• Title/Summary/Keyword: 조인트

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Static Strength of Cramp Joint at Precast Highway Deck Slabs (프리캐스트 바닥판용 클램프 조인트의 정적내하력)

  • Kim, Yoon-Chil
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.5
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    • pp.187-193
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    • 2006
  • A new jointing method using steel cramps with a unique configuration was developed for the field joint of precast deck slabs of highway bridges. In this jointing method, the looped distribution bars are connected by the cramps to the main reinforcements. Therefore, the joint can transfer the bending moment and shearing force through the interlocking effect caused by the cramps, and it is both excellent in installation on-site and economical compared with the loop joint currently in use. In order to confirm the bending and shear capacities and to clarify the failure mechanism of the joint, a series of static loading tests were carried out. From the results of these experimental studies, it was clarified that the cramp joint has enough load carrying capacity being equivalent to the loop joint.

Human Activity Pattern Recognition Using Motion Information and Joints of Human Body (인체의 조인트와 움직임 정보를 이용한 인간의 행동패턴 인식)

  • Kwak, Nae-Joung;Song, Teuk-Seob
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.6
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    • pp.1179-1186
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    • 2012
  • In this paper, we propose an algorithm that recognizes human activity patterns using the human body's joints and the information of the joints. The proposed method extracts the object from inputted video, automatically extracts joints using the ratio of the human body, applies block-matching algorithm for each joint and gets the motion information of joints. The proposed method uses the joints to move, the directional vector of motions of joints, and the sign to represent the increase or decrease of x and y coordinates of joints as basic parameters for human recognition of activity. The proposed method was tested for 8 human activities of inputted video from a web camera and had the good result for the ration of recognition of the human activities.

Automatic Detecting of Joint of Human Body and Mapping of Human Body using Humanoid Modeling (인체 모델링을 이용한 인체의 조인트 자동 검출 및 인체 매핑)

  • Kwak, Nae-Joung;Song, Teuk-Seob
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.4
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    • pp.851-859
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    • 2011
  • In this paper, we propose the method that automatically extracts the silhouette and the joints of consecutive input image, and track joints to trace object for interaction between human and computer. Also the proposed method presents the action of human being to map human body using joints. To implement the algorithm, we model human body using 14 joints to refer to body size. The proposed method converts RGB color image acquired through a single camera to hue, saturation, value images and extracts body's silhouette using the difference between the background and input. Then we automatically extracts joints using the corner points of the extracted silhouette and the data of body's model. The motion of object is tracted by applying block-matching method to areas around joints among all image and the human's motion is mapped using positions of joints. The proposed method is applied to the test videos and the result shows that the proposed method automatically extracts joints and effectively maps human body by the detected joints. Also the human's action is aptly expressed to reflect locations of the joints

Multi-component Topology Optimization Considering Joint Distance (조인트 최소거리를 고려한 다중구조물 위상최적설계 기법)

  • Jun Hwan, Kim;Gil Ho, Yoon
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.35 no.6
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    • pp.343-349
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    • 2022
  • This paper proposes a new topology optimization scheme to determine optimized joints for multi-component models. The joints are modeled as zero-length high-stiffness spring elements. The spring joints are considered as mesh-independent springs based on a joint-element interpolation scheme. This enables the changing of the location of the joints regardless of the connected nodes during optimization. Because the joints are movable, the locations of the optimized joints should be aggregated at several points. In this paper, the novel joint dispersal (JD) constraint to prevent joint clustering is proposed. With the joint dispersal constraint, it is possible to determine the optimized joint location as well as optimized topologies while maintaining the minimum distance between each joint. The mechanical compliance value is considered as the objective function. Several topology optimization examples are solved to demonstrate the effect of the joint dispersal constraint.

A Study on the strength of the Bolted Joint & Pin Joint with Hole Clearance (원공공차를 가진 볼트 조인트와 핀 조인트의 강도평가에 관한 연구)

  • Jeong, Kang-Woo;Choi, Jin-Ho;Kweon, Jin-Hwe
    • Composites Research
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    • v.25 no.6
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    • pp.186-190
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    • 2012
  • With the wide application of fiber-reinforced composite material in aero-structures and mechanical parts, composite joint have become a very important research area because they are often the weakest sites in composite structures. In this paper, the failure strengths of the bolted joint and pin joint which have variable hole clearance were evaluated and compared. From the tests, the first failure loads of the bolted joint and pin joint with $880{\mu}m$ hole clearance have decreased by 24.2 % and 51.3 % compared to those of joints with $0{\mu}m$ hole clearance, respectively. Also, the failure index of the joints were calculated by the finite element method and compared with experimental results.

Corrosion of Steel Bars in Concrete at Joints under Tidal Environment (조수간만대 환경의 콘크리트 조인트에서 철근의 부식)

  • Lee, Joon-Gu;Park, Kwang-Su;Kim, Myung-Won;Kim, Kwan-Ho
    • Magazine of the Korea Concrete Institute
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    • v.18 no.5 s.94
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    • pp.73-82
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    • 2006
  • 다양한 조인트를 갖도록 제작된 콘크리트 실험체내 철근의 부식에 대한 상세한 조사가 이루어졌다. 실험체들은 25년 동안 조수간만대에 노출되었다. 몇몇 실험체들은 25년 후에 가속챔버내에서 보다 가혹한 열화환경에 노출되었다. 실험항목은 부착강도, 중성화깊이, 염분농도, 부식의 전기화학적, 물리적 측정, 그리고 조인트부 생성물이다. 에폭시나 라텍스 페이스트로 처리된 조인트면을 제외하고 조인트면에 자동생성되는 생성물은 콘크리트 내 철근의 부식을 막는다. 철근과 콘크리트 계면에서의 공극은 국부부식의 주원인이다. 조인트 표면의 레이탄스 제거가 조인트면의 중성화 깊이를 줄인다. 레이턴스 제거 후 모르타르 코팅처리가 라텍스 페이스트나 에폭시코팅처리에 비해 가장 작은 중성화 깊이를 보인다. 레이턴스 제거후 에폭시코팅처리는 가장 강한 부착력을 갖지만 절점부 콘크리트 내 철근부식 방지에는 가장 우수한 성능을 보이지 못한다.

Stress intensities at the interface corner of the co-cured lap joint with composite and steel adherends (복합재료와 강재료를 이용한 동시경화조인트의 계면 모서리에서의 응력집중계수)

  • 신금철;이정주
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2003.04a
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    • pp.83-86
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    • 2003
  • 동시경화조인트는 경화 시 복합재료로부터 흘러나오는 수지를 접착제로 사용하기 때문에 제조과정이 간편할 뿐 아니라 복합재료를 표면 처리할 필요가 없기 때문에 기존의 접착제에 의한 접합방법에 비해 장점을 지닌다. 최근 동시경화조인트에 관한 연구가 활발하게 진행되고 있으나 해석적인 방법을 통한 연구는 아직까지 미비하다. 실험적으로 연구된 결과를 보면 동시경화 조인트는 계면 모서리에서 파괴가 시작되어 계면을 따라 파괴가 진행된다. 그러므로 조인트의 계면 모서리에서의 응력집중계수에 관해 연구하는 것이 중요하다. 본 논문에서는 고유치 문제를 고려하여 복합재료와 강재료로 구성된 동시경화조인트의 계면 모서리에서 발생하는 응력 및 변위장을 결정하고, H-적분을 이용하여 응력집중계수를 구하는 방법을 제시하고자 한다.

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Modeling of 2D Joints Using Contact (접촉을 이용한 2차원 조인트들의 모델링에 관한 연구)

  • Han, Hyung Suk;Park, Tae Won
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.2
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    • pp.92-101
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    • 1997
  • In this paper, modeling methods for 2D joints are proposed. Earlier methods for modeling 2D joints that use geometric relationships may not consider irregularities or dynamic effects of joints. In any case, it is important to consider irregularities or dynamic effects. To consider those, methods that use dynamic contacts are proposed. With the method, 2D joints that have irregularities or dynamic effects amy be model- ed and analyzed. 2D joints that are developed are revolute, translational, gear and point-follower joint.

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자재업체탐방 - '전진화 식 품질 외고집' 스테인리스강 이중링 조인트 시장에 도전장 내밀다 (주)신한메탈

  • 대한기계설비건설협회
    • 월간 기계설비
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    • s.302
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    • pp.78-81
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    • 2015
  • 다이아몬드표 나사식 관이음쇠로 유명한 (주)신한메탈(대표 전진화)이 최근 SH-조인트로 상표등록 하고 스테인리스 강관 조인트 시장에 본격 진출했다. 최근들어 내식성, 내마모성이 뛰어난 스테인리스강 수요가 크게 늘면서 이중링 조인트 사용이 활발해지자 스테인리스 배관 시장변화에 능동적으로 대처하기 위해서다.

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Failure Mode and Strength of Unidirectional Composite Single Lap Bonded Joints I. Experiments (일방향 복합재료 Single Lap접합 조인트의 파손 모드 및 강도 I. 실험)

  • Kim Kwang-Soo;Yoo Jae-Seok;An Jae-Mo;Jang Young-Soon
    • Composites Research
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    • v.17 no.6
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    • pp.14-21
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    • 2004
  • Failure process, mode and strength of unidirectional composite single lap bonded joints were investigated experimentally with respect to bonding methods, those are, co-curing with and without adhesive and secondary bonding. The co-cured joint specimens without adhesive had the largest failure strength. Progressive failures along the adhesive layer occurred in the secondary bonded specimens. In the co-cured specimens with adhesive film which had better material strength and adhesion performance, delamination failure occurred and the joint strengths were less than those of secondary bonded specimens. Delamination failure did not occur in the secondary bonded specimens because of earlier crack growth and progressive failure in the adhesive layer. Therefore, failure strength of composite bonded Joints were not always proportionate to material strength and adhesion performance of the adhesive due to the weakness of delamination in composite materials. The effects of surface roughness, bondline thickness and fillets were also studied on secondary bonded specimens.