Simple and effective models to predict the compressive and tensile strength of HPFRC as the steel fiber content and type changes

Savino, V.; Lanzoni, Luca; Tarantino, Angelo Marcello; Viviani, M.

doi:10.1016/j.compositesb.2017.11.003

Cited by 50 publications

(39 citation statements)

References 34 publications

(30 reference statements)

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“…e test results also showed that the splitting tensile strength increases with the increase in fiber content, which is frequent in the literature [41][42][43][44]. e increase in splitting tensile strength can easily be attributed to the fiber bridging potential of tensile cracks.…”

Section: Results Of Control Testsmentioning

confidence: 56%

Experimental Investigation on the Effect of Steel Fibers on the Flexural Behavior and Ductility of High‐Strength Concrete Hollow Beams

Abbass

Abid

Özakça

2019

Advances in Civil Engineering

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In this study, an experimental work was directed toward comparing the flexural behavior of solid and hollow steel fiber-reinforced concrete beams. For this purpose, eight square cross-sectional beam specimens, four solid and four hollow, were prepared. One concrete mixture with four different steel fiber contents of 0, 0.5, 1.0, and 1.5% were used. The side length of the central square hole was 80 mm, whereas the cross-sectional side length was 150 mm. All beams were tested under four-point monotonic loading until failure. In addition to the solid and hollow beams, cylinders were cast to evaluate the compressive strength, splitting tensile strength, and modulus of elasticity, whereas prisms were used to conduct the fracture test. The test results showed that all fibrous beams failed in flexure, whereas those without fiber exhibited flexural-shear failure. In general, the flexural behavior of fibrous-beams was superior to that of beams without fiber. The hollow beams with fiber contents of 0, 0.5, and 1.0% were observed to withstand lower loads at cracking, yielding, and peak stages compared with their corresponding solid beams; this was not the case for the 1.5% fiber hollow beam, which exhibited a higher peak load than its corresponding solid beam. Although all eight beams exhibited ductility indices higher than 3.7, hollow beams exhibited better ductility than solid beams, showing higher ductility index values.

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Section: Results Of Control Testsmentioning

confidence: 56%

Experimental Investigation on the Effect of Steel Fibers on the Flexural Behavior and Ductility of High‐Strength Concrete Hollow Beams

Abbass

Abid

Özakça

2019

Advances in Civil Engineering

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“…The repairing consisted in the restoration of the damaged portion of the longitudinal steel reinforcement by means of turned rebar parts and substitution of the stirrups and the damaged concrete parts with HPFRC (High Performance Fiber Reinforced Concrete). A detailed description of the repairing process can be found in (Albanesi, Lavorato, Nuti, & Santini, 2009;Lavorato, Nuti, Santini, Briseghella, & Xue, 2015;Savino, Lanzoni, Tarantino, & Viviani, 2018). The cyclic test, which was carried out firstly on the pier P16-1B and consequently on the pier R16-1B, consisted in the imposition of a displacement history at the top of the pier.…”

Section: Experimental Testmentioning

confidence: 99%

A degrading Bouc–Wen model for the hysteresis of reinforced concrete structural elements

Pelliciari

Briseghella

Tondolo

et al. 2019

Structure and Infrastructure Engineering

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This paper presents a smooth hysteresis model for reinforced concrete structural elements based on the differential equation of the Bouc-Wen model. Stiffness degradation and strength degradation are defined by introducing a damage index that includes both dissipated energy and maximum displacement. The pinching effect acts directly on the stiffness of the system and is controlled by an activation energy. The degrading functions are connected to the actual processes with which the damage occurs, thereby giving each parameter a physical meaning. The simple formulation of the model allows a straightforward identification of the best fitting parameters and an easy interpretation of the results. Applications to the cyclic behaviour of reinforced concrete structural elements demonstrate that the model is well capable of describing complex hysteretic behaviours involving degradation and pinching effects.

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“…[33,39,45]. The work of [35] focused both to predict the tensile strength by uniaxial tests, being more realistic than splitting tests, and to improve the reliability of previous models extending the investigation towards more types of fibers and dosages. Despite the good results, its application was limited to the fact that only one type of matrix was investigated, confirming its reliability only for concretes with the same strength range (HPFRC).…”

Section: Introductionmentioning

confidence: 99%

“…Despite the good results, its application was limited to the fact that only one type of matrix was investigated, confirming its reliability only for concretes with the same strength range (HPFRC). The present work aims at extending the model proposed in [35] in order to predict the compressive and the uniaxial tensile strengths for any HPFRC/UHPFRC as matrix and fiber properties change.…”

Section: Introductionmentioning

confidence: 99%

An extended model to predict the compressive, tensile and flexural strengths of HPFRCs and UHPFRCs: Definition and experimental validation

Savino

Lanzoni

Tarantino

et al. 2019

Composites Part B: Engineering

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High manufacturing costs of UHPFRC and expensive and time-consuming tests performed to understand the mechanical response under loading restrict still its wider applications in the field of the structural engineering. Predictive models can be useful to reduce the number of requested tests and to optimize the amount of compounds of the mixture, for example detecting the minimal dosage of fibers necessary to attain a given tensile strength and toughness as well. Currently, not many predictive models do exist and one of the most recent, developed in order to estimate the compressive and tensile responses of HPFRCs, was not notably suitable for UHPFRCs. The main purpose of this work concerns the extension of such a model, in order to predict the mechanical response (in flexion as well) of a given HPFRC/UHPFRC for any change of matrix and fiber properties. Theoretical results were compared with experimental data, thus confirming some shortcomings of the previous model. Once the matrix and fiber properties of a marked UHPFRC were selected, the extended model was used to predict the tensile and flexural bending responses of a full scale UHPFRC structural beam, showing good agreement with the experimental results.

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Simple and effective models to predict the compressive and tensile strength of HPFRC as the steel fiber content and type changes

Cited by 50 publications

References 34 publications

Experimental Investigation on the Effect of Steel Fibers on the Flexural Behavior and Ductility of High‐Strength Concrete Hollow Beams

Experimental Investigation on the Effect of Steel Fibers on the Flexural Behavior and Ductility of High‐Strength Concrete Hollow Beams

A degrading Bouc–Wen model for the hysteresis of reinforced concrete structural elements

An extended model to predict the compressive, tensile and flexural strengths of HPFRCs and UHPFRCs: Definition and experimental validation

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