Sectional analysis for design of ultra-high performance fiber reinforced concrete beams with passive reinforcement

Xia, Jun; Chan, Titchenda; Mackie, Kevin R.; Saleem, M. A.; Mirmiran, Amir

doi:10.1016/j.engstruct.2018.01.035

Cited by 18 publications

(7 citation statements)

References 7 publications

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“…On the other hand, although some recommendations [1,[41][42][43] were presented with regard to the flexural moment capacity of the SF-UHPC members, these approaches have not been included in a design code yet. Many efforts were conducted to practically predict the capacities of SF-UHPC beams investigating the shape of concrete stress block, ultimate strain capacity, fibers' geometrical properties, volumetric ratio, orientation, bond stress as well as other parameters affecting the tensile stress distribution [44][45][46][47][48][49][50][51][52]. In the second part of numerical investigation, the flexural capacities of test beams, except the shear dominant beams, were numerically predicted based on the model proposed in ACI 544 code [53] and adaptation in Imam et al [48] for the calculation of equivalent concrete tensile strength.…”

Section: Numerical Predictions Of the Shear And Flexural Capacitiesmentioning

confidence: 99%

Impact of Reinforcement Ratio on Shear Behavior of I-Shaped UHPC Beams with and without Fiber Shear Reinforcement

Yavaş

Goker

2020

Materials

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In the presented paper, the impacts of steel fiber use and tensile reinforcement ratio on shear behavior of Ultra-High Performance Concrete (UHPC) beams were investigated from the point of different tensile reinforcement ratios. In the scope of the experimental program, a total of eight beams consisting of four reinforcement ratios representing low to high ratios ranged from 0.8% to 2.2% were casted without shear reinforcement and subjected to the four-point loading test. While half of the test beams included 30 mm end-hooked steel fibers (SF-UHPC) with 2.0 vol%, the remaining beams were produced without the fiber to show possible effectiveness of the fiber use. The shear performances were discussed in terms of the load—deflection response, cracking pattern and failure mode, first cracking load and ultimate shear strength. In this sense, all the non-fiber beams were failed by shear with a dramatic load drop, regardless of the tensile reinforcement amount, before the yielding of reinforcement and they produced no deflection capability. The test results showed that while the inclusion of steel fibers to the UHPC mixture with low reinforcement ratios changed the failure mode from the shear to flexure, it significantly enhanced the ultimate shear strength in the case of higher reinforcement ratio through the SF-UHPC’ superior mechanical properties and fibers’ crack-bridging ability.

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Section: Numerical Predictions Of the Shear And Flexural Capacitiesmentioning

confidence: 99%

Impact of Reinforcement Ratio on Shear Behavior of I-Shaped UHPC Beams with and without Fiber Shear Reinforcement

Yavaş

Goker

2020

Materials

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“…Regarding the other part, although some recommendations [1,2,4,5] were presented with regard to the flexural moment capacity of the UHP-FRC members, these approaches have not been included yet in a design code. Many efforts were conducted to practically calculate the capacities of both high strength and ultra-high strength fiber-reinforced concrete members, investigating the shape of the concrete stress block, ultimate strain capacity, fibers' geometrical properties, volumetric ratio, orientation, and bond stress, as well as other parameters affecting the tensile stress distribution [42][43][44][45][46][47][48][49][50]. More recently, the authors of this study proposed a numerical approach to predict the nominal moment capacity of UHP-FRC beams with rectangular cross-sections [14].…”

Section: Numerical Predictions Of the Shear And Flexural Capacitiesmentioning

confidence: 99%

Steel Fiber Use as Shear Reinforcement on I-Shaped UHP-FRC Beams

et al. 2019

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In the presented paper, the effectiveness of steel fiber use on the shear and flexure behaviors of ultra-high performance concrete (UHPC) beams and the feasibility of steel fibers in place of shear reinforcement were investigated experimentally. In this framework, a total of four I-shaped UHPC beams were produced for a high tensile reinforcement ratio of 2.2%. While two of them were non-fiber UHPC beams with and without the shear reinforcement to show the contribution of steel fibers, the remaining beams were made from the ultra-high performance steel fiber-reinforced concrete (UHP-FRC) having the short straight fibers with 1.5% and 2.5% by volume. The shear and flexural parameters, such as the load–deflection response, cracking pattern, failure mode, deflection, and curvature ductilities were discussed based on the four-point loading test results. While the reference beam without fiber and shear reinforcement failed by the shear with a sudden load drop before the yielding of reinforcement and produced no deflection capability, the inclusion of steel fibers to the UHPC matrix transformed the failure mode from shear to flexure through the fibers’ crack-bridging ability. It might be deduced that the moderate level of steel fiber use in the UHP-FRC beams may take the place of shear reinforcement in practical applications.

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“…It is noteworthy that some references on the prediction of the ultimate moment of UHPC structural elements are available in [23][24][25]; however, these methods have not yet been adopted in the international design codes. Additionally, many prediction formulas have been developed that incorporate the inelastic response of UHPC [12,[26][27][28][29][30]. These references have been fundamentally employed in the moment-curvature prediction.…”

Section: Introductionmentioning

confidence: 99%

“…Such studies are conducted to investigate the sectional stress and strain distributions, the physicomechanical characteristics (i.e., tensile strength, shape, aspect ratio, etc. ), and content, dispersion, the bonding strength of fibers, and other factors impacting the tensile behavior of UHPC [30][31][32][33][34][35][36][37][38]. However, these investigations have only addressed the use of single-kind fibers, and very little information (e.g., [10]) is obtainable on the use of a hybrid system of fibers in UHPC.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Non-Shear-Strengthened UHPC Beams under Flexural Loading: Influence of Reinforcement Percentage

et al. 2021

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In the present work, the structural responses of 12 UHPC beams to four-point loading conditions were experimentally and analytically studied. The inclusion of a fibrous system in the UHPC material increased its compressive and flexural strengths by 31.5% and 237.8%, respectively. Improved safety could be obtained by optimizing the tensile reinforcement ratio (ρ) for a UHPC beam. The slope of the moment–curvature before and after steel yielding was almost typical for all beams due to the inclusion of a hybrid fibrous system in the UHPC. Moreover, we concluded that as ρ increases, the deflection ductility exponentially increases. The cracking response of the UHPC beams demonstrated that increasing ρ notably decreases the crack opening width of the UHPC beams at the same service loading. The cracking pattern the beams showed that increasing the bar reinforcement percentages notably enhanced their initial stiffness and deformability. Moreover, the flexural cracks were the main cause of failure for all beams; however, flexure shear cracks were observed in moderately reinforced beams. The prediction efficiency of the proposed analytical model was established by performing a comparative study on the experimental and analytical ultimate moment capacity of the UHPC beams. For all beams, the percentage of the mean calculated moment capacity to the experimentally observed capacity approached 100%.

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Sectional analysis for design of ultra-high performance fiber reinforced concrete beams with passive reinforcement

Cited by 18 publications

References 7 publications

Impact of Reinforcement Ratio on Shear Behavior of I-Shaped UHPC Beams with and without Fiber Shear Reinforcement

Impact of Reinforcement Ratio on Shear Behavior of I-Shaped UHPC Beams with and without Fiber Shear Reinforcement

Steel Fiber Use as Shear Reinforcement on I-Shaped UHP-FRC Beams

Behavior of Non-Shear-Strengthened UHPC Beams under Flexural Loading: Influence of Reinforcement Percentage

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