Shear Resistance Mechanism Evaluation of RC Beams Based on Arch and Beam Actions

Nakamura, Hikaru; Iwamoto, Takuya; Fu, Li; Yamamoto, Yoshihito; Miura, Taito; Gedik, Yasar Hanifi

doi:10.3151/jact.16.563

Cited by 35 publications

(13 citation statements)

References 14 publications

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“…In the case of RN, after the predominance of V a , V bc was maintained at around 20 kN with the appearance of V bs owing to the confinement effect of the stirrup. This phenomenon has been confirmed in previous studies, for example, the study of Nakamura et al (2018). In the case of M1 and M2, the magnitude of V a showed a higher value than that of N when the loads reached their maximum in each case.…”

Section: Load Carrying Mechanismsupporting

confidence: 86%

An Analytical Study on Interactions of Artificial Cracks and Holes Contributing to Increases in the Shear Strengths of RC Beams

Yamada

2019

ACT

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This study investigated the effects of cracks along rebars in reinforced concrete (RC) beams with multiple holes inside the shear spans mainly based on nonlinear finite element (FE) analyses. The analytical parameters were the hole positions that increased the shear strengths of RC beams in static loading experiments, the crack positions, and the widths. As a result of the analyses, for beams with holes arranged from near the loading points toward the positions of tensile rebars at the mid-shear span with no stirrups, when the beams had a horizontal crack, the strengths increased to the flexural capacities. However, when the beam had vertical cracks, the strength decreased to 80% for beams without holes. Meanwhile, for beams with holes arranged from the bottom side of the loading points toward the mid-height with no stirrups, the strength increased to between 110% and 160% compared with beams without holes regardless of the crack positions. Moreover, the shear behaviors of the beams did not change when the equivalent crack width exceeded 0.3 mm for each case, and changes in the behaviors of beams with stirrups were negligibly small regardless of the hole positions. It was made clear that changes in the behaviors were caused by the contributions of arch mechanisms enhanced by localizations and expansions of the minimum principal stress distributions owing to the multiple holes.

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Section: Load Carrying Mechanismsupporting

confidence: 86%

An Analytical Study on Interactions of Artificial Cracks and Holes Contributing to Increases in the Shear Strengths of RC Beams

Yamada

2019

ACT

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“…The analytical method used in this study is 3-D RBSM (Yamamoto et al 2008), which enables to directly express discontinuous behaviors of concrete, such as cracking and fracturing. It has been verified by several studies that this method can reproduce the crack propagation and shear failure behavior of RC members with good accuracy (Yamamoto et al 2010(Yamamoto et al , 2014Gedik et al 2012;Fu et al 2017Fu et al , 2020Nakamura et al 2018).…”

Section: Three-dimensional Rigid-body Spring Model (3-d Rbsm)mentioning

confidence: 76%

“…It is known that the shear resistance mechanism of an RC member consists of beam and arch actions (Park et al 1975), and that these can be decoupled using analytical results obtained by 3D-RBSM (Fu et al 2017(Fu et al , 2020Nakamura et al 2018).…”

Section: Decoupling Of Shear Resistance Mechanismsmentioning

confidence: 99%

“…There are study cases in which these shear resistance mechanisms have been decoupled from the results of loading tests on RC beam specimens using reinforcement strain measurements (Kim et al 1999;Nakamura et al 2006;Yamada 2019;Gunawan et al 2020). On the other hand, it is possible to evaluate these mechanisms directly using numerical methods that allow visualization of stresses at specific positions (Fu et al 2017(Fu et al , 2020Nakamura et al 2018;Yamada 2019). Nakamura et al (2018) discussed the shear resistance mechanism of RC beams with shear reinforcements using a three-dimensional rigid-body spring model (3-D RBSM) (Yamamoto et al 2008), showing that it can evaluate the shear failure behavior of RC members with high accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, it is possible to evaluate these mechanisms directly using numerical methods that allow visualization of stresses at specific positions (Fu et al 2017(Fu et al , 2020Nakamura et al 2018;Yamada 2019). Nakamura et al (2018) discussed the shear resistance mechanism of RC beams with shear reinforcements using a three-dimensional rigid-body spring model (3-D RBSM) (Yamamoto et al 2008), showing that it can evaluate the shear failure behavior of RC members with high accuracy. This work clarified that the shear resistance mechanism at the maximum load consists of beam action, which is mostly truss action, and concrete arch action, regardless of the shear span to depth ratio.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical Study on the Effect of Different Shear Reinforcement Shapes on Shear Failure Behavior and Shear Resistance Mechanism of RC Beams

Kawamura

Nakamura

Takemura

et al. 2021

ACT

Self Cite

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The authors have reported from experimental investigation that the use of closed stirrups, U-shaped stirrups and rod-shaped reinforcements as shear reinforcements in reinforced concrete (RC) beams results in clear differences in internal crack patterns and maximum strength. In this study, simulations of the experimental beams were performed using a three-dimensional rigid-body spring model, demonstrating that the behavior observed in the experiments is a mechanical phenomenon that can be reproduced numerically. Using the stress distribution over the beam cross section obtained from the analysis, the beam and arch action components of shear resistance are decoupled and considered from the perspective of the shear resistance mechanism. Further, through analysis of additional cases, the role of the upper and lower horizontal legs of the shear reinforcement, the effect of end anchorages on rod-shaped reinforcements were clarified.

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Numerical evaluation of the internal fracture mechanism of the single PBL shear connector considering the effects of position and strength of the transverse rebar

Karam,

Nakamura,

Yamamoto

et al. 2024

Structural Concrete

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The perfobond (PBL) shear connector reinforced with transverse rebar effectively contributes to sufficient ductility, bearing capacity, and anti‐fatigue behavior to hybrid structures. The construction practice involves the placement of the transverse rebar at the bottom position within the concrete dowel, whereas past studies employed transverse rebar in the center of the dowel; hence, there exists a gap between literature and design practices. Furthermore, there is no specific information in the design guidelines for hybrid structures on the influence of the position of the transverse rebar. Therefore, the current research deals with the analytical investigations employing the coupled Rigid Body Spring Model (RBSM) and the nonlinear solid Finite Element Method (FEM) that encompass the internal fracture behavior of concrete with the various parameters of transverse rebar, particularly the position and strength, to recognize the failure mechanism. It was determined that the numerical model accurately captured the test shear capacity and failure modes. The internal failure process of a specimen with transverse rebar at the bottom position, identical to actual field practice, revealed that as the height of the concrete region above the rebar rises, more compressive stresses in a trapezoidal manner are being generated, leading to an enhancement of the deformation capacity. Furthermore, it was confirmed that the specimen with the transverse rebar inserted at the bottom generates the greatest axial force, which is followed by the greatest shear capacity.

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Shear Resistance Mechanism Evaluation of RC Beams Based on Arch and Beam Actions

Cited by 35 publications

References 14 publications

An Analytical Study on Interactions of Artificial Cracks and Holes Contributing to Increases in the Shear Strengths of RC Beams

An Analytical Study on Interactions of Artificial Cracks and Holes Contributing to Increases in the Shear Strengths of RC Beams

Analytical Study on the Effect of Different Shear Reinforcement Shapes on Shear Failure Behavior and Shear Resistance Mechanism of RC Beams

Numerical evaluation of the internal fracture mechanism of the single PBL shear connector considering the effects of position and strength of the transverse rebar

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