Investigation of shear performance of UHPC by direct shear tests

Wu, Pengtao; Wu, Chengqing; Liu, Zhongxian; Hao, Hong

doi:10.1016/j.engstruct.2019.01.055

Cited by 61 publications

(17 citation statements)

References 21 publications

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“…In terms of benefits, the presence of fibres had a similar effect as for normal or high-strength concrete. An increase in steel fibre content generally produces lower shear crack widths and a less brittle behaviour [22]. A moderate number of stirrups can effectively restrain shear cracks and allow more parallel diagonal shear cracks to develop and propagate thoroughly within the shear span [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…A moderate number of stirrups can effectively restrain shear cracks and allow more parallel diagonal shear cracks to develop and propagate thoroughly within the shear span [23][24][25]. Shear performance of UHPSRFC was addressed through a limited number of push-off tests [22], T-beams [23,24] and I-beams with and without openings within the shear span [25]. Numerical simulations of UHPFRC behaviour using nonlinear procedures are limited to modelling the material response [26][27][28] or the flexural response RC beams incorporating UHPFC materials [19,29].…”

Section: Introductionmentioning

confidence: 99%

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Ultimate shear response of ultra-high-performance steel fibre-reinforced concrete elements

Ţibea¹,

Bompa

2020

Archiv.Civ.Mech.Eng

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This paper examines the experimental performance of ultra-high-performance steel fibre-reinforced concrete (UHPSFRC) beams subjected to loads at relatively low shear span-to-depth ratios. The results and observations from six tests provide a detailed insight into the ultimate response including shear strength and failure mode of structural elements incorporating various fibre contents. The test results showed that a higher fibre content results in an increase in ultimate capacity and some enhancement in terms of ductility. Detailed nonlinear numerical validations and sensitivity studies were also undertaken in order to obtain further insights into the response of UHPSFRC beams, with particular focus on the influence of the shear span-to-depth ratio, fibre content and flexural reinforcement ratio. The parametric investigations showed that a reduction in shear span-to-depth ratio results in an increase in the member capacity, whilst a reduction in the flexural reinforcement ratio produces a lower ultimate capacity and a relatively more flexible response. The test results combined with those from numerical simulations enabled the development of a series of design expressions to estimate the shear strength of such members. Validations were performed against the results in this paper, as well as against a collated database from previous experimental studies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultimate shear response of ultra-high-performance steel fibre-reinforced concrete elements

Ţibea¹,

Bompa

2020

Archiv.Civ.Mech.Eng

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“…Many studies have been performed to evaluate the shear behavior of R/UHPC. The results commonly indicated that a higher fiber content increased the ultimate shear strength, ductility, and crackwidth control ability of R/UHPC due to the improved tensile strength and ductility of UHPC at the material scale (Baby et al 2014a, b;Yousef et al 2018;Pourbaba et al 2018;Wu et al 2019). While steel fibers are a significant contribution to the ultimate shear strength of R/UHPC beams (Lim and Hong 2016;Hung and Wen 2020), the presence of stirrups is important to enhance the postpeak ductility of R/UHPC members, although it may cause blockage of fibers (Baby et al 2010).…”

Section: Shear Behavior and Designmentioning

confidence: 99%

A Review of Developments and Challenges for UHPC in Structural Engineering: Behavior, Analysis, and Design

2021

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The number of studies on ultrahigh-performance concrete (UHPC) or ultrahigh-performance fiber-reinforced concrete (UHP-FRC) for more resilient and sustainable reinforced concrete (RC) structures has rapidly increased in recent years due to the superior mechanical and durability properties of UHPC. The application of UHPC as a replacement for conventional concrete materials in various RC elements necessitates a thorough understanding of the structural behavior of the reinforced UHPC (R/UHPC) components under various types of loadings. This paper presents a systematic review of the state-of-the-art developments in R/UHPC elements. It addresses various topics including beams, columns, beam-column joints, shear walls, bridges, structural retrofitting, and applications such as seismic and impact. Due to the ultrahigh tensile, compressive, and bond strengths, unique strain-hardening behavior, and ductility of UHPC, R/UHPC structures may exhibit substantially different behavior than conventional RC structures at both the component and system levels. This implies that particular attention must be paid when design and analysis approaches for conventional RC elements are applied to R/UHPC elements, and suggests that developing new design philosophies is warranted to take advantage of UHPC's unique mechanical properties. The present paper summarizes the developments in analysis and design approaches for R/UHPC elements under axial forces, shear forces, and bending moments, and highlights the advantages and limitations of these approaches. Important design considerations for effectively utilizing UHPC in structural elements are also suggested. In addition to normal-strength steel reinforcing bars, the potential for reinforcing UHPC with high-strength steel bars, fiber-reinforced polymer components, and structural steel shapes is discussed based on the results of pioneering studies. Finally, this paper identifies challenges and suggests future directions for research on UHPC in structural engineering.

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“…Few experimental studies have been performed to determine the shear-friction characteristics in concrete with lightweight aggregates [7]- [9]. Some studied the various origins of aggregates [10] and others tried to develop highefficiency concrete [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Shear in sand-lightweight and conventional high strength concrete through the push-off test

Figueiredo

Soares

Garcia

et al. 2021

Rev. IBRACON Estrut. Mater.

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Shear design models in reinforced concrete structures depend on stress transfer through cracks. Such mechanism is influenced by the displacement and roughness of the opposite faces generated during cracking. Shear is reduced when an aggregate particle is fractured leading to a smoother crack as found in lightweight and high strength concrete. This study evaluated the ultimate shear strength of sand-lightweight and conventional high strength concrete as well as the differences in their behavior. Results from Pereira and Soares with 29 push-off test specimens were used. Transverse clamping stress ranged from 4.79 to 12.71 MPa while fcm was 30 and 50 MPa. The experimental results showed significant differences in the concrete studied. A tri-linear model was proposed to calculate the ultimate shear strength. An overall mean value of τu, exp/τu, cal was 0.96.

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Investigation of shear performance of UHPC by direct shear tests

Cited by 61 publications

References 21 publications

Ultimate shear response of ultra-high-performance steel fibre-reinforced concrete elements

Ultimate shear response of ultra-high-performance steel fibre-reinforced concrete elements

A Review of Developments and Challenges for UHPC in Structural Engineering: Behavior, Analysis, and Design

Shear in sand-lightweight and conventional high strength concrete through the push-off test

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