Property of Cement Based Adhesive Anchor Constructed Below Zero and Estimation of Mechanical Behavior

Matsunaga, Kenya; Takase, Yuya; Abe, Takahide; ORITA, Genta; Ando, Shigehiro

doi:10.3130/aijs.87.556

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…Figure 5 shows the shear load-slip (Q-δ) curves of the test and dowel model (Takase 2019;Matsunaga et al 2021Matsunaga et al , 2022 with d d = 16 mm and r rc = 0.2. As shown in this figure, "Exp."…”

Section: Shear Load-slip Curvesmentioning

confidence: 99%

“…6 Image of the dowel model. b is the bearing stress of concrete, Ms is the full plastic bending moment at the plastic hinge, and t is the tensile stress of the anchor bolt owing to catenary action (Takase 2019;Matsunaga et al 2021Matsunaga et al , 2022.…”

Section: Envelope Curve Of the Roughened Surfacementioning

confidence: 99%

“…Additionally, a simple envelope model was constructed to estimate the mechanical behavior under combined stress (Katagiri et al 2019;Yamada et al 2022). The cyclic model of post-installed anchors was proposed in previous studies (Takase et al 2013(Takase et al , 2018(Takase et al , 2019Matsunaga et al 2021Matsunaga et al , 2022; however, a cyclic model for roughened surfaces has not been proposed yet.…”

Section: Introductionmentioning

confidence: 99%

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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: Shear Load-slip Curvesmentioning

confidence: 99%

Section: Envelope Curve Of the Roughened Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cyclic Behavior of Interfaces for Seismically Retrofitted RC Buildings

Yamada

Takase

Abe

2023

ACT

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“…3, the σb is the bearing stress of concrete, Ms is the full plastic bending moment at the plastic hinge, and σt is the tensile stress of the anchor bolt by a catenary action. [11][12][13][14] The shear force Qd is expressed as follows:…”

Section: Dowel Modelmentioning

confidence: 99%

“…[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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