Studies on the Effect of Bond on the Shear Behavior of Reinforced Concrete Beams

Ikeda, Shoji; Uji, Kimitaka

doi:10.2208/jscej1969.1980.101

Cited by 9 publications

(8 citation statements)

References 2 publications

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“…12b, the elevated shear capacity is numerically obtained by nonlinear analysis with multi-directional fixed crack modelling (Maekawa et al 2003a;Okamura et al 1991). This fact coincides with the experimental ones where de-bonded longitudinal reinforcement is used (Ikeda et al 1980) with no premature failure of anchorage.…”

Section: Overall Performancesupporting

confidence: 90%

“…As previously pointed out, shear strength enhancement is preserved if sufficient anchorage of the longitudinal reinforcement is provided (Takewaka et al 1984, Ikeda et al 1980. Therefore, corrosion of the reinforcement inside the shear span may possibly cause premature failure of the anchorage, resulting in total deterioration of member capacity.…”

Section: Overall Performancementioning

confidence: 93%

“…On the other hand, a significant loss of shear capacity was observed when the anchorage area was subjected to cracking damage. As a matter of fact, Ikeda and Uji (1980) experimentally demonstrated that the shear capacity is improved when the bond between the main reinforcement in the tension zone and the concrete disappears due to the formation of an arch mechanism or the retardation of diagonal shear crack propagation. Consequently, in the next experiment, the RC beam with inherent crack-like defects on the whole shear span was experimentally investigated as case 6.…”

Section: Specimenmentioning

confidence: 99%

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Interaction of Pre-Induced Damages along Main Reinforcement and Diagonal Shear in RC Members

Toongoenthong

Maekawa

2004

ACT

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The mechanical interaction of pre-induced damage and diagonal shear was investigated with regard to corrosion cracks in concrete and rupture of the web reinforcement along the main reinforcement. First, localized corrosion cracking was produced in concrete around the mid-span of beams in both compression and tension fibers, and a mechanical interaction was no longer identified. Next, cracking occurred near the beam supports inside a shear span and around the anchorage zones of longitudinal steel. A diagonal shear crack was observed to meet the pre-existing cracking around the anchorage zones of longitudinal steel. Crack propagation into the anchorage zones resulted in significant decline in the overall capacity. On the other hand, the overall capacity could be maintained or even increased by keeping anchorage failure from occurring. Finally, RC beams with artificial defects in both concrete and web reinforcement over the whole shear span were tested. Damage around anchorage zones was concluded to play a critical role in triggering shear sliding failure in pre-damaged reinforced concrete.

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Section: Overall Performancesupporting

confidence: 90%

Section: Overall Performancementioning

confidence: 93%

Section: Specimenmentioning

confidence: 99%

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Interaction of Pre-Induced Damages along Main Reinforcement and Diagonal Shear in RC Members

Toongoenthong

Maekawa

2004

ACT

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“…Cubic compressive strength of concrete reported in some tests was converted to the cylindrical compressive strength according to Neville's empirical relation. 45 Finally, the following equation is proposed for the mean nominal shear strength of reinforced concrete beams with a/d equal to or greater than 3.0 (21) in which f′ c and v u are in MPa and d is in mm. Fig.…”

Section: Development Of Equationmentioning

confidence: 99%

Prediction of Shear Strength of Reinforced Concrete Beams without Web Reinforcement

Kim¹

1996

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A rational and mechanics-based equation is proposed for the prediction of shear strength of reinforced concrete beams without web reinforcement. This prediction is based on basic shear transfer mechanisms, a modified Bazant's size effect law, and numerous published experimental data, including high-strength concrete beams with compressive strengths of concrete up to 100 MPa (14,500 psi). Comparisons with experimental data indicate that the proposed equation estimates properly the effects of primary factors, such as concrete strength, longitudinal steel ratio, shear span-to-depth ratio, and effective depth. It is shown that the proposed equation is considered to be better than the other equations compared in this study with respect to accuracy and estimation of primary factors. A simplified design equation is also derived within the limited range of effective depth for practical purposes.

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“…Elimination of the bond between the longitudinal bars and the surrounding concrete leads to a major change in stress distribution inside the concrete [8][9][10][11]. With no flexural cracks in an unbonded shear span, it is apparent that the concrete body mainly remains under diagonal compression with a straight thrust line resembling a tied arch mechanism.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of bond controlled RC columns

Pandey

Mutsuyoshi

Maki

2008

Engineering Structures

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Studies on the Effect of Bond on the Shear Behavior of Reinforced Concrete Beams

Cited by 9 publications

References 2 publications

Interaction of Pre-Induced Damages along Main Reinforcement and Diagonal Shear in RC Members

Interaction of Pre-Induced Damages along Main Reinforcement and Diagonal Shear in RC Members

Prediction of Shear Strength of Reinforced Concrete Beams without Web Reinforcement

Seismic performance of bond controlled RC columns

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