Prediction of Intermediate Crack Debonding Strain of Externally                    Bonded FRP Laminates in RC Beams and One-Way Slabs

Elsanadedy, Hussein M.; Abbas, Husain; Al-Salloum, Yousef; Almusallam, Tarek

doi:10.1061/(asce)cc.1943-5614.0000462

Cited by 42 publications

(30 citation statements)

References 59 publications

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“…e models based on the artificial neural network (ANN) have been detailed in several studies [92][93][94][95][96][97][98][99]. e main idea of ANN models originates from forming a mathematical relation between the dependent and independent variables by training the models using available data [94][95][96]. Sensitivity tests were performed using artificial neural networks (ANN) to assess the relative importance of the variables in the estimation of residual strength of HSC after being exposed to elevated temperature.…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…e network architecture of ANN contains twelve neurons and one hidden layer. e tansig transfer function was employed along with the back propagation (BP) formulation [92][93][94].…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…It is worth mentioning here that ideal distribution of data between testing/validation and training does not exist. However, a review of literature shows that the percentage of data used for training varies from 67% to 90%, and the remaining data are used for validation and testing [89][90][91][92][93][94][95]. In the present study, the training was done using 2/3rd of the data, whereas the validation and testing were performed using the remaining 33% data [92,93].…”

Section: Sensitivity Analysismentioning

confidence: 99%

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Residual Compressive Strength of High-Strength Concrete Exposed to Elevated Temperatures

Elsanadedy

2019

Advances in Materials Science and Engineering

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High-strength concrete (HSC) has several well-known technical, aesthetic, and economic advantages over normal-strength concrete (NSC), which explains the increasing popularity of the former material in the construction domain. As in the case of NSC, however, high temperature adversely affects HSC mechanical properties even more than in NSC, as indicated by the many studies performed so far on HSC at high temperature (hot properties) or past a thermal cycle at high temperature (residual properties). Since many code provisions concerning concrete properties versus high temperature were developed for ordinary concrete and the available models (in terms of stress-strain relationship) come mostly from the tests on NSC—as the tests on HSC are less numerous—developing predictive relationships for HSC exposed to high temperature is still an open issue, especially with reference to many parameters affecting concrete compressive strength, like temperature as such, heating rate, water-to-binder ratio, and strength in compression, to cite the most relevant parameters. To this purpose, a large database (more than 600 tests) is examined in this paper, which is focused on HSC residual properties and on the variables affecting its residual strength. Available design models from various guidelines, standards, codes, and technical reports are tested against the database, and new regression-based models and design formulae are proposed for HSC strength in compression, after the exposure to high temperature.

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Section: Sensitivity Analysismentioning

confidence: 99%

“…e network architecture of ANN contains twelve neurons and one hidden layer. e tansig transfer function was employed along with the back propagation (BP) formulation [92][93][94].…”

Section: Sensitivity Analysismentioning

confidence: 99%

Section: Sensitivity Analysismentioning

confidence: 99%

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Residual Compressive Strength of High-Strength Concrete Exposed to Elevated Temperatures

Elsanadedy

2019

Advances in Materials Science and Engineering

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“…The debonding of the FRP and concrete interface is a common form of bending failure of FRP-strengthened RC beams, which may occur at the end of the FRP plate or at the intermediate crack (IC) (Fu et al, 2017). In the past 20 years, scholars from all over the world have performed much research on the prediction model of the IC debonding failure of FRP-strengthened RC beams (JSCE, 2001;ACI, 2008;Lopez-Gonzalez et al, 2016;Hoque et al, 2017;Li and Wu, 2018), but there is not a generally accepted model (Elsanadedy et al, 2014;Lopez-Gonzalez et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Prediction of the IC debonding failure of FRP-strengthened RC beams based on the cohesive zone model

Zhang

Guo

et al. 2020

Lat. Am. j. solids struct.

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Intermediate crack (IC) debonding failure is one of the common bending failure forms of fiber-reinforced polymer (FRP)-strengthened reinforced concrete (RC) beams. In this paper, a new prediction model for IC debonding in FRP-strengthened RC beams is proposed based on fracture mechanics and cohesive zone model (CZM), which takes into account the coupling effect of many parameters and has the advantages of high precision and simple expression. The nonlinear behavior of FRP-strengthened RC beams and the influence of flexural cracks are reasonably considered in this model, whereas all existing analytical models based on the CZM neglect this effects. To verify the accuracy of this model, we established a database containing 248 test data from the existing literature. By comparing the differences between the predicted and experimental results, we analyzed the causes of the error and established a semiempirical model. To test the reliability of the model, it is evaluated using the database constructed in this paper together with four representative strength models. The results show that the semiempirical model has a high accuracy.

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“…Moreover, increase in the ultimate capacity due to FRP strengthening will not necessarily result in a proportional increase in the service load [1]; therefore, verification of serviceability limit state in FRP strengthened RC elements is crucial. A number of experimental tests have been conducted to evaluate the cracking of FRP strengthened RC flexural elements [11][12][13]. However, the behavior of FRP strengthened RC members under direct tension was the focus of few research studies [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Cracking behavior and crack width predictions of FRP strengthened RC members under tension

Zomorodian

Yang

Belarbi

et al. 2016

Engineering Structures

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link CRACKING BEHAVIOR AND CRACK WIDTH PREDICTIONS OF FRP STRENGTHENED RC MEMBERS UNDER TENSION AbstractThis paper presents and discusses the experimental results of uniaxial tensile tests of fiber reinforced polymer externally strengthened reinforced concrete (FRP strengthened RC) prisms in terms of crack width and crack spacing. As a non-contact and material independent system for in-time measurement of displacement and strain, the digital image correlation (DIC) technique has been used in this study for investigating the evolution of strains and formation of cracks during uniaxial tensile tests. As a result, the cracks were measured precisely at any load stage.The experimental results of tests performed by authors and other researchers on FRP strengthened RC members in tension are compared to prediction models from code provisions and guidelines (Eurocode 2 and fib 14), and their suitability are analyzed and discussed. The results show the dependence of the behavior and crack characteristics of FRP strengthened RC members to parameters such as wrapping scheme and FRP reinforcement ratios which are not included in design provisions for crack analysis. A new formulation for crack width and spacing for FRP strengthened RC members, calibrated using the experimental results, has been proposed which considers all the main affecting parameters.

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Prediction of Intermediate Crack Debonding Strain of Externally Bonded FRP Laminates in RC Beams and One-Way Slabs

Cited by 42 publications

References 59 publications

Residual Compressive Strength of High-Strength Concrete Exposed to Elevated Temperatures

Residual Compressive Strength of High-Strength Concrete Exposed to Elevated Temperatures

Prediction of the IC debonding failure of FRP-strengthened RC beams based on the cohesive zone model

Cracking behavior and crack width predictions of FRP strengthened RC members under tension

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