementation of various confinement schemes led to an increase in the load carrying capacities of confined concrete columns, demonstrating the effectiveness of externally bonded CFRP wraps in enhancing the performance of short rectangular concentrically loaded concrete columns. The primary objective of this investigation is to examine the behavior of concrete columns with reinforcement that have been reinforced using carbon fiber composites. The findings demonstrated the efficacy of carbon fibers in the restoration of impaired columns, as evidenced by a notable enhancement in the load-bearing capacity of the columns, ranging from 35% to 90%.

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Study the Behavior of Castellated Steel Column Encasing by Different Reactive Powder Concrete Thickness with Laced Reinforcement

Ghazi

Alshimmeri

2021

KEM

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Castellated columns are structural members that are created by breaking a rolled column along the center-line by flame after that rejoining the equivalent halves by welding such that for better structural strength against axial loading, the total column depth is increased by around 50 percent. The implementation of these institutional members will also contribute to significant economies of material value. The main objectives of this study are to study the enhancement of the load-carrying capacity of castellated columns with encasement of the columns by Reactive Powder Concrete (RPC) and lacing reinforcement, and serviceability of the confined castellated columns. The Castellated columns with RPC and Lacing Reinforcement improve compactness and local buckling (web and flange local buckling), as a result of steel section encasement. This study presents axial load test results for four specimens Castellated columns section encasement by Reactive powder concrete (RPC) with laced reinforcement. The encasement consists of, flanges unstiffened element height was filled with RPC for each side and laced reinforced which are used inclined continuous reinforcement of two layers on each side o0f the web of the castellated column. The inclination angle of lacing reinforcement concerning the longitudinal axis is 45o. Four specimens with four different configurations will be prepared and tested under axial load at columns. The first group was the control group (CSC1) Unconfined castellated steel column, the second group was consists of Castellated columns (web and flange) confined with 17mm of (RPC), welded web, and 6mm laced reinforcement (CSC3). While group three (CSC4) consists of a Castellated steel column same as the sample (CSC3), but without using welding between two parts of the castellated steel column. Groups four and five consist of a Castellated steel column same as sample (CSC4) encased partially with reactive powder concrete (25.5 mm) (CSC5) and full encased flange with reactive powder concrete (34mm) mm (CSC6), respectively. The tested specimens' results show that an increase in the strength of the column competitive with increasing the encased reactive powder concrete thickness. And the best sample was sample CSC6 with (34mm) mm in experimental and ABAQUS results.

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Behaviour Of Reactive Powder Concrete Hollow Core Columns Strengthened With Carbon Fiber Reinforced Polymer Under Eccentric Loading

Cited by 3 publications

References 28 publications

Numerical Investigation on Effect of Opening Ratio on Structural Performance of Reinforced Concrete Deep Beam Reinforced with CFRP Enhancements

Numerical Investigation on Effect of Opening Ratio on Structural Performance of Reinforced Concrete Deep Beam Reinforced with CFRP Enhancements

Study The Behavior of Square Reinforced Concrete Columns Strengthened with CFRP

Study the Behavior of Castellated Steel Column Encasing by Different Reactive Powder Concrete Thickness with Laced Reinforcement

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