• Title/Summary/Keyword: Cast-in anchor

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Tensile Design Criteria Evaluation of Cast-In-Place Anchor by Numerical Analysis (수치해석에 의한 직매형 앵커기초의 인장 설계기준 평가)

  • 장정범;서용표;이종림
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2004.04a
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    • pp.209-216
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    • 2004
  • Numerical analysis is carried out to identify the appropriateness of the design codes that is available for the tensile design of fastening system at Nuclear Power Plant (NPP) in this study. This study is intended for the cast-in-place anchor that is widely used for the fastening of equipment in Korean NPPs. The microplane model and the elastic-perfectly plastic model are employed for the quasi-brittle material like concrete and for the ductile material like anchor bolt as constitutive model for numerical analysis and smeared crack model is employed for the crack and damage phenomena. The developed numerical model is verified on a basis of the various test data of cast-in-place anchor. The appropriateness of both ACI 349 Code and CCD approach of CEB-FIP Code is evaluated for the tensile design of cast-in-place anchor and it is proved that both design codes give a conservative results compared with real tensile capacity of cast-in-place anchor.

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An Evaluation of Tensile Design Criteria of Cast-In-Place Anchor by Numerical Analysis (수치해석에 의한 직매형 앵커기초의 인장설계기준 평가)

  • Suh Yong-Pyo;Jang Jung-Bum
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.18 no.3
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    • pp.303-309
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    • 2005
  • Numerical analysis is carried out to identify the appropriateness of the design codes that is available for the tensile design of fastening system at Nuclear Power Plant (NPP) in this study. This study is intended for the cast-in-place anchor that is widely used for the fastening of equipment in Korean NPPs. The microplane model and the elastic-perfectly plastic model are employed for the quasi-brittle material like concrete and for the ductile material like anchor bolt as constitutive model for numerical analysis and smeared crack model is employed to simulate the clack and damage phenomena. The developed numerical model is verified on a basis of the various test data of cast-in-place anchor. The appropriateness of both ACI 349 Code and CEB-FIP Code is evaluated for the tensile design of cast-in-place anchor and it is proved that both design codes give a conservative results for real tensile capacity of cast-in-place anchor.

Ultimate Uplift Capacity of Permanent Anchor Embedded in Weathered Rock (풍화암에 근입된 영구 앵커의 극한인발력)

  • Yoo, Nam-Jae;Park, Byung-Soo;Jeong, Gil-Soo;Kim, Jin-Hwang
    • Journal of Industrial Technology
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    • v.21 no.B
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    • pp.195-203
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    • 2001
  • The purpose of this study is to estimate ultimate uplift capacity of permanent anchor which was cast into weathered rock. The ultimate uplift capacity was estimated from the load-displacement curve of four different anchors which have different bond length. The creep test was performed for 15minutes under the maximum load of each step in order to understand the load-transfer property of permanent anchor and to decide which anchor to choose. The destruction range of soil due to the changes in load was estimated by installing dial gauge on the ground which was cast into the weathered rock. Ultimately, the study on the behavior of the anchor case into the weathered rock was performed by comparing and analyzing the estimated result of the UUC obtained by the full scale pull out test in the field with the exsting theoretical and practical results of soil and rock anchor.

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Tensile and Shear Strengths of New Type of Cast-in-Place Concrete Insert Anchors Under Monotonic Loading (새로운 형태의 선설치 인서트 앵커에 대한 단조 인장 및 전단강도 평가)

  • Jeon, Ju-Seong;Kim, Ji-Hoon;Oh, Chang-Soo;Lee, Chang-Hwan
    • Journal of Korean Association for Spatial Structures
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    • v.21 no.2
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    • pp.49-56
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    • 2021
  • The damage to non-structural elements in buildings has been increasing due to earthquakes. In Korea, post-installed anchors produced overseas have been mainly used for seismic anchorage of non-structural components to structures. Recently, a new cast-in-place concrete insert anchor installed in concrete without drilling has been developed in Korea. In this paper, an experimental study was conducted to evaluate the tensile and shear strengths of the newly developed anchor under monotonic load. The failure modes of the tension specimens were divided into concrete breakout failure and steel failure, and all shear specimens showed steel failure. In both tension and shear, the maximum loads of specimens were greater than the nominal strengths predicted by the concrete design code (KDS 14 20 54). As a result, it is expected that the current code can also be used to calculate the strength of the developed cast-in anchor.

Dynamic shear strength of unreinforced and Hairpin-reinforced cast-in-place anchors using shaking table tests

  • Kim, Dong Hyun;Park, Yong Myung;Kang, Choong Hyun;Lee, Jong Han
    • Structural Engineering and Mechanics
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    • v.58 no.1
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    • pp.39-58
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    • 2016
  • Since the publication of ACI 318-02, the concrete capacity design (CCD) method has been used to determine the resistance of unreinforced concrete anchors. The regulation of steel-reinforced anchors was proposed in ACI 318-08. Until ACI 318-08, the shear resistance of concrete breakout for an unreinforced anchor during an earthquake was reduced to 75% of the static shear strength, but this reduction has been eliminated since ACI 318-11. In addition, the resistance of a hairpin-reinforced anchor was calculated using only the strength of the steel, and a regulation on the dynamic strength was not given for reinforced anchors. In this study, shaking table tests were performed to evaluate the dynamic shear strength of unreinforced and hairpin-reinforced cast-in-place (CIP) anchors during earthquakes. The anchors used in this study were 30 mm in diameter, with edge distances of 150 mm and embedment depths of 240 mm. The diameter of the hairpin steel was 10 mm. Shaking table tests were carried out on two specimens using the artificial earthquake, based on the United States Nuclear Regulatory Commission (US NRC)'s Regulatory Guide 1.60, and the Northridge earthquake. The experimental results were compared to the current ACI 318 and ETAG 001 design codes.

Pull-out Capacity of Cast-in-place Anchor for Construction of Precast Concrete Segment Arch (프리캐스트 콘크리트 패널 분절 아치 시공을 위한 선설치 앵커의 인발 강도 평가)

  • Ahn, Jin-Hee;Yim, Hong Jae;Bang, Jin Soo;Jeon, Seok Hyeon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.24 no.2
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    • pp.94-102
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    • 2020
  • Precast concrete segment arch system has an economic and construct ability that combined with advantage of precast concrete and arch behavior. A precast concrete segment arch system with outrigger is consisted of segmented precast panels, a steel outrigger rib, and V-strip to connect precast panels with a steel outrigger rib and cast-in-place anchors in precast panels to connect V-strip should have sufficient pull-out capacity to form its arch shape by site lifting for assembled precast panels and outriggers. However, it is difficult to secure its embedment depth due to the relatively shallow thickness of precast panel. It can be also occurred that flexure deformation of precast panels caused by its pull-out behaviors. In this study, pull-out capacity of cast-in-place anchor was examined for construction of precast concrete segment arch system with outriggers. Therefore, a total of 24 precast panel specimens were fabricated to examine pull-out capacities of cast-in-place anchor in precast panels, and installation depth of anchors, diameter of anchors and wire mesh effects for the precast panel were examined. From this pull-out tests, its pull-out capacities and failure modes were evaluated and the type of the cast-in-place anchor applicable to the precast concrete segment panel arch system with outriggers was determined from comparison of the design specification values.

Study on Reinforcing Method of Equipment Foundation System (기기기초 시스템의 보강방안에 대한 연구)

  • 송영철;최홍식;조명석;우상균;이시우;이성태
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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    • pp.367-370
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    • 2003
  • This study was carried out to suggest the effective reinforcing method which can evaluate the tensile capacity of cast-in-place anchor with cracks. Currently, cast-in-place anchor is used widely for the fastening of equipment in Korean NPPs. 26 test specimens with a single anchor under 4 cracked conditions are prepared using plain concrete. The distance between crack and anchor and reinforcing materials were selected as the main test variable. The tensile force was applied using a actuator with a capacity of 100 tonf using a displacement control method of 0.5 mm/min velocity. Test results from this result show the combination of carbon plate and epoxy will be more available for repair and reinforcement of equipment foundation system in NPPs. Further experimental work is indeed involving the epoxy injection effect and adjustment of reinforcing location of carbon sheet.

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A Study on the Concrete Breakout Capacity of CIP Anchor Bolts under Shear Loading (전단력을 받는 선설치 앵커볼트의 콘크리트 파열파괴강도 평가 연구)

  • Park, Yong-Myung;Jeon, Myeong-Hui;Choi, Myung-Kuk;Kim, Cheol-Hwan;Kim, In-Gi
    • Journal of Korean Society of Steel Construction
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    • v.24 no.2
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    • pp.207-215
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    • 2012
  • The 45-degree cone failure theory has been used in concrete anchor bolts design under shear loading, but the CCD (Concrete Capacity Design) method was adopted as a new design method since 2000. However, the method was allowed only for anchor diameters of less than 50mm because it is based on the experimental results of small size anchor bolts. Therefore, it is necessary to develop a rational concrete breakout capacity equation for medium-to-large size anchor bolts with large edge distance. In this study, shear tests on M56 cast-in-place single anchor bolt with edge distance of 350mm were performed using four test specimens. Based on the test results and findings of existing studies, a new equation for the breakout capacity of anchor bolts under shear loading with edge distance of up to 750mm was proposed.

A Study on the Concrete Breakout Capacity Evaluation of Medium-to-Large size CIP Anchor Bolts under Tension Loading (인장하중을 받는 중대형급 선설치 앵커볼트의 콘크리트파괴강도 평가를 위한 연구)

  • Park, Yong-Myung;Jeon, Myeong-Hui;Lee, Kun-Jun;Kim, Cheol-Hwan
    • Journal of Korean Society of Steel Construction
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    • v.23 no.4
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    • pp.493-501
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    • 2011
  • The $45^{\circ}$cone failure theory has been used for concrete anchor bolt design, but the CCD (concrete capacity design) method was adopted as a new design method in 2000. The method was allowed to be used, however, only for anchors with a diameter of less than 50 mm and an embedment depth of less than 635 mm because it is based on the experiment results from medium-sized to small anchor bolts. Therefore, it is necessary to develop a rational concrete breakout capacity equation for medium-sized to large anchor bolts. In this study, tension tests on an M56 cast-in-place single anchor bolt with an effective embedment depth of 400-450 mm were carried out for the five test specimens. Based on the test results together with the other recent test results, the applicability of the concrete breakout capacity equation in the current design code to the large to medium-sized anchor bolts with an embedment depth of 280-1,200 mm was estimated.