• Title, Summary, Keyword: 판앵커

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A Study on Anchor Bolt Design Considering Moment due to Base Plate Deformation (모멘트에 의한 베이스판의 변형을 고려한 앵커볼트의 설계방법에 관한 연구)

  • Lee, Dae-Yong
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.620-627
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    • 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.

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Assessment of the Anchor Head System Embedded in the Ground Surface (지표면에 근입한 앵커두부처리 시스템의 적용성 평가)

  • Min, Kyoung-Nam;Bae, Woo-Seok;Ahn, Kwang-Kuk;Jeong, Ku-Sic
    • The Journal of Engineering Geology
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    • v.22 no.1
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    • pp.49-58
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    • 2012
  • Anchor heads a recommonly exposed to surface weathering processes that cause physical damage by vibration and external forces. This study presents a new method of anchor-head installation that uses near-surface embedding based on analyses of concrete block failure. ABAQUS 3D numerical modeling performed to compare this method with the standard technique and to analyze the distribution of displacement and the stress pattern. In addition, application of the method to a real-world case was tested by in-situ measurements. The results show a maximum vertical stress of 9.73 MPa and vertical displacement of 1.34 mm. Field tests indicated that displacement of a concrete block was 3 to 4 times greater than that of an embedded bearing plate.

Analytical and Experimental Studies on Partially Composite of Steel-Plate Girder Bridges Using Slab Anchors (바닥판 앵커를 사용한 플레이트거더교의 부분합성에 관한 해석 및 실험 연구)

  • Han, Sang Yun;Park, Nam Hoi;Yoon, Ki Young;Kang, Young Jong
    • Journal of Korean Society of Steel Construction
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    • v.16 no.3
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    • pp.325-332
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    • 2004
  • Cross sections of steel-plate girder bridges are divided into three cross sections of non-composite, partially composite, and fully composite sections, according to their composite characteristics. The Korean provision for the partially and fully composite sections specifies general usage of the stud of shear connectors, whereas the one for the non-composite section specifies empirical usage of slab anchors. However, the actual behavior of the cross sections of steel-plate girder bridges using slab anchors is close not to the non-composite action, but to the partially composite action. Therefore analytical and experimental studies on partial composites of steel-plate girder bridges using slab anchors are performed in this study. Intial stiffness of the slab anchor is obtained by the experimental study for the first time, and the composite characteristic of simple-span and two-span continuous steel-plate girder bridges is investigated by the finite element analyses for the second time. Based on the obtained initial stiffness, the reduction effect of tensile stresses in the concrete-slab on the intermediate support of the continuous bridge is also considered herein.

Analysis of Ultimate Capacity of Plate Anchor on Loading Rate Capacity in Clay (점토 지반에서 인발속도에 따른 판앵커의 극한 인발저항력 분석)

  • Seo, Young-Kyo;Ryu, Dong-Man
    • Journal of Ocean Engineering and Technology
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    • v.27 no.3
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    • pp.15-21
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    • 2013
  • Anchors are primarily designed and constructed to resist outwardly directed loads imposed on the foundation of a structure. These outwardly directed loads are transmitted to the soil at a greater depth by the anchors. Buried anchors have been used for thousands of years to stabilize structures. Various types of earth anchors are now used for the uplift resistance of transmission towers, utility poles, submerged pipelines, and tunnels. Anchors are also used for the tieback resistance of earth-retaining structures, waterfront structures, at bends in pressure pipelines, and when it is necessary to control thermal stress. In this research, we analyzed the uplift behavior of plate anchors in clay using a laboratory experiment to estimate the uplift behavior of plate anchors under various conditions. To achieve the research purpose, the uplift resistance and displacement characteristics of plate anchors caused by the embedment ratio, plate diameter, and loading rate were studied, compared, and analyzed for various cases.

Robust Motorbike License Plate Detection and Recognition using Image Warping based on YOLOv2 (YOLOv2 기반의 영상 워핑을 이용한 강인한 오토바이 번호판 검출 및 인식)

  • Dang, Xuan Truong;Kim, Eung Tae
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.17-20
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    • 2019
  • 번호판 자동인식 (ALPR: Automatic License Plate Recognition)은 지능형 교통시스템 및 비디오 감시 시스템 등 많은 응용 분야에서 필요한 기술이다. 대부분의 연구는 자동차를 대상으로 번호판 감지 및 인식을 연구하였고, 오토바이를 대상으로 번호판 감지 및 인식은 매우 적은 편이다. 자동차의 경우 번호판이 차량의 전방 또는 후방 중앙에 위치하며 번호판의 뒷배경은 주로 단색으로 덜 복잡한 편이다. 그러나 오토바이의 경우 킥 스탠드를 이용하여 세우기 때문에 주차할 때 오토바이는 다양한 각도로 기울어져 있으므로 번호판의 글자 및 숫자 인식하는 과정이 훨씬 더 복잡하다. 본 논문에서는 다양한 각도로 주차된 오토바이 데이트세트에 대하여 번호판의 문자 인식 정확도를 높이기 위하여 2-스테이지 YOLOv2 알고리즘을 사용하여 오토바이 영역을 선 검출 후 번호판 영역을 검지한다. 인식률을 높이기 위해 앵커박스의 사이즈와 개수를 오토바이 특성에 맞추어 조절하였다. 그 후 기울어진 번호판을 검출한 후 영상 워핑(Image Warping) 알고리즘을 적용하였다. 모의실험 결과, 기존 방식의 인식률이 47,74%에 비해 제안된 방식은 80.23%의 번호판의 인식률을 얻었다. 제안된 방법은 전체적으로 오토바이 번호판 특성에 맞는 앵커박스와 이미지 워핑을 통해서 다양한 기울기의 오토바이 번호판 문자 인식을 높일 수 있었다.

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Creep Effect of Shallow Plate Anchor in Soft Clsy

  • Shin, Eun-Chul;Das, Braja
    • Geotechnical Engineering
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    • v.12 no.3
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    • pp.63-72
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    • 1996
  • Plate anchors are often used for various types of offshore construction and maintenance works. When the plates are embedded in soft clay and subjected to sustanined allowable loads, creep may develop. This paper presents some results from laboratory model test designed to study the creep effect that develops with time for a shallow circular anchor subjected to sustained net loads that are less than the net ultimate uplift capacity. Based on the model test results, relationships among the net load, the rate of strain, and time are developed.

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A Model Test on Uplift Behavior of Plate Anchor (Plate Anchor의 인발거동에 관한 모형실험)

  • Kim, Seo Seong;Lee, Sang Duk;Koo, Ja Kap;Jeon, Mong Gak;Yoo, Keon Seon
    • Journal of The Korean Society of Civil Engineers
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    • v.14 no.5
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    • pp.1219-1227
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    • 1994
  • For Determination of the ultimate uplift capacity, the failure mechanism of the foundation by uplift should be correctly known. However, studies on the variation of the failure mechanism with the embedment ratio of anchor plate among those factors governing the uplift resistance are scarce. In this study. in an attempt to observe more clearly the variation of the failure mechanism with embedment ratio and to check applicability of existing formulae for the ultimate uplift capacity. a model test was performed with ground made of carbon rods, simulating a plane strain conditions. As a result, failure characteristics of shallow and deep anchor conditions were clearly classified. It was found that the analysis of a shallow anchor should be made prior to determination of the ultimate uplift capacity of a deep anchor.

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Robust Motorbike License Plate Detection and Recognition using Image Warping based on YOLOv2 (YOLOv2 기반의 영상워핑을 이용한 강인한 오토바이 번호판 검출 및 인식)

  • Dang, Xuan-Truong;Kim, Eung-Tae
    • Journal of Broadcast Engineering
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    • v.24 no.5
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    • pp.713-725
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    • 2019
  • Automatic License Plate Recognition (ALPR) is a technology required for many applications such as Intelligent Transportation Systems and Video Surveillance Systems. Most of the studies have studied were about the detection and recognition of license plates on cars, and there is very little about detecting and recognizing license plates on motorbikes. In the case of a car, the license plate is located at the front or rear center of the vehicle and is a straight or slightly sloped license plate. Also, the background of the license plate is mainly monochromatic, and license plate detection and recognition process is less complicated. However since the motorbike is parked by using a kickstand, it is inclined at various angles when parked, so the process of recognizing characters on the motorbike license plate is more complicated. In this paper, we have developed a 2-stage YOLOv2 algorithm to detect the area of a license plate after detection of a motorbike area in order to improve the recognition accuracy of license plate for motorbike data set parked at various angles. In order to increase the detection rate, the size and number of the anchor boxes were adjusted according to the characteristics of the motorbike and license plate. Image warping algorithms were applied after detecting tilted license plates. As a result of simulating the license plate character recognition process, the proposed method had the recognition rate of license plate of 80.23% compared to the recognition rate of the conventional method(YOLOv2 without image warping) of 47.74%. Therefore, the proposed method can increase the recognition of tilted motorbike license plate character by using the adjustment of anchor boxes and the image warping which fit the motorbike license plate.