An Experimental Study on the Behavior of Reinforced Concrete Bridge Piers Under Cyclic Loadings

Ohta, Minoru

doi:10.2208/jscej1969.1979.292_65

Cited by 7 publications

(5 citation statements)

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“…In this paper, the cracks that cut through member's cross section is defined as the "section crack". The formation of section crack is ordinarily regarded as a typical crack behavior for cyclic loaded RC member, and is likely to damage shear performance with a reduction of shear strength, since many studies mentioned that the RC members designed in flexure sometimes failed in shear after flexural yielding when subjected to cyclic loading (Ohta 1979;Ascheim and Jack 1992;Wong et al 1993;Priestley et al 1994). In addition to that, it is usual to observe section cracks due to drying shrinkage, thermal stress at the early stage of service life of concrete structure.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Influence of Section Pre-crack on Shear Strength and Shear Resistance Mechanism of RC Beams by Experiment and 3-D RBSM Analysis

Nakamura

Yamamoto

et al. 2017

ACT

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In order to investigate the influence of crack through section, which is often generated under cyclic loading, on the shear behavior and strength of RC beam, an experimental method was attempted to introduce a 0.5 mm and 1.0 mm-wide pre-crack, respectively, in beam cross section. The two pre-cracked beams were tested and the shear behaviors were compared with a non-cracked one. As the experimental result, it was found that the section pre-cracks led to a significant degradation of shear strength. Secondly, the different shear behaviors between pre-cracked and non-cracked beams were simulated by 3-D RBSM, and the developments of shear resistances were decomposed into the shear contributions provided by beam action and arch action. Based on the decomposition result, it became clear that the arch actions governed the grades of shear strengths and the section pre-cracks played a primary role in inducing extra crack behaviors and obstructing the longitudinal compressive stress transfer in concrete.

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Section: Introductionmentioning

confidence: 99%

Investigation of Influence of Section Pre-crack on Shear Strength and Shear Resistance Mechanism of RC Beams by Experiment and 3-D RBSM Analysis

Nakamura

Yamamoto

et al. 2017

ACT

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“…The 3-D RBSM analyses of cyclic loading and repeated loading on one side of the RC column tested by Oota [21] were conducted and it was confirmed that the analyses can accurately simulate the deformation behaviors until failure. The details of the objective RC column are shown in Fig.…”

Section: Numerical Modelmentioning

confidence: 77%

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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“…Cyclic and one‐side repeated loading analyses (3D RBSM) of a RC column designed as bridge pier tested by Oota et al were conducted and it was confirmed that the analyses can accurately simulate the deformation behaviors until failure. The details of the object RC column are shown in Figure a.…”

Section: Evaluation Of Shear Strength Degradation Of a Rc Column Subjmentioning

confidence: 85%

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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An Experimental Study on the Behavior of Reinforced Concrete Bridge Piers Under Cyclic Loadings

Cited by 7 publications

References 0 publications

Investigation of Influence of Section Pre-crack on Shear Strength and Shear Resistance Mechanism of RC Beams by Experiment and 3-D RBSM Analysis

Investigation of Influence of Section Pre-crack on Shear Strength and Shear Resistance Mechanism of RC Beams by Experiment and 3-D RBSM Analysis

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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