A case study of flexural performance of reinforced concrete beams bonded with steel plates with different thickness

Atea, Rafid Saeed

doi:10.1016/j.jmrt.2017.10.006

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The load-deflection plots obtained from numerical study show a good agreement with the experimental plots. Atea (2018) has used the ANSYS program to simulate the bending behavior of four RC beams composed by adding steel plates with different thicknesses.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of CFRP-externally strengthened reinforced concrete beams subjected to three-point bending

Barour

Zergua

Bouziadi

et al. 2019

WJE

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Purpose This paper aims to develop a non-linear finite element model predicting the response of externally strengthened beams under a three-point flexure test. Design/methodology/approach The ANSYS software is used for modeling. SOILD65, LINK180, SHELL181 and SOLID185 elements are used, respectively, to model concrete, steel reinforcement, polymer and steel plate support. A parametric study was carried out. The effects of compressive strength, Young’s modulus, layers number and carbon fiber-reinforced polymer thickness on beam behavior are analyzed. A comparative study between the non-linear finite element and analytical models, including the ACI 440.2 R-08 model, and experimental data is also carried out. Findings A comparative study of the non-linear finite element results with analytical models, including the ACI 440.2 R-08 model and experimental data for different parameters, shows that the strengthened beams possessed better resistance to cracks. In general, the finite element model’s results are in good agreement with the experimental test data. Practical implications This model will predict the strengthened beams behavior and can describe the beams physical conditions, yielding the results that can be interpreted in the structural study context without using a laboratory testing. Originality/value On the basis of the results, a good match is found between the model results and experimental data at all stages of loading the tested samples. Crack models obtained in the non-linear finite element model in the beams are also presented. The submitted finite element model can be used to predict the behavior of the reinforced concrete beam. Also, the comparative study between an analytical model proposed by of current code of ACI 440.2 R-08 and finite element analysis is investigated.

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Section: Introductionmentioning

confidence: 99%

Finite element analysis of CFRP-externally strengthened reinforced concrete beams subjected to three-point bending

Barour

Zergua

Bouziadi

et al. 2019

WJE

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“…The load-deflection charts from the numerical research match well with the experimental outcomes. Atea [45] utilized the ANSYS software to model the flexural performance of four RC-beams made up of varying-thickness steel plates. To provide an efficient link between the concrete element and the steel plates, shear connectors were used.…”

Section: Applications Of Finite Element In the Analysis Of Frp Rc-mem...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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“…The mechanical slipping of the bolts affects the strengthening effect (Li et al, 2016; Nguyen et al, 2001; Shan and Su, 2018; Su and Zhu, 2005). The experimental results showed that the premature debonding of steel plates can be prevented by composite anchorage of adhesive and bolts (Atea, 2019; Gao et al, 2006), while adhesive injection at the interface and bolt holes can reduce the mechanical slipping to some extent. In this way, the joint performance of the steel plates and the RC beams can be distinctly improved, achieving a satisfactory strengthening effect.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on flexural strengthening of reinforced concrete beams with U-shaped steel under secondary load

Lin

Tang

et al. 2021

Advances in Structural Engineering

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This study proposes a new method to strengthen reinforced concrete (RC) beams with U-shaped steel, which can achieve rapid construction and great improvement in the flexural performance of RC beams. To investigate the influence of secondary load defined as newly applied loads after strengthening on the strengthening effect, a total of nine specimens were tested under four-point bending, including a reference beam, a strengthened beam under initial load, and seven strengthened beams under secondary load. The initial loading degree, the thickness of the bottom plate, and the height of the steel box were the main variables considered in this study. Testing results showed that compared with the reference beam, the flexural performance of strengthened beams was significantly enhanced, indicating the good joint performance of the U-shaped steel and the RC beams. Among the three main variables, the initial loading degree was found to have a minimal effect on the flexural performance while the thickness of the bottom plate and the height of the steel box had considerable influence, with the latter having a more pronounced effect. Testing results also showed that most of the strengthened beams experienced flexural failures, which were reflected by steel web peeling and buckling, and concrete crushing. Moreover, a formula was derived for calculating the flexural capacity of strengthened beams under secondary load. The results from the derived formula were found to be in good agreement with those from experiments.

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A case study of flexural performance of reinforced concrete beams bonded with steel plates with different thickness

Cited by 4 publications

References 3 publications

Finite element analysis of CFRP-externally strengthened reinforced concrete beams subjected to three-point bending

Finite element analysis of CFRP-externally strengthened reinforced concrete beams subjected to three-point bending

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

Experimental study on flexural strengthening of reinforced concrete beams with U-shaped steel under secondary load

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