• Title/Summary/Keyword: Tubular Joint

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The Elasto-Plastic Buckling Analysis of Ball-Jointed Single Layer Latticed Domes considering the Characteristics of a Connector (적합부 특성을 고려한 볼 접합 단층 래터스 돔의 탄소성 좌굴해석)

  • Han, Sang-Eul;Kwon, Hyun-Jae;Kim, Jong-Bum
    • Journal of Korean Association for Spatial Structures
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    • v.3 no.2 s.8
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    • pp.91-99
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    • 2003
  • The purpose of this study is to analyze the characteristics of the connector having an influence on the elasto-plastic buckling load of ball-jointed single layer latticed domes. As an analytic model, domes are composed of tubular member elements, balls and connectors. The joint system of members in single layer latticed domes has influence on the buckling load. Therefore, in this paper, the variation of the elasto-plastic buckling load by effects of the connectors characteristics is analyzed. The structural behavior of the connector is investigated by following points: (1) the length of rigid zone, (2) looseness of screw and (3) the diameter of connector. In addition, the elasto-plastic buckling analysis is carried out through the variation of the connectors section of yielding part, and then the buckling mode of the dome is examined. As a result, it is emphasized that the characteristics of the connector have significant effects on the buckling load of latticed domes.

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Characterization of the main component of equal width welded I-beam-to-RHS-column connections

  • Lopez-Colina, Carlos;Serrano, Miguel A.;Lozano, Miguel;Gayarre, Fernando L.;Suarez, Jesus M.;Wilkinson, Tim
    • Steel and Composite Structures
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    • v.32 no.3
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    • pp.337-346
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    • 2019
  • The present paper tries to contribute fill the gap of application of the component method to tubular connections. For this purpose, one typical joint configuration in which just one component can be considered as active has been studied. These joints were selected as symmetrically loaded welded connections in which the beam width was the same as the column width. This focused the study on the component 'side walls of rectangular hollow sections (RHS) in tension/compression'. It should be one of the main components to be considered in welded unstiffened joints between I beams and RHS columns. Many experimental tests on double-sided I-beam-to-RHS-column joint with a width ratio 1 have been carried out by the authors and a finite element (FE) model was validated with their results. Then, some different analytical approaches for the component stiffness and strength have been assessed. Finally, the stiffness proposals have been compared with some FE simulations on I-beam-to-RHS-column joints. This work finally proposes the most adequate equations that were found for the stiffness and strength characterization of the component 'side walls of RHS in tension/compression' to be applied in a further unified global proposal for the application of the component method to RHS.

Experimental investigation on strength of CFRST composite truss girder

  • Yinping Ma;Yongjian Liu;Kun Wang
    • Steel and Composite Structures
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    • v.48 no.6
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    • pp.667-679
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    • 2023
  • Concrete filled rectangular steel tubular (CFRST) composite truss girder is composed of the CFRST truss and concrete slab. The failure mechanism of the girder was different under bending and shear failure modes. The bending and shear strength of the girder were investigated experimentally. The influences of composite effect and shear to span ratio on failure modes of the girder was studied. Results indicated that the top chord and the joint of the truss were strengthened by the composited effect. The failure modes of the specimens were changed from the joint on top chord to the bottom chord. However, the composite effect had limited effect on the failure modes of the girder with small shear to span ratio. The concrete slab and top chord can be regarded as the composite top chord. In this case, the axial force distribution of the girder was close to the pin-jointed truss model. An approach of strength prediction was proposed which can take the composite effect and shear to span ratio into account. The approach gave accurate predictions on the strength of CFRST composite truss girder under different bending and shear failure modes.

Giant Cell Tumor of the Patella (슬개골에 발생한 거대세포종 - 증례보고 -)

  • Hahn, Soo-Bong;Kim, Ju-Young;Shin, Kyu-Ho
    • The Journal of the Korean bone and joint tumor society
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    • v.9 no.2
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    • pp.217-222
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    • 2003
  • The giant cell tumor comprises approximately 5% of all bone tumors especially in the long tubular bones, particularly in proximity to the epiphysis. A rare case of giant cell tumor involving the patella was recently experienced by authors. Case summary with brief review of reference is presented.

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Fatigue Strength and Fracture Behaviour of CHS-to-RHS T-Joints Subjected to Out-of-Plane Bending

  • Bian, Li-Chun;Lim, Jae-Kyoo;Kim, Yon-Jig
    • Journal of Mechanical Science and Technology
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    • v.17 no.2
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    • pp.207-214
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    • 2003
  • The fatigue behaviour of six different hollow section T-joints subjected to out-of-plane bending moment was investigated experimentally using scaled steel models. The joints had circular brace members and rectangular chord members. Hot spot stresses and the stress concentration factors. (SCFs) were determined experimentally. Fatigue testing was carried out under constant amplitude loading in air. The test results have been statistically evaluated, and show that the experimental SCF values for circular-to-rectangular (CHS-to-RHS) hollow section joints were found to be below those of circular-to-circular (CHS-to-CHS) hollow section joints. The fatigue strength, referred to experimental hot spot stress, was in reasonably good agreement with referred fatigue design codes for tubular joints.

A Study on the Spectral Fatigue Analysis for Offshore Structures (해양구조물의 스펙트럴 피로해석에 대한 사찰)

  • Jo, Gyu-Nam
    • Journal of Ocean Engineering and Technology
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    • v.4 no.2
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    • pp.59-72
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    • 1990
  • 본 논문은 해양 구조물에 대한 확률적 기법을 이용한 스펙트럴 피로해석 방법에 대하여 기술하고 있다. 환경조건 특히 파도 및 관련된 해상상태, 파도 스펙트럼에 대하여 조사하였다. 각종 공식을 이용한 응력 집중계수와 유한요소법을 이용한 응력 집중계수 산출 방법 및 피로수명에 대한 그 영향에 대하여 연구하고, S-N선도의 선택과 해상상태의 간략화 문제등에 관해서도 다루었다. 마지막으로 스펙트럴 피로해석 기법을 응용한 실제 피로해석 사례 연구를 통하여 본 방법의 유용성을 입증하였다.

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A Study on the Shear Impact Characteristics of Adhesively Bonded Tubular Joints (접착 조인트의 전단 충격특성에 관한 연구)

  • Kim, Yong-Ha;Park, Sang-Kun;Kim, Dong-Ok;Ryu, Yong-Moon;Cheon, Seong-Sik
    • Composites Research
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    • v.25 no.1
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    • pp.14-18
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    • 2012
  • The structural adhesives have the advantage of improving automobile performances and are being applied to joining light weight materials like aluminium and composite. In order to characterize the impact behavior of structural adhesive, instrumented impact tests were performed with respect to pin-ring adhesively bonded joint specimens. Also dynamic FE analysis was carried out using LS-DYNA to compare the results with experiments.

An Experimental Study on the Bonding Characteristic of Steel Tubular Joint Connection filled with Fiber Reinforced High Performance Cementeous Grout (섬유보강 고성능시멘트계 그라우트가 적용된 강관 연결부의 부착특성에 대한 실험적 연구)

  • Oh, Hong-Seob;Seo, Gyo;Kim, Sang-Hyeon;Ko, Sang-Jin;Lee, Hyeon-Gi
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.18 no.6
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    • pp.21-29
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    • 2014
  • This paper deals with the bonding characteristic of grouted joint connections of monopile support structures for offshore wind power facilities. For the integration of pile connection of wind power supporting structure, fiber reinforced high performance cementeous grout was developed and the ultimate compressive strength of it is 125MPa and the direct tensile strength is 7.5 MPa at 7 days. To assess the bond strength of grout filled in pile connection, small scaled direct bond tests under axially loaded was performed and analyzed according the existing guidelines. The fiber volume fraction (0%, 0.5% and 0.9%), aspect ratio of fiber (60 and 80) and the ratio of height to spacing of shear key (0.013 and 0.056) were adopted as the experimental variables. From the test results, the maximum bond strength among the all specimens was 30.8MPa and the bond strength of grouted connection was affected by the ratio of height to spacing of shear key than the fiber volume fraction.

A component method model for blind-bolts with headed anchors in tension

  • Pitrakkos, Theodoros;Tizani, Walid
    • Steel and Composite Structures
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    • v.18 no.5
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    • pp.1305-1330
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    • 2015
  • The successful application of the component-based approach - widely used to model structural joints - requires knowledge of the mechanical properties of the constitutive joint components, including an appropriate assembly procedure to derive the joint properties. This paper presents a component-method model for a structural joint component that is located in the tension zone of blind-bolted connections to concrete-filled tubular steel profiles. The model relates to the response of blind-bolts with headed anchors under monotonic loading, and the blind-bolt is termed the "Extended Hollo-bolt". Experimental data is used to develop the model, with the data being collected in a manner such that constitutive models were characterised for the principal elements which contribute to the global deformability of the connector. The model, based on a system of spring elements, incorporates pre-load and deformation from various parts of the blind-bolt: (i) the internal bolt elongation; (ii) the connector's expanding sleeves element; and (iii) the connector's mechanical anchorage element. The characteristics of these elements are determined on the basis of piecewise functions, accounting for basic geometrical and mechanical properties such as the strength of the concrete applied to the tube, the connection clamping length, and the size and class of the blind-bolt's internal bolt. An assembly process is then detailed to establish the model for the elastic and inelastic behaviour of the component. Comparisons of model predictions with experimental data show that the proposed model can predict with sufficient accuracy the response of the component. The model furthers the development of a full and detailed design method for an original connection technology.

Behavior of improved through-diaphragm connection to square tubular column under tensile loading

  • Qin, Ying;Zhang, Jing-Chen;Shi, Peng;Chen, Yi-Fu;Xu, Yao-Han;Shi, Zuo-Zheng
    • Structural Engineering and Mechanics
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    • v.68 no.4
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    • pp.475-483
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    • 2018
  • Square tubular columns are commonly used in moment resisting frames, while through-diaphragm connection is the most typical configuration detail to connect the H-shaped beam to the column. However, brittle fracture normally occurs at the complete joint penetration weld between the beam flange and the through-diaphragm due to the stress concentration caused by the geometrical discontinuity. Accordingly, three improved types of through-diaphragm are presented in this paper to provide smooth force flow path comparing to that of conventional connections. Tensile tests were conducted on four specimens and the results were analyzed in terms of failure modes, load-displacement response, yield and ultimate capacity, and initial stiffness. Furthermore, strain distributions on the through-diaphragm, the beam flange plate, and the column face were comprehensively evaluated and discussed. It was found that all the proposed three types of improved through-diaphragm connections were able to reduce the stress concentration in the welds between the beam flange and the through-diaphragm. Furthermore, the stress distribution in connection with longer tapered through-diaphragm was more uniform.