Influence of Tension Stiffening on the Flexural Stiffness of Reinforced Concrete Circular Sections

Morelli, Francesco; Amico, Cosimo; Salvatore, Walter; Squeglia, Nunziante; Stacul, Stefano

doi:10.3390/ma10060669

Cited by 17 publications

(6 citation statements)

References 20 publications

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“…When a crack begins to widen, it comes into contact with a number of fibers that are either perpendicular to it or positioned at an angle and resist its widening. Fibers act as crack arrestors and transmit tensile stresses through the cracks [10][11][12][13][14][15]. The gradual activation of the fibers results in the transformation of the overall behavior of the concrete from brittle to pseudo-ductile, enhance the energy dissipation capacity and reduce the width Materials 2021, 14, 3889 2 of 24 of the cracks [16,17].…”

Section: Post-cracking Behavior Of Steel Fiber Reinforced Concrete (Sfrc)mentioning

confidence: 99%

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Multivariable Regression Strength Model for Steel Fiber-Reinforced Concrete Beams under Torsion

2021

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Torsional behavior and an analysis of steel fiber reinforced concrete (SFRC) beams are investigated in this paper. The purpose of this study is twofold: to examine the torsion strength models for SFRC beams available in the literature and to address properly verified design formulations for SFRC beams under torsion. A total of 210 SFRC beams tested under torsion from 16 different experimental investigations around the world are compiled. The few strength models available from the literature are adapted herein and are used to calculate the torsional strength of the beams. The predicted strength is compared with the experimental values measured by the performed torsional tests and these comparisons showed room for improvement. First, a proposed model is based on optimizing the constants of the existing formulations using multi-linear regression. Furthermore, a second model is proposed, which is based on modifying the American Concrete Institute (ACI) design code for reinforced concrete (RC) members to include the effect of steel fibers on the torsional capacity of SFRC beams. Applications of the proposed models showed better compliance and consistency with the experimental results compared to the available design models, providing safe and verified predictions. Furthermore, the second model implements the ACI code for RC using a simple and easy-to-apply formulation.

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Section: Post-cracking Behavior Of Steel Fiber Reinforced Concrete (Sfrc)mentioning

confidence: 99%

“…Standard deviation number of samples (11) Such technique was applied in many previous investigations [85][86][87][88]. It is worth noting that applying the principles of reliability is out of scope of this study, it is worthy of future study [89].…”

Section: Effectiveness Evaluation Of Existing Modelsmentioning

confidence: 99%

Multivariable Regression Strength Model for Steel Fiber-Reinforced Concrete Beams under Torsion

2021

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“…Therefore, the seismic isolation strategy, if applicable, results particularly convenient with respect to the classical one of locally strengthening the structural elements. In this case, in fact, the elements strength is being increased instead of reducing the seismic action, through local interventions also suggested by the observation of the typical response mechanisms occurred in the last seismic events (De Matteis et al, 2005;Formisano et al, 2006Formisano et al, , 2016D'Amato et al, 2017;Laterza et al, 2017a,b;Morelli et al, 2017;Caprili et al, 2018;Fuentes et al, 2019a,b;Ramírez et al, 2019). Seismic isolation may result convenient if compared with the design strategy considering dissipative bracing systems, where an increase of stiffness and strength through additional elements is provided to the structure (Ciampi et al, 1995;Mazza and Vulcano, 2014;Formisano et al, 2016Formisano et al, , 2017Laguardia et al, 2017;Braga et al, 2019;Panzera et al, 2020).…”

Section: Introductionmentioning

confidence: 96%

Seismic Retrofit of an Existing RC Building With Isolation Devices Applied at Base

D’Amato

Laguardia

Gigliotti

2020

Front. Built Environ.

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Nowadays, seismic retrofit through isolation strategy represents a consolidated technique of protection against design earthquakes. This technique is also applied on existing structures extensively, due to the fact that it usually does not require any interruption of the building use and occupants evacuation. If applicable, it rapidly allows the seismically retrofitting of a building installed with seismic devices with low horizontal stiffness between the structure and the foundation decoupling, in fact, this allows the motion of the superstructure from the ground one. In this paper an application on an existing RC building of the seismic isolation is presented. The chosen building was built in the '90s only for vertical loads and realized without any detailing rule for structural ductility. The seismic retrofitting requirement stems from the fact that only recently, after the National seismic hazard maps update in 2003, the considered area has been upgraded to a medium-low seismic intensity zone, while at construction time no seismic classification was in existence by law. The case study peculiarity is that the seismic retrofitting has required an addition to seismic devices at the base, with related interventions such as the application of a bracing system consisting of two elastic steel frames. This intervention is required for stiffening the superstructure and, therefore, minimizing the higher vibration modes effects. The paper presents the main results obtained with a FEM model, implemented for simulating the initial and the design state when the interventions are considered. Finally, some results of non-linear dynamic time-history analyses are illustrated and commented for verifying superstructure elements and seismic devices.

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“…In FRC, short fibers (typically steel) have been used to reinforce plain concrete. Discrete short fibers mainly provide crack control due to their ability to transfer tensile stresses across crack surfaces known as crack-bridging [ 32 ]. Therefore, FRC members demonstrate a pseudo-ductile response, increased residual strength, especially in tension and flexure, and enhanced energy dissipation capacities relative to the brittle behavior of plain concrete.…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of a Novel Textile-Reinforced Polymer Concrete

et al. 2022

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Textile reinforced concrete (TRC) has gained attention from the construction industry due to its light weight, high tensile strength, design flexibility, corrosion resistance, and remarkably long service life. Some structural applications that utilize TRC components include precast panels, structural repair, waterproofing elements, and façades. TRC is produced by incorporating textile fabrics into thin cementitious concrete panels. Premature debonding between the textile fabric and concrete due to improper cementitious matrix impregnation of the fibers was identified as a failure-governing mechanism. To overcome this performance limitation, in this study, a novel type of TRC is proposed by replacing the cement binder with a polymer resin to produce textile reinforced polymer concrete (TRPC). The new TRPC is created using a fine-graded aggregate, methyl methacrylate polymer resin, and basalt fiber textile fabric. Four different specimen configurations were manufactured by embedding 0, 1, 2, and 3 textile layers in concrete. Flexural performance was analyzed and compared with reference TRC specimens with similar compressive strength and reinforcement configurations. Furthermore, the crack pattern intensity was determined using an image processing technique to quantify the ductility of TRPC compared with conventional TRC. The new TRPC improved the moment capacity compared with TRC by 51%, 58%, 59%, and 158%, the deflection at peak load by 858%, 857%, 3264%, and 3803%, and the toughness by 1909%, 3844%, 2781%, and 4355% for 0, 1, 2, and 3 textile layers, respectively. TRPC showed significantly improved flexural capacity, superior ductility, and substantial plasticity compared with TRC.

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Influence of Tension Stiffening on the Flexural Stiffness of Reinforced Concrete Circular Sections

Cited by 17 publications

References 20 publications

Multivariable Regression Strength Model for Steel Fiber-Reinforced Concrete Beams under Torsion

Multivariable Regression Strength Model for Steel Fiber-Reinforced Concrete Beams under Torsion

Seismic Retrofit of an Existing RC Building With Isolation Devices Applied at Base

Flexural Behavior of a Novel Textile-Reinforced Polymer Concrete

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