Mechanical model for the shear strength of steel fiber reinforced concrete (SFRC) beams without stirrups

Bernat, Antonio Marí; Spinella, Nino; Recupero, Antonino; Cladera, A.

doi:10.1617/s11527-020-01461-4

Cited by 40 publications

(28 citation statements)

References 31 publications

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“…The statistical characterisation of model uncertainties and the assessment of its consistency over the range of design situations are critical objectives, as they have a significant impact on reliability performance. The evaluation is done for three shear predictive models, namely the best estimate (mean value) model of (1) f ib Model Code 2010 [20], (2) German guideline (DAfStB) [19], and (3) Bernat et al [27] mechanical model. A summary of the predictive models, together with the assumptions made, are presented in Section 3.1.…”

Section: Objectives Of the Investigationmentioning

confidence: 99%

“…The proposed model for estimating the mean shear strength of SFRC beam without stirrups, according to Bernat et al [27], is expressed as Equation 5.…”

Section: Bernat Et Al [27] Mechanical Modelmentioning

confidence: 99%

“…A summary of most of the proposed shear design models for SFRC beams without stirrups in current literature and design guidelines can be found in [21]. Majority of the existing shear design formulations are either empirical or semi-empirical based, except for the models based on the Modified Compression Field Theory (MCFT) [22,23], the Dual Potential Capacity Model [24], plasticity-based models [25,26] and the modified Multi-Action Shear Model [27]. The comparison of the various SFRC shear resistance models, as presented in [21,27], indicate the difficulty and complexity of the accurate prediction of shear capacity of SFRC beams.…”

Section: Introductionmentioning

confidence: 99%

“…However, there is a lack of assessment of the consistency of these uncertainties over the range of design situations. Also, the recent developments and studies regarding the shear behaviour of SFRC beams resulted in the development of new and improved analytical formulations [27] and a new database of SFRC beams failing in shear [21]. In view of these developments, detailed treatment and quantification of model uncertainty, including the investigation of its consistency over design ranges are needed.…”

Section: Introductionmentioning

confidence: 99%

“…The model uncertainty data can be used for the derivation of suitable global partial safety factors accounting for the systematic effect of model uncertainty. [27] Mean is obtained as the average of the ratio of experimental to predicted shear resistance obtained for each specimen. SD denotes the standard deviation.…”

Section: Introductionmentioning

confidence: 99%

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Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures

Olalusi

Spyridis

2020

Applied Sciences

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Shear failure is a brittle and undesirable mode of failure in reinforced concrete structures. Many of the existing shear design equations for steel fiber reinforced concrete (SFRC) beams include significant uncertainty due to the failure in accurately predicting the true shear capacity. Given these, adequate quantification and description of model uncertainties considering the systematic variation in the model prediction and measured shear capacity is crucial for reliability-based investigation. Reliability analysis must account for model uncertainties in order to predict the probability of failure under prescribed limit states. This study focuses on the quantification and description of model uncertainty related to the current shear resistance predictive models for SFRC beams without shear reinforcement. The German (DAfStB) model displayed the lowest bias and dispersion, whereas the fib Model 2010 and the Bernat et al., model displayed the highest bias and dispersion. The inconsistencies observed in the resistance model uncertainties at the variation of shear span to effective depth ratio are a major cause for concern, and differentiation with respect to this parameter is advised. Finally, in line with the EN 1990 semi-probabilistic approach for reliability-based design, the global partial safety factors related to model uncertainties in the shear resistance prediction of SFRC beams are proposed.

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Section: Objectives Of the Investigationmentioning

confidence: 99%

“…The proposed model for estimating the mean shear strength of SFRC beam without stirrups, according to Bernat et al [27], is expressed as Equation 5.…”

Section: Bernat Et Al [27] Mechanical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures

Olalusi

Spyridis

2020

Applied Sciences

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Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Frontera

Cladera

2022

Structural Concrete

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Corrosion of stirrups (generally with small diameters and concrete covers) significantly affects the shear strength of reinforced concrete elements. As shear failures may lead to brittle collapses, hence the need to avoid them during structures' entire service life. The Compression Chord Capacity Model (CCCM), a shear mechanical model, was recently extended to predict the strength of corrosion-damaged beams by identifying the model parameters that could be most affected by steel corrosion. In this paper, the CCCM is combined with two material deterioration models included in the new Spanish Structural Code, and considers carbonation of concrete or chloride ions, to predict long-term shear strength evolution. Finally, a parametric analysis is carried out to explore the effect of the most influential parameters on shear strength degradation according to the used models and depending on different exposure classes.

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Nonlinear analysis of flat slab‐column connections to optimize the use of HPFRC under monotonic vertical loading

Díaz

Isufi

Trautwein

et al. 2022

Structural Concrete

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Numerous studies have shown that incorporating fibers in concrete can improve its mechanical properties, including tensile strength and toughness. Due to these outstanding properties, the use of fiber‐reinforced concrete (FRC) composites has been investigated for applications in structural members subjected to shear, in which brittle failure mode may occur. An example of this type of application is the use of high/ultrahigh‐performance fiber‐reinforced concrete (HPFRC/UHPFRC) in flat slab‐column connections as an alternative to shear reinforcement. The experimental results revealed that the use of advanced concrete materials led to an increase in the punching shear and deformation capacities. Despite these advantages, the use of HPFRC/UHPFRC in practical design is somehow limited by the lack of guidelines in codes for this type of new material. Furthermore, the study of constitutive models for nonlinear finite element analysis is also necessary. In this regard, this article addresses the simulation of two‐way slabs with HPFRC, subjected to concentrated monotonic vertical loading, tested in a previous experimental study, where the HPFRC was used only in a limited slab region around the column, and the rest of the slab was cast with normal strength concrete. The numerical models were developed in the commercial finite element software DIANA. The concrete nonlinear behavior was modeled by a total strain‐based constitutive model, in which the HPFRC softening is represented by a tensile stress‐crack width (σ − w) relationship. The validity of the numerical model is checked by the comparison with the experimental results and a punching shear mechanical model, leading to the formulation of a closed‐form equation. Finally, a parametric study was conducted to extrapolate the results obtained in the experimental campaign and to optimize the use of HPFRC to obtain a more economical and sustainable solution.

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Mechanical model for the shear strength of steel fiber reinforced concrete (SFRC) beams without stirrups

Cited by 40 publications

References 31 publications

Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures

Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures

Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Nonlinear analysis of flat slab‐column connections to optimize the use of HPFRC under monotonic vertical loading

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