Carbon fiber-reinforced polymer mesh fabric as shear reinforcement in reinforced concrete beams

Li, WeiWen; Tang, Shiying; Huang, Xiaoguang; Liu, Wei; Xu, Yang; Shi, Tiansheng

doi:10.1016/j.jobe.2022.104433

Cited by 7 publications

(3 citation statements)

References 37 publications

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“…Fiber reinforced polymer (FPR) composites have been increasingly used in reinforcing concrete beams for flexural or shear strengthening 1 , 2 . These composites were used as a substitute of steel bars for reinforcing concrete structures in corrosive environment.…”

Section: Introductionmentioning

confidence: 99%

Machine learning models development for shear strength prediction of reinforced concrete beam: a comparative study

Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

2023

Sci Rep

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Fiber reinforced polymer (FPR) bars have been widely used as a substitutional material of steel reinforcement in reinforced concrete elements in corrosion areas. Shear resistance of FRP reinforced concrete element can be affected by concrete properties and transverse FRP stirrups. Hence, studying the shear strength (Vs) mechanism is one of the highly essential for pre-design procedure for reinforced concrete elements. This research examines the ability of three machine learning (ML) models called M5-Tree (M5), extreme learning machine (ELM), and random forest (RF) in predicting Vs of 112 shear tests of FRP reinforced concrete beam with transverse reinforcement. For generating the prediction matrix of the developed ML models, statistical correlation analysis was conducted to generate the suitable inputs models for Vs prediction. Statistical evaluation and graphical approaches were used to evaluate the efficiency of the proposed models. The results revealed that all the proposed models performed in general well for all the input combinations. However, ELM-M1 and M5-Tree-M5 models exhibited less accuracy performance in comparison with the other developed models. The study showed that the best prediction performance was revealed by M5 tree model using nine input parameters, with coefficient of determination (R2) and root mean square error (RMSE) equal to 0.9313 and 35.5083 KN, respectively. The comparison results also indicated that ELM and RF were performed significant results with a less slight performance than M5 model. The study outcome contributes to basic knowledge of investigating the impact of stirrups on Vs of FRP reinforced concrete beam with the potential of applying different computer aid models.

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Section: Introductionmentioning

confidence: 99%

Machine learning models development for shear strength prediction of reinforced concrete beam: a comparative study

Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

2023

Sci Rep

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“…Recently, many studies have been carried out on the shear strengthening of corroded RC beams. The common shear strengthening methods include bonded fiber‐reinforced polymer (FRP) strips or mesh fabric, 10–12 bonded steel plates, 13 anchored steel plates, and U‐shaped stirrups 14 . The FRP strengthening provides a novel solution for improving the ultimate strength of corroded beams 15–17 .…”

Section: Introductionmentioning

confidence: 99%

Shear performance of stirrup corroded RC beams: Effects of strengthening interventions and corrosion rates

Liang

Zhou

et al. 2023

Structural Concrete

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This paper investigates the shear performance of corroded reinforced concrete (RC) beams with different stirrup corrosion rates and strengthening interventions. In this work, eight corroded beams strengthened with various interventions, including U-shaped stirrup, bonded steel plate, and anchored steel plate strengthening techniques, were tested under static loading. The experimental shear capacity, load-deflection response, and failure modes of the unstrengthened and strengthened specimens were carefully studied. Three shear capacity models based on GB50010-2010, ACI 318-08, and Eurocode 2 codes were proposed and discussed. The results showed that all specimens have the same failure mode, that is, the shear-compression failure. The shear capacities are improved by 17.36%-23.61% and 23.76%-38.46% by these interventions for the specimens with 10% and 20% stirrup corrosion rates, respectively. The anchored steel plate technique provides the maximum improvement in the shear capacity. Additionally, the increased stiffness of corroded specimens with strengthening interventions is apparent when the corrosion rate is 10% but not obvious when the corrosion rate is 20%. The models based on GB50010-2010 and ACI 318-08 codes were proved to have higher accuracy but may overestimate the shear capacity. In contrast, the Eurocode 2-based model comes with relatively low prediction accuracy but conservative results, and it is recommended for engineering design.

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“…Several studies [22][23][24][25][26][27][28] investigated the impact of shear stirrups on RC-beams strengthened utilizing various FRP strip configurations. In comparison to the referenced beam, the laminated beams have a larger overall flexural strength and significantly improved ductility.…”

Section: Introduction 1behaviour Of Strengthened Rc Beams Using Exter...mentioning

confidence: 99%

Unbonded Pre-Tensioned CF-Laminates Mechanically Anchored to HSC Beams as a Sustainable Repair Solution for Detachment of Bonded CF-Laminates

El Zareef,

Barour,

Kaloop

et al. 2023

Buildings

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The present article outlines a Finite Element Model (FEM) that was created and validated by comparing it to prior experimental investigations to estimate the flexural performance of HSC beams strengthened with exterior bonded, unbonded, and unbonded pre-tensioned Carbon Fibre Reinforced Polymer (CFRP) sheets in several patterns. Nonlinear analysis was performed on three-point-loaded beams using ANSYS software, incorporating the constitutive characteristics of various components (concrete, CFRP, and steel). The comparison of FE-models and experimental data, namely for load-deflection curves, crack patterns, and failure modes, revealed that the developed numerical FE-models and experimental outcomes are in good accord. There has been numerous prior research on the behavior of beams strengthened with externally bonded CFRP sheets, but few on those reinforced with externally unbonded CFRP laminates, and even fewer on HSC beams reinforced with externally unbonded pre-tensioned CFRP laminates. Therefore, the major contribution of this article is to investigate the flexural behavior of HSC beams strengthened utilizing externally unbonded pre-tensioned CFRP laminates. The analysis revealed that the bending performance of RC-beams strengthened using external unbonded pre-tensioned CFRP-laminates is quite similar to that of bonded CFRP-strengthened beams, indicating a high potential for tackling the durability issues caused by detachment of bonded CFRP-strips in such structural elements. The existence of a fully wrapped CF sheet forced the beam to develop diagonal shear cracks in the region between the wrapped CF sheet and beam supports while also enhancing the flexural cracked zone at mid-span to change from smeared to discrete fractures. The flexural fractures spread over a deeper and wider area of the beam as a result of the incorporation of a half-wrap CF laminate. Externally unbonded CFRP-sheets pre-tensioned with 45% of the CFRP ultimate strength utilizing various patterns (straight and U-wrap) performed similarly to bonded CFRP-sheets, with a slight boost in load capacity of around 4.5% and notable reduces in deflection ranging from 9.7% to 16.24%. Using exterior unbonded CFRP laminates to strengthen RC-beams resulted in a flexural capacity increase ranging from 22.3% for NC beams to 71.6% for HSC beams.

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Carbon fiber-reinforced polymer mesh fabric as shear reinforcement in reinforced concrete beams

Cited by 7 publications

References 37 publications

Machine learning models development for shear strength prediction of reinforced concrete beam: a comparative study

Machine learning models development for shear strength prediction of reinforced concrete beam: a comparative study

Shear performance of stirrup corroded RC beams: Effects of strengthening interventions and corrosion rates

Unbonded Pre-Tensioned CF-Laminates Mechanically Anchored to HSC Beams as a Sustainable Repair Solution for Detachment of Bonded CF-Laminates

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