New modifying truss model and numerical simulation of steel fiber reinforced concrete under pure torsion

Hui, Lei; Almansa, Francisco López

doi:10.1016/j.istruc.2018.02.001

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…The addition of steel fibers to concrete can significantly improve its resistance to shear failure. According to several sources [14][15][16][17], the inclusion of fibers in concrete can greatly enhance its behavior after cracking and modify its tensile strength. The addition of steel fibers has been found to significantly affect various properties of concrete members, such as resistance to deformation and cracking, as well as ultimate flexural strength, ductility, toughness, and shear capacity [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Shear Strength Prediction of Steel-Fiber-Reinforced Concrete Beams Using the M5P Model

Al-Abdaly

Hussein

Imran³

et al. 2023

Fibers

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This article presents a mathematical model developed using the M5P tree to predict the shear strength of steel-fiber-reinforced concrete (SFRC) for slender beams using soft computing techniques. This method is becoming increasingly popular for addressing complex technical problems. Other approaches, such as semi-empirical equations, can show known inaccuracies, and some soft computing methods may not produce predictive equations. The model was trained and tested using 332 samples from an experimental database found in the previous literature, and it takes into account independent variables such as the effective depth d, beam width bw, longitudinal reinforcement ratio ρ, concrete compressive strength fc, shear span to effective depth ratio a/d, and steel fiber factor Fsf. The predictive performance of the proposed M5P-based model was also compared with the one of existing models proposed in the previous literature. The evaluation revealed that the M5P-based model provided a more consistent and accurate prediction of the actual strength compared to the existing models, achieving an R2 value of 0.969 and an RMSE value of 37.307 for the testing dataset. It was found to be a reliable and also straightforward model. The proposed model is likely to be highly helpful in assessing the shear capacity of SFRC beams during the pre-planning and pre-design stages and could also be useful to help for future revisions of design standards.

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Section: Introductionmentioning

confidence: 99%

Shear Strength Prediction of Steel-Fiber-Reinforced Concrete Beams Using the M5P Model

Al-Abdaly

Hussein

Imran³

et al. 2023

Fibers

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“…Hui and Lopez [ 65 ] developed a model suitable for constant section members that was based on previous formulations using average linear interpolation methods and they implemented it in finite element analysis software.…”

Section: Introductionmentioning

confidence: 99%

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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Enhancing torsional performance of reinforced concrete beams: a comparative analysis of shear reinforcement strategies

Mahzuz,

Nury,

Ahmed

et al. 2024

Discov Civ Eng

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Torsion failure poses a critical threat to the structural integrity of reinforced concrete, particularly in seismic hazard zones. This study aims to overcome this difficulty by conducting a thorough examination of the torsional characteristics of Reinforced Cement Concrete (RCC) beams. This study examined the torsional characteristics of various RCC beams by utilizing different configurations of shear reinforcements. The objective was to determine an effective alternative shear reinforcement configuration in comparison to the traditional Non-welded Rectangular Stirrup Beam (NRSB). Comparing three types of beams, namely NRSB, Welded Rectangular Stirrup Beam (WRSB), and Welded Warren Truss Beam (WWTB), a novel warren truss-shaped shear reinforcement was introduced. All beams were constructed with consistent dimensions of concrete and uniform weights of reinforcement, including 16 mm bars for the top and bottom longitudinal reinforcement and 10 mm bars as shear reinforcements. Two separate concrete mix ratios were evaluated, specifically 1:1.5:1.5 and 1:2.5:2.5 (by volume) respectively. Theoretical calculations based on elastic theory were used to determine the angle of twist for each beam. The torsional moment resistance of WRSB and WWTB was found to be 4.4% and 1% higher, respectively, compared to the traditional NRSB, while using a mix ratio of 1:1.5:1.5. Regarding the alternative mixture ratio, the torsional moment for WRSB was 10% more, whereas for WWTB it was 2.4% less. As a result, the WRSB specimens exhibited the highest torsional moment for both mix ratios, but the NRSB and WWTB specimens had comparable values.

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New modifying truss model and numerical simulation of steel fiber reinforced concrete under pure torsion

Cited by 5 publications

References 13 publications

Shear Strength Prediction of Steel-Fiber-Reinforced Concrete Beams Using the M5P Model

Shear Strength Prediction of Steel-Fiber-Reinforced Concrete Beams Using the M5P Model

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

Enhancing torsional performance of reinforced concrete beams: a comparative analysis of shear reinforcement strategies

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