Bending and shear behavior of ultra-high performance fiber reinforced concrete

Magureanu, C.; Sosa, Ioan; Negruțiu, Camelia; Hegheş, Bogdan

doi:10.2495/hpsm100081

Cited by 16 publications

(13 citation statements)

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“…The third phase of the beam's inelastic phase is the strain softening phase (from U to F) where it finally failed at point F. Fig. 13 also showed that increase in applied load also leads to increase in midspan displacement of the beam in agreement with Magureanu et al [41]; as the experimental midspan displacement of the UHPC beam with stirrups at cracking and ultimate load of 35 and 390.3 kN was 0.4 and 13.2 mm, respectively. The midspan displacement at cracking and ultimate load of 39 and 400 kN was 0.35 and 13.0 mm, respectively for the numerically simulated UHPC beam with stirrups and steel fibers; while the numerically simulated UHPC beam with stirrups but without steel fibers has midspan displacement of 0.55 and 13.8 mm at cracking and ultimate load of 30 and 350 kN, respectively.…”

Section: Load-midspan Displacement Behavior Of the Uhpc Beamssupporting

confidence: 84%

Simplified and Cost-Effective Method of Studying the Effect of Steel Fibers on Ultra-high Performance Concrete Specimens’ Properties/Members’ Performance

Smith

2022

Period. Polytech. Civil Eng.

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This research work, which presents a simplified technique of modelling steel fibers, uses python algorithm that can be directly run in ABAQUS to automatically generate the location and orientation of steel fibers in a rectangular ultra-high performance concrete specimen, so that the effect of steel fibers on the properties of such a specimen can be directly investigated through numerical simulation. This method is fast, can be applied to structural members of bigger dimensions (like beams, columns, slabs) unlike the existing methods that are only applicable to small size specimens, and also solves the problem associated with previous methods where some fibers may be generated and placed outside the boundary of a specimen, leading to the discard and regeneration of those fibers. To assess the validity of this method, experiments were conducted on the compressive properties of three ultra-high performance concrete cube specimens and the shear performance of two ultra-high performance concrete beams, and the results were compared with the ones obtained using this method. Results indicate over 97% agreement between the experiment and the numerical simulation in ultimate compression force and shear resistance at shear crack and ultimate load phases. The comparison also reveals perfect agreement in the failure mode and crack pattern of the specimens.

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Section: Load-midspan Displacement Behavior Of the Uhpc Beamssupporting

confidence: 84%

Simplified and Cost-Effective Method of Studying the Effect of Steel Fibers on Ultra-high Performance Concrete Specimens’ Properties/Members’ Performance

Smith

2022

Period. Polytech. Civil Eng.

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“…As mentioned before, concrete materials with relatively longer fibres with l f /d f = 62.5 or a fibre blend of long (l f /d f = 62.5) and short (l f /d f = 34.3) elements, with volumetric contents V f of 1.5%, 2.0% and 2.55%, were used in the structural members. It is worth noting that a previous study on members subjected to shear action that incorporated similar concrete materials with 0% and 2.0% fibres showed that the presence of fibres increased the ultimate capacity of the fibrous concrete (UHPFRC) with up to twofold, and the corresponding ultimate displacement threefold in comparison the counterpart without fibres (UHPC) [36]. The same study indicated that the presence of 2.0% fibres increases the flexural strength with up to 150% of the non-fibre-reinforced concrete, whilst enhancing the postpeak response.…”

Section: Test Resultsmentioning

confidence: 95%

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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“…The experimental dataset in this study was collected from previously published works discussing about the shear strength of the simply supported beam (ZHANG HZ 2005;Magureanu et al 2010;Ji et al 2011;Baby et al 2014;Xu et al 2014;Kamal et al 2014;Zhou JM and Chen S 2015;Hou et al 2015;Jin et al 2015;Lim and Hong 2016;Pansuk et al 2017;Smarzewski 2018;Yousef et al 2018;Mészöly and Randl 2018;Hasgul et al 2019;Zheng et al 2019;Krassowska et al 2019;Qi et al 2020;Wang et al 2020). The typical RC beam with stirrups and its geometric parameters are illustrated in Fig.…”

Section: Data Constructionmentioning

confidence: 99%

Modeling shear strength of medium- to ultra-high-strength concrete beams with stirrups using SVR and genetic algorithm

Jiang

Liang

2021

Soft Comput

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This paper presents a data-driven machine learning approach of support vector regression (SVR) with genetic algorithm (GA) optimization approach called SVR-GA for predicting the shear strength capacity of medium-to ultra-high strength concrete beams with longitudinal reinforcement and vertical stirrups. 148 experimental samples collected with different geometric, material and physical factors from literature were utilized for SVR-GA with 5-fold cross validation. Shear influence factors such as the stirrup spacing, the beam width, the shear span-to-depth ratio, the effective depth of the beam, the concrete compressive and tensile strength, the longitudinal reinforcement ratio, the product of stirrup ratio and stirrup yield strength were served as input variables. The simulation results show that the predicted shear strength of SVR-GA model can achieve high accuracy based on testing set with a coefficient of determination (R 2 ) of 0.9642, root mean squared error (RMSE) of 1.4685 and mean absolute error (MAE) of 1.0216 superior to that for traditional SVR model with 0.9379, 2.0375 and 1.4917. The sensitivity analysis reveals that the most important variables affecting the prediction of the shear strength are shear span-to-depth ratio, concrete compressive strength, reinforcement ratio and the product of stirrup ratio and stirrup yield strength. Three-dimensional input/output maps can vividly reflect the nonlinear variation of the shear strength with the two coupling variables. All in all, the proposed SVR-GA model presents an effective and accurate artificial intelligence technology for modeling the shear strength of ultra-high strength concrete beams with stirrups.

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Bending and shear behavior of ultra-high performance fiber reinforced concrete

Cited by 16 publications

References 1 publication

Simplified and Cost-Effective Method of Studying the Effect of Steel Fibers on Ultra-high Performance Concrete Specimens’ Properties/Members’ Performance

Simplified and Cost-Effective Method of Studying the Effect of Steel Fibers on Ultra-high Performance Concrete Specimens’ Properties/Members’ Performance

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

Modeling shear strength of medium- to ultra-high-strength concrete beams with stirrups using SVR and genetic algorithm

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