• Title/Summary/Keyword: Pin-joint

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Performance Analysis of SMART Frame Applied to Logistics Buildings (물류시설에 SMART Frame 적용시 효용성 분석)

  • Son, Seung-Hyun;Kim, Ki-Ho;Lee, Jun-Ah;Kim, Sun-kuk
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.14-15
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    • 2018
  • Logistics facilities are characterized by wide spans and high flooring, most of which are constructed with PC (Precast Concrete) methods to meet a wide range of commercial and industrial needs. However, the PC structure is a pin joint design, and the construction cost is increased due to the restrictions caused by the installation process, and the construction period is lengthened. In order to solve the above problem, SMART Frame, which is a structural system similar to the steel frame structure, was developed by embedding a steel frame at both ends of the PC. The purpose of this study is to analyze the erection time reduction effect of steel connected precast concrete components (SMART frames) for long span and heavy loaded logistics buildings compared to existing PC frames. For this study, a logistics building constructed with pin joint PC components is selected as a case. The result is compared with the existing PC frame to confirm the erection time reduction effect.

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Effect of Design Shape on Fatigue Life of Plug Welded Joint (플러그 용접이음부의 피로수명에 미치는 설계형상의 영향)

  • 임재규;이중삼;서도원
    • Journal of Welding and Joining
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    • v.17 no.2
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    • pp.29-35
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    • 1999
  • This study was intended to use for the fatigue test in real structures and offer basic data for optimum welding structure design. To this purpose, we obserded the effect of the size and distance of plug welding hole on the static strength and fatigue life of welding structure under the shear/bending load for the improvement of fatigue life of plug welding joint between S/MBR and C/MBR in the lower structure of large bus. The result below is shown through this study. 1) Static and fatigue strength are strongly influenced by the direction of plug weld hole distributed. 2) Distances and diameters of the distributed holes are little dependent on the static strengths 3) In case of the directions of the distributed plug weld holes are vertical to the loading pin, fatigue life is dependent on distance of the distributed hole. 4) In case of the directions of the distributed plug weld holes are parallel to the loading pin, fatigue life is dependent on distance of the hole diameter.

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Novel pin jointed moment connection for cold-formed steel trusses

  • Mathison, Chris;Roy, Krishanu;Clifton, G. Charles;Ahmadi, Amin;Masood, Rehan;Lim, James B.P.
    • Steel and Composite Structures
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    • v.31 no.5
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    • pp.453-467
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    • 2019
  • Portal frame structures, made up of cold-formed steel trusses, are increasingly being used for lightweight building construction. A novel pin-jointed moment connector, called the Howick Rivet Connector (HRC), was developed and tested previously in T-joints and truss assemblage to determine its reliable strength, stiffness and moment resisting capacity. This paper presents an experimental study on the HRC, in moment resisting cold-formed steel trusses. The connection method is devised where intersecting truss members are confined by a gusset connected by HRCs to create a rigid moment connection. In total, three large scale experiments were conducted to determine the elastic capacity and cyclic behaviour of the gusseted truss moment connection comprising HRC connectors. Theoretical failure loads were also calculated and compared against the experimental failure loads. Results show that the HRCs work effectively at carrying high shear loads between the members of the truss, enabling rigid behaviour to be developed and giving elastic behaviour without tilting up to a defined yield point. An extended gusset connection has been proposed to maximize the moment carrying capacity in a truss knee connection using the HRCs, in which they are aligned around the perimeter of the gusset to maximize the moment capacity and to increase the stability of the truss knee joint.

Behavior Pattern Prediction Algorithm Based on 2D Pose Estimation and LSTM from Videos (비디오 영상에서 2차원 자세 추정과 LSTM 기반의 행동 패턴 예측 알고리즘)

  • Choi, Jiho;Hwang, Gyutae;Lee, Sang Jun
    • IEMEK Journal of Embedded Systems and Applications
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    • v.17 no.4
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    • pp.191-197
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    • 2022
  • This study proposes an image-based Pose Intention Network (PIN) algorithm for rehabilitation via patients' intentions. The purpose of the PIN algorithm is for enabling an active rehabilitation exercise, which is implemented by estimating the patient's motion and classifying the intention. Existing rehabilitation involves the inconvenience of attaching a sensor directly to the patient's skin. In addition, the rehabilitation device moves the patient, which is a passive rehabilitation method. Our algorithm consists of two steps. First, we estimate the user's joint position through the OpenPose algorithm, which is efficient in estimating 2D human pose in an image. Second, an intention classifier is constructed for classifying the motions into three categories, and a sequence of images including joint information is used as input. The intention network also learns correlations between joints and changes in joints over a short period of time, which can be easily used to determine the intention of the motion. To implement the proposed algorithm and conduct real-world experiments, we collected our own dataset, which is composed of videos of three classes. The network is trained using short segment clips of the video. Experimental results demonstrate that the proposed algorithm is effective for classifying intentions based on a short video clip.

A study on the strength of mechanically fastened composite joint using the linear analysis (선형해석을 이용한 복합재료 기계적 체결부의 강도평가에 관한 연구)

  • Chun, Young-Jun;Choi, Jin-Ho;Kweon, Jin-Hwe;Lee, Sang-Chan
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.9
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    • pp.49-56
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    • 2004
  • With the wide application of fiber-reinforced composite material in aero-structures and mechanical parts, the design of composite joint have become a very important research area because they are often the weakest areas in composite structures. In this paper, the linear finite element analyses in which the pin of the composite joint was assumed to be the frictionless rigid body were performed and predict the strength of the mechanically fastened composite joint using the failure area index method. By the failure area index method, the strength of the mechanically fastened composite joint which has the specimen of different shape, hole size and stacking sequence could be predicted within 12.2%.

A Study of Nonlinear Unstable Phenomenon of Framed Space Structures Considering Joint Rigidity (절점 강성을 고려한 공간 구조물의 비선형 불안정 거동에 관한 연구)

  • Shon, Su-Deok;Kim, Seung-Deog;Hwang, Kyung-Ju;Kang, Moon-Myung
    • Journal of Korean Association for Spatial Structures
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    • v.3 no.1 s.7
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    • pp.87-97
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    • 2003
  • The structural system that discreterized from continuous shells is frequently used to make a large space structures. As well these structures show the unstable phenomena when a load level over the limit load, and snap-through and bifurcation are most well known of it. For the collapse mechanism, rise-span ratio, element stiffness and load mode are main factor, which it give an effect to unstable behavior. In our real situation, most structures have semi-rigid joint that has middle characteristic between pin and rigid joint. So the knowledge of semi-rigid joint is very important problem of stable large space structure. And the instability phenemena of framed space structures show a strong non-linearity and very sensitive behavior according to the joint rigidity For this reason In this study, we are investigating to unstable problem of framed structure with semi-rigidity and to grasp the nonlinear instability behavior that make the fundamental collapse mechanism of the large space frame structures with semi-rigid joint, by proposed the numerical analysis method. Using the incremental stiffness matrix in chapter 2, we study instability of space structures.

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Moment Resistance Performance of Each Joint for Post-Beam Frame Structure (기둥-보 뼈대구조를 위한 각부 접합부의 모멘트저항성능)

  • Park, Joo-Saeng;Hwang, Kweon-Hwan
    • Journal of the Korean Wood Science and Technology
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    • v.39 no.1
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    • pp.8-14
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    • 2011
  • Japanese larch glulam was used as structural members to develop a modern engineered wood jointing system using traditional post and beam structure. For the connections comprised of traditional joining and drift-pins, structural members are processed at a pre-cut factory. As a basic study to examine and increase the whole shear performance of portal frame, pin withdrawal test and moment resistance tests were conducted on each connection. The post and beam members with specified connectors showed good bearing performance in the wood members' joining system, column-base and beam-end. Moment rigidity was a bit better in a joint with higher slenderness ratio of drift-pin, but moment resistance performances, yield moment and maximum moment, were excellent in smaller one.

Open Reduction of Acromioclavicular Joint for the Acromioclavicular Joint Dislocations (견봉 쇄골 관절 탈구에 대한 견봉 쇄골 관절의 관혈적 정복술)

  • Song, Hyun-Seok;Choi, Nam-Yong;Han, Suk-Ku;Nah, Ki-Ho;Nam, Won-Sik;Yang, Hyuk-Jae;Park, Sung-Jin
    • Clinics in Shoulder and Elbow
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    • v.9 no.2
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    • pp.189-195
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    • 2006
  • Purpose: To analyze the result of the accurate open reduction of acromioclavicular (AC) joint and pin fixation, coracoclavicular (CC) screw fixation without CC ligament repair for AC joint injuries. Materials and Methods: Between January 2000 and December 2003, seventeen cases with at least one year follow-up among twenty-one cases underwent operation for AC-CC ligament injuries. A transverse incision approximately 5 cm in length was made over the clavicle, and the AC joint was reduced accurately. Under the image intensifier, a cannulated screw and washer were inserted for the CC ligament. Two Steinman pins were inserted for the AC joint and the AC ligament was repaired with nonabsorbable suture. Gentle passive range of motion was begun postoperative 2 weeks. The pins were removed at $6{\sim}8$ weeks and the screw was removed at $10{\sim}12$ weeks. The results were evaluated by a distance between AC and CC joints on plain films and ASES score at last follow-up. Results: At the last follow-up, there was no limitation of motion and average ASES score was 96($86{\sim}100$ points). There was no failure showing over 5 mm difference of distance compared to opposite side on the plain films. Seven cases had the skin damages and local infection due to pin migration and three cases showed the loosening of CC screw. Conclusion: We could have satisfactory results by accurate reduction of AC joint and simple pins and screw fixation for AC-CC ligament injuries.

Fatigue Strength of Composite Joint Structures Reinforced by Jagged Shaped Stainless Steel Z-pins (요철 형상의 스테인레스강 Z-핀으로 보강된 복합재 접합 구조물의 피로강도)

  • Choi, Ik-Hyeon;Lim, Cheol-Ho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.12
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    • pp.967-974
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    • 2013
  • Recently the authors had proposed the z-pinning patch concept to simply manufacture z-pinned composite structures at industrial production site and manufactured composite single-lap shear joint specimens using the concept. Through static tensile test on the specimens they had obtained 54~68% improvement of the joint strength. As a sequential study of it, in this study, fatigue test has performed to measure an improvement of joint strength under cyclic loading. The z-pin's material is stainless steel and its surface was specially machined into zagged shapes and chemically corroded to increase the connection force with composite materials. Approximately 98~125% improvement of the joint strength under cyclic loading was obtained.

Performance Evaluation for Bending Strength and Tensile Type Shear Strength of GFRP Reinforced Laminated Wooden Pin (GFRP보강적층목재핀의 휨강도 및 인장형 전단내력 성능평가)

  • Song, Yo-Jin;Jung, Hong-Ju;Kim, Dae-Gil;Kim, Sang-Il;Hong, Soon-Il
    • Journal of the Korean Wood Science and Technology
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    • v.42 no.3
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    • pp.258-265
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    • 2014
  • By replacing the previous metal connector on the joints of timber structure, the GFRP reinforced laminated wooden pin was produced using a wooden material and Glass fiber reinforced plastic(GFRP) composite laminate. In addition, using the reinforced wooden pin, the tensile type shear strength test was conducted. Based on the result of the bending strength test of the reinforced laminated wooden pin according to the GFRP arrangement, a specimen(Type-A) with a single insertion of GFRP for each layer have shown the most favorable performance. Also, it was verified that densified specimen hot pressed for an hour at the temperature of $150^{\circ}C$ and with the oppression pressure $1.96N/mm^2$ have shown the improved performance of 1.57 times than the specimen without the densification. And in the bending strength test considering the load direction, edgewise have shown a higher performance of 3.51 times than the flatwise. A shear strength test was conducted using the Type-A reinforced laminated wooden pin which have shown a moderate performance on the test. Based on the test conducted by differentiating the type of the joint plate and the connector, compared to the specimen(Type-DS) applied with the drift pin and steel plate, the specimen( Type-WL) applied with the GFRP reinforced laminated wooden pin and GFRP reinforced wooden laminated plate have shown 1.12 times higher shear strength and also have shown an excellent toughness even after the maximum load.