Experimental and Analytical Study of Ultrahigh-Performance Fiber-Reinforced Concrete Curved Beams

Xie, Tianyu; Ali, M.S. Mohamed; Elchalakani, Mohamed; David, M.

doi:10.1061/(asce)st.1943-541x.0002502

Cited by 18 publications

(6 citation statements)

References 29 publications

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“…Xie et al [33] conducted experimental and theoretical investigations on curved FRC beams subjected to concentrated loads. Moreover, Mohammed et al [34] suggested that the torsional performance could be enhanced by applying a thin layer of FRC to conventional concrete members.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Effect of Varying Fiber Dosages as Stirrup Substitutes in Torsion-Loaded Concrete Beams

et al. 2023

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Over the past few decades, numerous studies have explored the use of steel fiber (SF) as an alternative to transverse reinforcement rebars in reinforced concrete beams, either partially or completely replacing them. However, there are limited studies that have investigated the effect of fiber dosage and length on reinforced concrete beam performance under torsional loads without the use of transverse reinforcement rebars. In this study, experimental investigations were conducted to examine the performance of reinforced SF concrete beams subjected to torsional load, utilizing SFs as a complete substitution of transverse reinforcement rebars. Ten different concrete mixes with varying dosages of SFs, namely 0%, 0.5%, 1.0%, and 1.5%, were examined while maintaining the same aspect ratio for fiber length and diameter. The results revealed that the addition of SFs in the concrete mix had an impact on its properties, reducing workability but increasing flexural, tensile, and compressive strengths. By incorporating 1.0% of SFs in the concrete mix, the missing torsional strength resulting from the absence of stirrups was adequately compensated. Moreover, the presence of SFs significantly influenced the ductile behavior beyond the point of cracking in the tested beams. Hence, it is recommended that SFs are incorporated with dosages of 1.0% and 1.5% in the concrete mixture, particularly for beams subjected to torsion, as a viable substitute for stirrups.

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Section: Introductionmentioning

confidence: 99%

Exploring the Effect of Varying Fiber Dosages as Stirrup Substitutes in Torsion-Loaded Concrete Beams

et al. 2023

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“…Thus, the previous research framework has neglected an important factor-the change in windinduced vibration characteristics of cable-stayed bridges before, during, and after cable breakage. Furthermore, the bridge curvature [16] and the asymmetric arrangement of cables are CBUSBs' significant structural characteristics [17,18]. The influence of these two factors on the wind-induced vibration characteristics of cable-stayed bridges under a break action has not been focused on in the existing studies.…”

Section: Introductionmentioning

confidence: 99%

Study the Influence of Cable Breakage on Wind-Induced Vibration Characteristics of the Curved Beam Unilateral Stayed Bridge

et al. 2023

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Existing studies have found that curved beam unilateral stayed bridges (CBUSB) have a risk of cable breakage under the design wind velocity. To ensure structural wind-induced vibration security, it is necessary to study the wind-induced vibration characteristics of CBUSBs considering the influence of the impact load due to the cable breakage. Based on the aerodynamic coefficients determined by a wind tunnel test and the established impact load model, parametric analyses of important CBUSBs’ characteristics (beam curvature and cable arrangement scheme) and the location of the cable breakage are carried out to assess the influence of cable breakage on the time-domain statistical values and frequency-domain distribution characteristics of wind-induced vibration response. The DAF, considering the influence of cable breakages on the wind-induced vibration peak value of CBUSBs, is proposed through dynamic analysis. Study results show that, with increasing curvature, under the two-modes action of wind loads and impact loads, the fluctuation component of the CBUSB is changed, resulting in a smaller proportion of resonant response. For CBUSBs with unilateral or bilateral cable arrangements, their wind-induced vibration behavior is significantly different. The former have dynamic characteristics and the latter have quasi-static characteristics. The breakage of the shortest cable at 7/33 to 7/22 of the curved beam length and its symmetry part significantly increases the wind-induced peak response of CBUSBs. The DAF recommended values can consider the amplification effect of wind-induced vibration due to the cable breakage.

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“…However, windinduced vibration response is also a concern for stayed bridges in the design and operation stages, and model wind tunnel testing and numerical simulation are effective methods for studying the wind-induced vibration characteristics of structures [1,2]. The change in the curvature of the bridge line shape can produce a series of effects, such as impacts on seismic response [3], impacts on the natural frequency of bending-torsion coupling structure [4], and impacts on the vibration failure mechanism [5]. Similarly, the change in curvature has a negligible effect on the wind-induced vibration of the curved beam bridges.…”

Section: Introductionmentioning

confidence: 99%

Sectional Model Wind Tunnel Test and Research on Wind-Induced Vibration Response of Curved Beam Unilateral Stayed Bridge

Zhao

2022

Advances in Transdisciplinary Engineering

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Sectional model wind tunnel tests and numerical simulation are general methods for studying a curved beam unilateral stayed bridge (CBUSB) to clarify the influence law of the bridge curve linear distribution on wind-induced vibration characteristics of stayed bridges. Aerodynamic force and wind-induced displacement responses are obtained using aerodynamic force and sectional model vibration tests, respectively. Based on experimental results, the finite element model is used to analyze effects of five curvature parameters on the displacement, acceleration, and cable tension of CBUSB. Results show that the displacement and acceleration of wind-induced vibration are restrained as the curvature increases, and the high-order modal vibration of the bridge is stimulated, which shows that the high-frequency vibration reduction should be considered for pedestrian comfort control at high wind speed, and a broadband vibration reduction method can be used.

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Experimental and Analytical Study of Ultrahigh-Performance Fiber-Reinforced Concrete Curved Beams

Cited by 18 publications

References 29 publications

Exploring the Effect of Varying Fiber Dosages as Stirrup Substitutes in Torsion-Loaded Concrete Beams

Exploring the Effect of Varying Fiber Dosages as Stirrup Substitutes in Torsion-Loaded Concrete Beams

Study the Influence of Cable Breakage on Wind-Induced Vibration Characteristics of the Curved Beam Unilateral Stayed Bridge

Sectional Model Wind Tunnel Test and Research on Wind-Induced Vibration Response of Curved Beam Unilateral Stayed Bridge

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