• Proceedings of the Earthquake Engineering Society of Korea Conference
• /
• 2006.03a
• /
• pp.620-627
• /
• 2006

강재기둥으로부터 전달되어 내려오는 모멘트 하중에 의한 베이스판의 변형을 고려한 앵커볼트의 설계방법에 대해 소개하였다. 기둥-베이스판 접합부의 설계를 위해 간략해석 모델 (Simple Beam Model) 이 개발되었으며 인장력과 모멘트 하중에 동시에 저항하는 앵커볼트의 설계를 위해 국부 메카니즘 개념이 도입되었다. 제안된 새로운 설계법을 적용하여 앵커볼트와 베이스판 사이의 최대지압력을 계산할 수 있었으며 이를 바탕으로 앵커볼트의 사이즈를 결정할 수 있었다. 본 논문에서는 상기 간략히 소개된 앵커볼트 설계법을 보다 상세히 기술하였다.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.26 no.4
• /
• pp.293-300
• /
• 2013

In this study we proposed a simplified finite element model of anchor bolt system inserted through concrete structures considering clamping forces. The three different finite element types using LS-DYNA are applied for numerical efficiency of the anchor bolt modeling. Combined beam and solid elements are used to reflect the tension state at internal part of anchor bolt due to torques. The clamping forces due to torques are considered by introducing a compression for a nut plane modeled by beam elements. The numerical examples show good agreement with different element types. Parametric studies are focused on the various effects of different element types on the induced axial and shear forces of anchor bolts considering clamping forces.

• ETRI Journal
• /
• v.8 no.4
• /
• pp.124-132
• /
• 1986

본고는 신뢰도상에서 점차 중요시 되어가고 있는 전자통신 장비의 기구물 및 시설의 안정성에 관한 논문으로서 TDX-1 전자교환기를 현장에 설치할 때 시스팀을 고정한 앵커볼트 결합체(앵커볼트+콘크리트 바닥) 에 대한 것이다. 이 앵커볼트 결합체에 하중이 가해졌을 경우 어떤 식으로 파괴가 일어나며, 어느 정도의 하중에서 파괴가 일어나는 가를 수치적 해석과 실험적인 방법으로 산출하여 그 안정성을 입증하였다.

• Journal of Korean Society of Steel Construction
• /
• v.23 no.4
• /
• pp.493-501
• /
• 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.

• Journal of Korean Society of Disaster and Security
• /
• v.15 no.4
• /
• pp.11-20
• /
• 2022

The general non-destructive inspection method for anchor bolts in Korea applies visual inspection and hammering inspection, but it is difficult to check corrosion or fatigue cracks of anchor bolts in the part included in the foundation or in the part where the nut and base plate are installed. In reality, objective investigation is difficult because inspection is affected by the surrounding environment and individual differences, so it is necessary to develop non-destructive inspection technology that can quantitatively estimate these defects. Inspection of the anchor bolts of domestic road facilities is carried out by visual inspection, and since the importance of anchor bolts such as bridge bearings and fall prevention facilities is high, the life span of bridges is extended through preventive maintenance by developing non-destructive testing technology along with existing inspection methods. Through the development of this technology, non-destructive testing of anchor bolts is performed and as a technology capable of preemptive/active maintenance of anchor bolts for road facilities, practical use is urgently needed. In this paper, the possibility of detecting defects in anchor bolts such as corrosion and cracks and reliability were experimentally verified by applying the ultrasonic test among non-destructive inspection techniques. When the technology development is completed, it is expected that it will be possible to realize preemptive/active maintenance of anchor bolts by securing source technology for improving inspection reliability.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.11
• /
• pp.250-258
• /
• 2019

The seismic performance and stability of operating facilities installed in domestic power plants need to be verified because of the increased incidence of earthquakes resulting in power plant damage due to the overturning failure of electric operating facilities. In this study, a structural performance evaluation of the anchor bolts constructed to setup the operating facilities on concrete slabs was carried out through an on-site inspection of power plants, called Daechung-Dam. M10 J hook and M12 J hook anchor bolts were installed in the field unit. According to the ASTM E 488-96 specifications, anchor bolt pullout and shear tests were carried out and compared with the anchor-bolt design standards. The results from the tension and shear pullout tests showed that the M10 and M12 J hook anchor bolts had higher performance than the required design load. Thus, they were found to be safe enough. Nevertheless, more research in the field of analytical study will be needed in the near future.

• Journal of Korean Society of Steel Construction
• /
• v.24 no.2
• /
• pp.207-215
• /
• 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.

• 한국방재학회:학술대회논문집
• /
• 2011.02a
• /
• pp.156-156
• /
• 2011

중량물 혹은 철골구조물 등을 고정시키는데, 건축구조물의 철골기둥, 터빈 제네레이터 기기등을 콘크리트 구조물에 부착시키기 위해 널리 쓰인다. 1990년대 들어 국내 건물의 리모델링, 보수 및 유지관리의 증가에 따라 앵커의 사용량도 현저히 증가하고 있으나 대부분 고가의 외국산제품을 수입하고 있다. 현재 국내외에 주로 시행되는 앵커타입은 마찰형 앵커이나 마찰형 앵커와 달리 지압형 앵커의 경우, 외국에서는 이미 그 유효성에 대한 인식이 널리 퍼져있으며 각국의 지반조건에 적합한 설계법이 개발되었다. 그러나 국내의 경우 이러한 연구가 미진한 실정이며 이에 대한 연구가 절실한 상황이다. 본 연구에서는 중량물앵커(Heavy Duty Anchor)의 인장시험을 실시하여 내력을 규명하고 도출한 결과를 기존 시험연구 결과와 비교분석하여 기 제안된 이론식들과 사업경제성에대해 보다 깊이있고 정확한 적용성을 입증하는데 본 연구를 수행하였다. 시험을 통한 저강도 파괴시험의 결과 구조부재의 접합부에서 각 시험체마다 뽑힘파괴가 발생하였으며, 뽑힘파괴가 발생한 시험체는 앵커강재의 파괴력 또는 콘크리트의 콘파괴를 발생시키기에는 앵커슬리브의 확장력이 작게 작용되었다. 그 결과, 콘파괴 대신 구조부재의 접합부에서 뽑힘파괴가 발생되었으며 이를 통해 설계시, 앵커의 안정성을 증가시키기 위해 구조부재의 접합부를 연성적이며, 부가여력을 충분히 지니도록 설계하는 것이 효과적인 것으로 나타났다. 고강도 파괴시험의 결과 콘파괴가 발생되었음을 알 수 있는데, 본 시험에 사용된 앵커의 경우 정착위치가 구조물의 연단 모서리 거리와 너무 근접하여 앵커의 내력이 감소하게 되어 콘크리트의 콘강도가 발생되기 전에 먼저 파괴되었다. 따라서 설계시, 앵커의 파괴강도를 증가시키기 위해 앵커의 정착위치를 고려한 설치를 통해 앵커체결과정에서 적정 연단거리를 확보하는 것이 효과적인 것으로 나타났다. 앵커볼트 최소간격과 연단거리에 따른 파괴시험결과 앵커볼트의 간격이 허용범위 내에서 넓어질수록 불균등 부반력의 차는 감소하였으며, 최대 부반력도 감소하였다. 따라서 앵커의 파괴저항강도를 증가시키기 위해서는 허용범위 내에서 앵커볼트의 설치간격을 증가시키는 것이 효과적인 것으로 나타났다.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.29 no.5
• /
• pp.483-490
• /
• 2016

In plant industry, sulfur storage tank is made of steel and annular plate is connected with concrete foundation of ring wall type by anchor bolt. Due to keep sulfur at high temperature in tank by coil, sulfur storage tank is expanded larger than another tank stores fluid at room temperature. Generally, structural design of tank foundation is performed analysis with loading of temperature gradient between inner and outer surface, this method can't consider the phenomenon that load is intensively transferred to concrete foundation at anchor bolt. This means that temperature load is underestimated and causes crack of concrete near anchor bolt. In this study, evaluation formula considering temperature load transfer mechanism through anchor bolt is proposed and load acting on concrete foundation is rationally decided. For this purpose, it is analyzed variation of thermal load per various anchor bolt number using finite element model including tank annular plate and anchor bolt. Solution is proposed as specified term combining result of analysis and theoretical solution for evaluating load transferred by anchor bolt. For confirmation of validation of proposed formula, it is applied in design of sulfur storage tank at plant site, it shows that the formula can be practically applied.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.15 no.5
• /
• pp.82-91
• /
• 2011

In this study, 24 prototype specimens were tested to find out the shear behavior and strength of large anchorage system exceeding 50mm(2") in anchor bolt diameter($d_0$) and 635mm(25") in effective embedment depth($h_{ef}$) not addressed by ACI349-06 Appendix B. Test variables are anchor bolt diameter($d_0$ = 63.5, 76.2, 88.9mm), effective embedment depth($h_{ef}$=635, 762mm), and edge distance($c_1$=381, 508, 762mm). Concrete compressive strength is constant($f_{ck}$=38MPa). Test results ($V_{test}$) were overestimated by $V_{aci06}$(shear strength by ACI 349-06) and $V_{ccd}$(shear strength by CCD method). In large anchorage system exceeding 50mm(2") of anchor bolt diameter($d_0$) and 635mm(25") of anchor bolt effective embedment depth($h_{ef}$), the bolt diameter variation and effective embedment depth($h_{ef}$) has no influence on the shear strenth, But, according to the analysis results of the feature ratio on edge distance($c_1$) and anchor bolt diameter, the feature ratio become smaller, which means anchor bolt diameter is bigger, predicted ratio of test results and predicted equation is larger. It was found that anchor bolt diameter is immediate cause of deterioration in the shear capacity of large anchorage system. To improve and extend the validity of current design recommendations further theoretical and numerical work is needed.