A material-performance-based database for FRC and RC elements under shear loading

Cuenca, Estefanía; Conforti, Antonio; Minelli, Fausto; Plizzari, Giovanni; Navarro‐Gregori, Juan; Serna, Pedro

doi:10.1617/s11527-017-1130-7

Cited by 34 publications

(42 citation statements)

References 32 publications

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“…Comparison between the proposed model and the experiments gave an absolute average error of 11.39% and a coefficient of variation of 15.42%. Other recent research works that have considered databases of experiments have used smaller databases than this study: 122 experiments [11] or 171 experiments (of which 93 with Fiber Reinforced Concrete) [44].…”

Section: Rdmentioning

confidence: 99%

ANN-Based Shear Capacity of Steel Fiber-Reinforced Concrete Beams without Stirrups

Abambres

Lantsoght

2019

Fibers

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Comparing experimental results of the shear capacity of steel fiber-reinforced concrete (SFRC) beams without stirrups to the capacity predicted using current design equations and other available formulations shows that predicting the shear capacity of SFRC beams without mild steel shear reinforcement is still difficult. The reason for this difficulty is the complex mechanics of the problem, where the steel fibers affect the different shear-carrying mechanisms. Since this problem is still not fully understood, we propose the use of artificial intelligence (AI) to derive an expression based on the available experimental data. We used a database of 430 datapoints obtained from the literature. The outcome is an artificial neural network-based expression to predict the shear capacity of SFRC beams without shear reinforcement. For this purpose, many thousands of artificial neural network (ANN) models were generated, based on 475 distinct combinations of 15 typical ANN features. The proposed “optimal” model results in maximum and mean relative errors of 0.0% for the 430 datapoints. The proposed model results in a better prediction (mean Vtest/VANN = 1.00 with a coefficient of variation 1 × 10−15) as compared to the existing code expressions and other available empirical expressions, with the model by Kwak et al. giving a mean value of Vtest/Vpred = 1.01 and a coefficient of variation of 27%. Until mechanics-based models are available for predicting the shear capacity of SFRC beams without shear reinforcement, the proposed model thus offers an attractive solution for estimating the shear capacity of SFRC beams without shear reinforcement. With this approach, designers who may be reluctant to use SFRC because of the large uncertainties and poor predictions of experiments, may feel more confident using the material for structural design.

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Section: Rdmentioning

confidence: 99%

ANN-Based Shear Capacity of Steel Fiber-Reinforced Concrete Beams without Stirrups

Abambres

Lantsoght

2019

Fibers

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“…To evaluate performance of the model the database developed for Foster et al [29] was expanded; additional tests included prestressed concrete members and beams reinforced with crimped (C), and flat end (FH) fibres, as well as high-strength (HS) fibres. A large database in this regards was also recently published in [30], which includes many of the beams considered . The test specimens used in this paper to test the design models are presented in Table 3.…”

Section: Model Assessment and Validationmentioning

confidence: 99%

“…Their study identified 413 SFRC beams reported in the literature as being tested in shear, although many of the tests were limited by their flexural strength. Recent articles have been dedicated to prepare substantive test databases in this subject [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

An integrated approach for predicting the shear capacity of fibre reinforced concrete beams

Barros

Foster

2018

Engineering Structures

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This paper describes the development of an integrated design approach for determining shear capacity of flexurally reinforced steel fibre reinforced concrete members. The approach considers fibre distribution profile, fibre pull-out resistance and the modified compression field theory integrated using a comprehensive strategy. To assess the performance of the developed model, a database consisting of 122 steel fibre reinforced and prestressed concrete beams failing in shear was assembled from available literature. The model predictions were shown to correlate well with the test data. The performance of the analytical model was also compared to predictions attained by the two approaches recommended by the fib Model Code 2010, one based on an empirical equation and the other on the modified compression field theory approach. The predictive performance of the proposed approach was also assessed by using the Demerit Points Classification (DPC), being the prediction as better as lower is the total penalty points provided by the classification. The model developed in this paper demonstrated a superior performance to those of the Model Code, with a higher predictive performance in terms of safety and reliability.

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“…The use of stirrups for shear resistance is a classical solution but relatively expensive because it is laborwork demanding; the use of FRC for shear resistance is one of the most analyzed structural application in research studies (Fig. 6) [34,35]. In fact, FRC enhances the shear resisting mechanisms in the beam.…”

Section: Shear In Linear Elements With Rebars As Bending Reinforcementmentioning

confidence: 99%

Structural effects of FRC creep

Plizzari

Ros

2018

Mater Struct

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Research studies in the last 20 years allowed to obtain reliable rules for designing structures made of fiber reinforced concrete (FRC). However, design aspects like the long-term behavior of FRC, especially when synthetic fibers are adopted, require further research. Long-term behavior includes aging and creep. Aging represent the change of fiber properties into the concrete environment, which may reduce the structural bearing capacity; when present, it is an important issue for the structural safety, especially when fibers are the only reinforcement. Aging of fibers must be proven by experimental tests. Creep is a complex phenomenon, roughly considered by building codes even for traditional reinforced concrete (RC) structures. The introduction of fibers do not change anything in concrete matrix and, before cracking, in the material concrete creep behavior is not expected any change. After cracking, the structural effect of FRC creep depends on the degree of structural redundancy and on the presence of rebars since creep produces a stress redistribution in the structure or from FRC to the rebars. When FRC postcracking resistance is necessary for equilibrium requirements, in structures with cracked sections in service conditions the structural deferred response has to be analyzed by considering the FRC creep behavior. When FRC is used for resisting secondary actions and rebars are present for equilibrium requirements, the response of a FRC element (with rebars and fibers) will be identical to a conventional RC; FRC contributes by controlling the crack development under both short and long term loading.

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A material-performance-based database for FRC and RC elements under shear loading

Cited by 34 publications

References 32 publications

ANN-Based Shear Capacity of Steel Fiber-Reinforced Concrete Beams without Stirrups

ANN-Based Shear Capacity of Steel Fiber-Reinforced Concrete Beams without Stirrups

An integrated approach for predicting the shear capacity of fibre reinforced concrete beams

Structural effects of FRC creep

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