Numerical Modeling of Concrete Deep Beams Made with Recycled Aggregates and Steel Fibers

Kachouh, Nancy; El‐Maaddawy, Tamer; El-Hassan, Hilal; El-Ariss, Bilal

doi:10.3390/buildings12050529

Cited by 10 publications

(6 citation statements)

References 42 publications

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“…An idealized trilinear tensile softening relationship was considered for the RCA-based concrete reinforced with BMF. The first steeper branch was assumed constant for all of the BMF-reinforced mixtures [27,31], but the slope of the next two branches varied based on the BMF content. Several iterations were conducted to determine the stress and strain values of the breaking points of the relationship at different contents of BMF, based on an inverse analysis of the flexural test results.…”

Section: Tensile Softening Lawmentioning

confidence: 99%

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Characteristics of Basalt Macro-Fiber Reinforced Recycled Aggregate Concrete

et al. 2022

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This study aims to examine the impact of using basalt macro-fibers (BMF) on characteristics of concrete made with recycled concrete aggregates (RCA). Test variables included the initial concrete grade (normal- and high-strength concrete (NSC and HSC)), RCA replacement percentage (30 and 60%), and BMF volume fraction (νf = 0.5 to 1.5%). The compressive strength reduction in the plain concrete caused by RCA was sensitive to the RCA replacement percentage rather than the initial concrete grade. The splitting and flexural strength reductions of the plain HSC caused by RCA were more significant than those of their NSC counterparts. The use of BMF compromised the concrete workability. Such a detrimental effect increased with the BMF content and was more pronounced for the HSC with 60% RCA. Reinforcing of RCA-based concrete with BMF tended to improve the mechanical properties. In some instances, the use of BMF at νf > 1% caused a decay in the strength gain. The addition of BMF to RCA-based concrete had a potential to fully restore the original splitting and flexural strengths of plain concrete mixtures made with natural aggregates (NA). The increase in the compressive strength of the RCA-based concrete caused by BMF was, however, not sufficient to fully restore the original strength of the NA-based plain concrete. The resistances to water penetration and abrasion of the RCA-based concrete improved by up to 17% and 47%, respectively, due to the addition of BMF. Idealized tensile softening laws were established for RCA-based concrete reinforced with BMF.

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Section: Tensile Softening Lawmentioning

confidence: 99%

“…Numerical simulation and analysis of RC structures made with RCA and nonmetallic fibers not only requires characteristic strength data but also information about the tensile softening behavior. Such a tension function can be obtained through an inverse analysis of flexural test data of tested concrete specimens [27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Basalt Macro-Fiber Reinforced Recycled Aggregate Concrete

et al. 2022

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“…In order to characterize the post-cracking behavior of concrete containing steel bers and recycled concrete aggregates (RCAs), Kachouh et.al. [17] developed a bilinear tensile softening law. At the higher value of vf of 3%, the impact of a/h on the shear strength gain of the solid deep beam models decreased.…”

Section: Introductionmentioning

confidence: 99%

Sustainable precast composite deep beams including concrete with partial replacement (50%) of recycled coarse aggregate

Shakir,

Alghazali

2024

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Three new sustainable models of a hybrid deep beam have been proposed in this work, which are the curved (CRV) and the arched (ARC1) and the modified arched (ARC2) in addition to the conventional (HRL) hybrid model that uses recycled coarse aggregates (RCA) instead of natural aggregates. The specimens indicate that steel fiber concrete (SFC) is used in high stress concentration areas and sustainable concrete is used in other areas. In relation to the parameters, the effects of hybridization types and inclined stirrups have all been studied. Results revealed that the failure capacity was increased by 8%, 22%, 21%, and 22%, for the for hybrid models respectively. On the other hand, the specimen (CTRL-SFC) showed a 19% enhancement. Regarding the flexural toughness, enhancement in 13%, 39%, 34%,71% for the hybrid models respectively compared to the non-hybrid model (CTRL-R50).The respective enhancement for the specimen (CTRL-SFC) was 52%.For the effective stiffness, results showed small range of enhancement (1.5-9)%. It is evident that the specimens' internal reinforcement detailing is adequate to stop the semi-diagonal mode of failure, which is an extremely brittle mode of failure. Furthermore, a replacement rate of up to 50% does not significantly affect the overall response. Moreover, The results of the tests indicated that the inclined alignment of the stirrups prevented diagonal cracking more than their vertical alignment. The proposed curved and arched models may be used with multi-concentrated loads, prestressed beam, precast walls. The proposed models aimed to produce lightweight / sustainable /low cost /high performance precast deep beams with compared to the horizontal hybrid model.

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“…Hence, the classical elastic beam theory of bending is not applicable to deep beams. A deep beam exhibits a very complicated stress state that can be described by the strut and tie action since the mechanical behavior of deep beam is governed by shear [1][2][3][4][5][6][7]. A comparison between deep beams and ordinary beams is listed in Table (A-1).…”

Section: -Introductionmentioning

confidence: 99%