Evaluation of Shear Strength Degradation of Rc Member Subjected to Cyclic Loading

Nakamura, Hikaru; Furuhashi, Hiroki; Yamamoto, Yoshihito; Miura, Taito

doi:10.2208/jscejmcs.71.48

Cited by 4 publications

(15 citation statements)

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“…Recently, Nakamura et al (2015) succeeded in establishing a numerical approach to quantitatively evaluate the degradation behavior of shear strength of a RC member subject to cyclic load by utilizing the Three 1 Dimensional Rigid-Body-Spring-Method (3-D RBSM), and showed the degradation behaviors of shear strength corresponding to three crucial structural factors (tensile reinforcement ratio, shear reinforcement ratio and axial compression load). Moreover, their results confirmed that the initial shear strength of a RC column will degrade remarkably under cyclic load with the increasing displacement ductility, whereas will not be significantly affected under one-side repeated load.…”

Section: Research Backgroundmentioning

confidence: 99%

“…Moreover, their results confirmed that the initial shear strength of a RC column will degrade remarkably under cyclic load with the increasing displacement ductility, whereas will not be significantly affected under one-side repeated load. On the basis of this work, Fu et al (2017) attempted to explain the degradation mechanism of shear strength of a standard RC column discussed in the research conducted by Nakamura et al (2015). Combining the theory of beam and arch actions and 3-D RBSM numerical method, they developed a practical procedure to decouple the beam and arch actions, truss action and concrete contribution for beam action separately from the initial or residual shear strength at each displacement ductility.…”

Section: Research Backgroundmentioning

confidence: 99%

“…In this study, based on the research works of Nakamura et al (2015) and Fu et al (2017), the individual effect of structural factors on the degradation behavior of shear strength was separately evaluated, and meanwhile the corresponding effect mechanism was clearly explained by the analysis of beam and arch actions. Attributed to the reveal of the shear resistance mechanism for each structural factor, this study will contribute to discussion of more accurate degradation curves of concrete shear contribution, evaluation of the deformation capacity considering the mechanism and the practical improvement method of deformation capacity, all of which were useful knowledge in terms of the shear failure of RC member after flexural yielding under cyclic loads.…”

Section: Research Significancementioning

confidence: 99%

“…The numerical results of a part of the above models, which were derived from the S1 modelling experiment test, had been investigated by Nakamura et al (2015) and Fu et al (2017). The numerical analysis for the model group "A1-A3" at various shear reinforcement ratios had been conducted by Nakamura et al (2015). The model group "B1-B2" at various shear span-depth ratios was firstly provided in this study.…”

Section: Numerical Modelmentioning

confidence: 99%

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Effect of Various Structural Factors on Shear Strength Degradation after Yielding of RC Members under Cyclic Loads

Nakamura

Yamamoto

et al. 2020

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Shear failure after flexural yielding is a typical failure mode for a reinforced concrete (RC) member subject to cyclic load, and it is caused by the phenomenon that the initial shear strength is decreased with the increasing plastic ductility until the shear capacity degrades to be lower than the flexural strength. In this study, the flexure-shear behaviors of a number of RC columns with a relatively wide range of crucial structural factors involving tensile reinforcement ratio, shear reinforcement ratio, shear span-depth ratio (covering deep and slender columns) and axial compression load were simulated by the Three Dimensional Rigid-Body-Spring-Method, and the degradation behaviors of shear strength of all specimens were quantitatively evaluated to comprehend the effect of the structural factors. Moreover, the degradation behaviors of shear strength were decoupled into the degradation behaviors of shear resistance components (beam action, arch action, truss action, concrete contribution for beam action) to clarify the mechanism of shear failure after flexural yielding for the RC columns at various crucial structural factors. Consequently, the effect of crucial structural factors on the degradation behaviors of shear strength and shear resistance components were understood and it was concluded that the stepwise degradation of arch action was the dominant mechanism for the investigated structural factors for the shear failure after flexural yielding of RC column. This paper is an extended version in English from the authors' previous publication [

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Section: Research Backgroundmentioning

confidence: 99%

Section: Research Backgroundmentioning

confidence: 99%

Section: Research Significancementioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

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Effect of Various Structural Factors on Shear Strength Degradation after Yielding of RC Members under Cyclic Loads

Nakamura

Yamamoto

et al. 2020

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“…In this chapter, the numerical result of shear failure after flexural yielding of a RC column simulated by 3-D RBSM was discussed [20].…”

Section: Simulation Of Shear Failure After Flexural Yielding Of Tensimentioning

confidence: 99%

Evaluation of Shear Strength Degradation of RC Column Subjected to Cyclic Loading

Nakamura²,

Furuhashi³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Mechanism of shear strength degradation of a reinforced concrete column subjected to cyclic loading

Nakamura

Furuhashi

et al. 2017

Structural Concrete

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The purpose of this study was to investigate the mechanism of shear strength degradation of a reinforced concrete (RC) member under cyclic loading. First, the shear failure after flexural yield of tension reinforcing bars of a RC column designed as bridge pier under cyclic loading was simulated by the method of three-dimensional rigid-body-spring-model (3D RBSM) and the shear strength degradation was quantitatively evaluated by a numerical approach. Afterward, based on the shear resistant mechanism, the degraded shear strengths after each load cycle were decoupled into the contributions provided by beam action and arch action, with the use of the numerical local stress results. As the important finding, the mechanism of shear strength degradation due to cyclic loading of the RC column was concluded as with the increase of deformation level, the arch action first degraded gradually whereas the beam action maintained its original capacity; then after losing most capacity of the arch action, the beam action began to decrease rapidly, which caused the shear failure. K E Y W O R D Sarch action, beam action, cyclic loading, RC column, shear strength degradation | INTRODUCTIONIn the seismic design of a reinforced concrete (RC) member, one of the basic requirements is that brittle shear failure is prevented and the shear strength exceeds the shear demand corresponding to the flexural strength. 1-3Although a well-designed RC member under monotonic loading ordinarily suffers flexural failure and shows good deformation performance, if subjected to cyclic loading, the load-bearing capacity often decreases within a relatively small displacement ductility after the flexural yield of the tension reinforcing bars and ultimately shear failure occurs (called shear failure after flexural yield in this study). Because the deformation ability of a RC member under cyclic loading is significant in seismic deformationbased design, many researchers have investigated the influences of several factors such as web reinforcement ratio, tension reinforcement ratio, axial load, and shear span-to-depth ratio for the ultimate deformation ductility of RC members by numerical and experimental methods. [4][5][6][7][8] As shown in Figure 1, the reason for shear failure after the flexural yield of a RC member has been conceptually explained as that the shear strength degrades gradually with the increase of displacement level and ultimately becomes less than the shear demand corresponding to the flexural strength, which leads to a decrease of loadbearing capacity. Corresponding to this failure mode, the relationship between degraded shear strength and displacement ductility (also called the shear capacity degradation curve) was proposed for the first time by the ATC seismic design guidelines. 9

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Evaluation of Shear Strength Degradation of Rc Member Subjected to Cyclic Loading

Cited by 4 publications

References 3 publications

Effect of Various Structural Factors on Shear Strength Degradation after Yielding of RC Members under Cyclic Loads

Effect of Various Structural Factors on Shear Strength Degradation after Yielding of RC Members under Cyclic Loads

Evaluation of Shear Strength Degradation of RC Column Subjected to Cyclic Loading

Mechanism of shear strength degradation of a reinforced concrete column subjected to cyclic loading

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