New models for reinforced concrete precast hybrid deep beams under static loads with curved hybridization

Shakir, Qasim M.; Hanoon, Hawraa K.

doi:10.1016/j.istruc.2023.05.084

Cited by 15 publications

(7 citation statements)

References 14 publications

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“…Consequently, significant enhancement in the performance of the deep beams. Several models of arching for the precast RC deep beams were proposed by Shakir and Hannon [21,22]. It was aimed to reduce the cost of deep beams by using the high strength concrete (steel fiber or reactive powder concrete) within the arching region only.…”

Section: -Flexural-shearmentioning

confidence: 99%

Effect of the arching action on the behavior of the RC precast concrete deep beams: comparison between several hybrid models

Shakir,

Alghazali

2024

J Build Rehabil

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Section: -Flexural-shearmentioning

confidence: 99%

Effect of the arching action on the behavior of the RC precast concrete deep beams: comparison between several hybrid models

Shakir,

Alghazali

2024

J Build Rehabil

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“…A series of innovative models of precast composite deep beams was proposed by Shakir and Hannon [22][23][24]. These model were based on the arching action and tied arch effects to consider the strength , weight and cost aspects.…”

Section: Introductionmentioning

confidence: 99%

“…While, other regions are made with normal strength concrete (NSC) or light-weight concrete (LWC). Shakir and Al-Ghazali [25,26] conducted further studies on the models proposed by Shakir and Hannon [24] then extended to considered the sustainability aspects by using the recycled concrete aggregate (RCA) in concrete out of the strut region. The goal is to create long-lasting, reasonably priced precast deep beams without a noticeable reduction in capacity.…”

Section: Introductionmentioning

confidence: 99%

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

Shakir,

Alghazali

2024

Preprint

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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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“…The methodology of this paper can provide a viable pathway for the investigation of the correlation between heterogeneity and mechanical strength of concrete, which may contribute to the improvement of the mechanical strength at the mesoscale. The results of this paper can be applied to the prediction of the concrete strength and cracking process in a non-destructive manner, which is valuable for checking the performance of the critical points (such as the beam-column joints, connections, and points of load applications) of construction members in actual engineering works [30,31].…”

Section: Introductionmentioning

confidence: 99%

Characterizing Splitting Failure of Concrete Influenced by Material Heterogeneity Based on Digital Image Processing Techniques

Lin,

Li,

et al. 2024

Buildings

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Concrete, as a composite material, is subject to heterogeneity in its mechanical properties and damage characteristics responding to load. In this paper, a numerical approach for analyzing the heterogeneous characteristics and the mechanical behavior of concrete specimens in tensile splitting tests using DIP techniques is introduced. The experiment involves the preparation of three types of concrete specimens with different strengths and performances of the tensile splitting test. The contour and position information of the different components in the split surface of a concrete specimen are reflected in the numerical model using the DIP techniques and the fracture of the split surface is realized by three types of cohesive elements in the finite element software ABAQUS. The results of the proposed numerical model are highly consistent with the experimental results with a maximum error of 4.77%, whereby the evolution of the splitting process is discussed. The simulation shows that the concrete fracture develops from the periphery towards the center of the concrete and the ITZ region splits first at similar strain levels, followed by the mortar region and finally the aggregate region. In addition, a simplified modeling scheme with faster computational efficiency and higher accuracy is proposed, which indicates that the shape of the heterogeneous components in concrete has a low effect on mechanical strength. The proposed model can accurately reflect the splitting fracture process of concrete which is instantaneous in the actual process, contributing to the understanding of the mechanism of the splitting fracture process and proposing a new methodology for simulating the fracture process of heterogeneous materials (e.g., concrete, rock). This work contributes to the understanding of the effect of material heterogeneity on concrete’s mechanical behavior and fracturing process and provides valuable hints for the research on the non-destructive prediction of concrete strength.

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New models for reinforced concrete precast hybrid deep beams under static loads with curved hybridization

Cited by 15 publications

References 14 publications

Effect of the arching action on the behavior of the RC precast concrete deep beams: comparison between several hybrid models

Effect of the arching action on the behavior of the RC precast concrete deep beams: comparison between several hybrid models

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

Characterizing Splitting Failure of Concrete Influenced by Material Heterogeneity Based on Digital Image Processing Techniques

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