Bearing Strength Formula of Roughened Concrete Considering Vertical Projection Area

Musya, Ukyo; Katagiri, Yuki; Takase, Yuya; Abe, Takahide; Sakamoto, Keita; Hiwatashi, Takeshi; Katori, Keiichi

doi:10.3151/jact.17.309

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…The uneven surface was regarded as a cone. Moreover, the shear strength τ max was affected by the vertical projection area of the uneven surface and the value of the exponent of f c (Musya et al 2019). Then, by the regression analysis, the value of τ max,p is expressed by the following equation:…”

Section: Envelope Curve Of the Roughened Surfacementioning

confidence: 99%

Cyclic Behavior of Interfaces for Seismically Retrofitted RC Buildings

Yamada

Takase

Abe

2023

ACT

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In seismically retrofitted reinforced concrete (RC) structures, new members are connected to existing members using interfaces with roughened surfaces and post-installed dowel bars. During an earthquake, the interfaces are subjected to cyclic shear and normal stresses. Therefore, the structural design of interfaces is essential. In a previous study, normal and shear loads were applied to interface specimens. Moreover, a shear strength estimation method was proposed; however, the cyclic behavior was not discussed. This paper presents a cyclic model of the roughened surface in retrofitted RC structures. First, an envelope model was constructed using the previous shear strength estimation method and Saenz model, a constitutive law of concrete. Subsequently, the cyclic rules were modeled. Moreover, a previous dowel model was incorporated into the proposed cyclic model to estimate the test results. Finally, the proposed model provided reasonably estimated test results; the average ratio of the test results to the model results was 1.04. In addition, as δ increased, the effect of the dowel bar intensified in terms of shear.

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Section: Envelope Curve Of the Roughened Surfacementioning

confidence: 99%

Cyclic Behavior of Interfaces for Seismically Retrofitted RC Buildings

Yamada

Takase

Abe

2023

ACT

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“…[10] Moreover, the authors studied a roughened surface by a hammer and post-installed dowel bars. [1][2][11][12][13][14][15][16]. In the studies, the interfaces and the post-installed dowel bars were subjected to the tensile and shear stresses.…”

Section: Introductionmentioning

confidence: 99%

Modified Cyclic Model Of Interfaces With Roughened Surface And Dowel Bar Subjected To Normal And Shear Stresses

Takase,

Yamada,

Abe

2023

Proceedings of the 11th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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When reinforced concrete (RC) buildings are seismically retrofitted, new members are attached to existing members through interfaces with roughened surfaces using vibratory hammer and post-installed dowel bars. To attach extended members to the outside of an existing frame, the interfaces are subjected to bending moments and shear forces. In other words, interfaces are subjected to the compressive or tensile normal stresses in addition to shear stresses. However, the previous literature is limited in its investigation of the behaviors under such combined stresses. Therefore, in the authors' previous study, the shear strength estimation of the interfaces was proposed; and then, the cyclic model was presented. Although the proposed model can be applied to the interfaces subjected to tensile and shear stresses, the behavior under compressive normal stress was not discussed. Hence, in this study, the model was improved to estimate the cyclic behavior under the different normal stresses. The Saenz model, which is a constitutive law of concrete, was used to evaluate the envelope behavior. In addition, the peak stress was calculated by using the proposed estimation. For the compressive normal stress, the envelope model and peak stress were modified. Subsequently, the proposed cyclic rules were applied; and, a previous dowel model was incorporated into the modified model. The concrete compressive strength was set to 20-23 N/mm 2 , the diameters of the anchor bar were 13, 16, and 19 mm, the compressive normal stress was set to -0.48 N/mm 2 , and the tensile ratio rN was set to 0.00, 0.33, and 0.66. Epoxy adhesive was used. As a result, the modified model agreed well with the test results; the average ratio of the test results to the model results was 0.91-1.12. In addition, with the increase of δ, the effect of the dowel bar was intensified; whereas, under the compressive normal stress, it became insignificant. Finally, it was concluded that the modified model could reasonably estimate the behavior under the various stresses.

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Shear strengths of joints with roughened concrete surfaces and post-installed dowel bars subjected to normal and shear stresses for seismically retrofitted structures

Takase

Yamada

2022

Structures

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Bearing Strength Formula of Roughened Concrete Considering Vertical Projection Area

Cited by 4 publications

References 7 publications

Cyclic Behavior of Interfaces for Seismically Retrofitted RC Buildings

Cyclic Behavior of Interfaces for Seismically Retrofitted RC Buildings

Modified Cyclic Model Of Interfaces With Roughened Surface And Dowel Bar Subjected To Normal And Shear Stresses

Shear strengths of joints with roughened concrete surfaces and post-installed dowel bars subjected to normal and shear stresses for seismically retrofitted structures

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