Static Shear Strength of Cast-in Anchors with Stirrup Reinforcement

Park, Yong Myung; Jo, Sung Hoon; Kim, Tae Hyung; Kang, Choong Hyun; Kim, Jae Bong

doi:10.7781/kjoss.2016.28.1.001

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Few studies have been conducted on anchors reinforced by a straight reinforcement commonly used in construction, while there are some experimental studies on the hairpin 58 . A bridge bearing anchor adopts the method of stirrup reinforcement, which extends to the substructure reinforcement.…”

Section: Resultsmentioning

confidence: 99%

Shear behavior of single cast-in anchor simulating characteristics of bridge bearing anchor

Choi

Chin

Yuan

et al. 2022

Sci Rep

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A bridge bearing anchor transmits various loads of a superstructure to a substructure. Most anchors are generally designed without consideration of characteristics such as concrete pedestal, grout bedding, and anchor socket. This study investigated the shear behavior of anchors in accordance with the edge distance, embedment depth, compressive strength of concrete, and height of the concrete pedestal in order to simulate the practical characteristics of the bridge bearing anchors. The actual shear capacity of the anchor differs from the shear strengths calculated by the ACI 318 and EN 1992-4; especially, the importance of the embedment depth is underestimated in these codes. An increase in the height of the concrete pedestal has a negative effect on the shear capacity because of the stress concentration. The grout is fractured prior to the occurrence of local damages in concrete, resulting in a secondary moment. As a result, the effect of the level arm is observed. An equation, which can predict the relative cracking degree of concrete, is proposed by analyzing the displacement of grout and concrete. High strain occurs in the stirrups close to the anchor, and the behavior of the strain is more influenced by the embedment depth than the edge distance. The comparison of obtained and analytically evaluated failure loads by calculations according to EN 1992-4, Schmid model and Sharma model was conducted to consider the effect of supplementary reinforcement. Finally, the design equation of concrete breakout strength is modified to predict the more precise shear resistance of a bridge bearing anchor.

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Section: Resultsmentioning

confidence: 99%

Shear behavior of single cast-in anchor simulating characteristics of bridge bearing anchor

Choi

Chin

Yuan

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Few studies have been conducted on anchors reinforced by stirrup reinforcement commonly used in construction, while there are some experimental studies on the hairpin [52]. A bridge bearing anchor adopts the method of stirrup reinforcement, which extends to the substructure reinforcement.…”

Section: Strain Behavior Of Anchor Reinforcementmentioning

confidence: 99%

Shear Behavior of Single Cast-in Anchor Simulating Characteristics of Bridge Bearing Anchor

Choi¹,

Chin

Yuan³

et al. 2021

Preprint

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A bridge bearing anchor transmits various loads of a superstructure to a substructure. However, most anchors are generally designed without consideration of characteristics such as concrete pedestal, grout bedding, and anchor socket. Therefore, this study investigated the shear behavior of anchors in accordance with the edge distance, embedment depth, compressive strength of concrete, and height of the concrete pedestal in order to simulate the practical characteristics of the bridge bearing anchors. The actual shear capacity of the anchor differs from the shear strength calculated by the ACI 318 Code; especially, the importance of the embedment depth is underestimated in the code. An increase in the height of the concrete pedestal has a negative effect on the shear capacity because of the stress concentration. The grout is fractured prior to the occurrence of local damages in concrete, resulting in a secondary moment. As a result, the effect of the level arm is observed. An equation, which can predict the relative cracking degree of concrete, is proposed by analyzing the displacement of grout and concrete. High strain occurs in the stirrups close to the anchor, and the behavior of the strain is more influenced by the embedment depth than the edge distance. Finally, the design equation of concrete breakout strength is modified to predict the more precise shear resistance of a bridge bearing anchor.

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Breakout shear strength of cast-in-place anchors using shaking table tests

Park

Kim

et al. 2017

Proceedings of the Institution of Civil Engineers - Structures

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The concrete breakout shear strength of stirrup-reinforced cast-in-place anchors during earthquakes was experimentally evaluated. Uncracked and cracked concrete specimens were manufactured using M36 anchors reinforced with D10 stirrups (spacing, 100 mm; edge distance, 180 mm). Shaking table tests were performed to assess the dynamic strength of the reinforced anchors using the Northridge seismic wave. The experimental results showed that the dynamic shear resistance was slightly higher than the static shear resistance due to the strain rate effect of the material. In addition, Etag 001, which is based on the resistance of concrete, and ACI 318, which accounts for the resistance of concrete or steel reinforcement to evaluate the strength of the reinforced anchors, yielded conservative values for the static and dynamic shear strengths of the stirrup-reinforced anchors. An appropriate method that can account for both concrete and stirrup resistance to evaluate the design shear strength of stirrup-reinforced anchors under earthquakes is proposed.

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Static Shear Strength of Cast-in Anchors with Stirrup Reinforcement

Cited by 3 publications

References 4 publications

Shear behavior of single cast-in anchor simulating characteristics of bridge bearing anchor

Shear behavior of single cast-in anchor simulating characteristics of bridge bearing anchor

Shear Behavior of Single Cast-in Anchor Simulating Characteristics of Bridge Bearing Anchor

Breakout shear strength of cast-in-place anchors using shaking table tests

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