• Title/Summary/Keyword: 연결부

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Global Sensitivity Analysis of Joints for Plug-in Digital Framework (플러그인 디지털 프레임웍을 위한 연결부 전역민감도 해석)

  • Lee, Dooho;Won, Young-Woo;Kwon, Jong-Hyun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.5
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    • pp.483-488
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    • 2016
  • Plug-In Digital Framework is a system response analysis tool that is employed when system components are composed of black-box modules. Generally, the dynamic characteristics of joints between the system components significantly affect system responses, and they lead to displacement- and frequency-dependent stiffness and loss factor. Thus, the sensitivity of each joint parameters should be estimated from a global perspective. In this study, we introduce a global sensitivity analysis procedure under the Plug-In Digital Framework. To efficiently calculate the system responses, we introduce the frequency response function (FRF)-based substructuring method. Using the random balance designs (RBD), we generate the system responses and estimate the global first-order sensitivities for each joint stiffness. We apply the proposed global sensitivity analysis method to an interior noise problem of a passenger car, and we evaluate the efficiency of the global sensitivity analysis method.

Experimental Study for Concrete Base to Sleeve connection of Hybrid Substructure for Offshore Wind Turbine (하이브리드 해상풍력발전 지지구조물의 콘크리트 베이스-슬리브 연결부에 대한 실험 연구)

  • Lee, Jeong-Hwa;Byun, Nam-Joo;Kim, Seong-Hwan;Park, Jae-Hyun;Kang, Young-Jong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.1
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    • pp.79-87
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    • 2016
  • In this paper, concrete base to sleeve connections of hybrid substructures for offshore wind turbines were suggested and investigated experimentally. Punching shear strength tests with well-instrumented three connections under different reinforcement ratios and loading conditions were conducted to investigate the punching shear strength and the behavior of the concrete base to a sleeve connection. The test results showed that the punching strength and stiffness of the connections are affected mainly by the reinforcement ratios. The loading conditions with an axial load and proportional moment cannot affect the stiffness but affect the strength of the connections because of the axial load-moment interaction. The punching shear failure and critical section of the each test specimen are also discussed.

Design of Vertically Adjustable Transition Piece of Concrete Gravity Based Substructure for Offshore Wind Turbine (수직도 조정이 가능한 콘크리트 중력식 해상풍력 지지구조물 연결부 설계)

  • Shim, WunBo;Ahn, Jin-Young;Kwak, Dong-Woo;Bae, Kyung-Tae;Zi, Goangseup
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.4
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    • pp.42-51
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    • 2018
  • Verticality problem during the installation process in offshore wind turbine substructures could degrade the safety of the whole structures. Therefore, in this paper, the design of vertically adjustable transition piece(T.P.), using a PS anchor and grout of anchor socket in concrete gravity based substructure(G.B.S.), was proposed. T.P. was designed for 5MW offshore wind trubine and can adjust up to $0.5^{\circ}$ in verticality, occurred during installation. The design plan for each members and design procedure for T.P. was proposed. Then based on the proposed design, actual design targeting sea of Jeju-island was carried out. Finally, by use of non-linear 3D Finite Element Analysis(F.E.A.), evaluation of design was performed. As a result of evaluation, by checking load transfer mechanism and stress of T.P, proposed design was considered safe up to $0.5^{\circ}$ of adjustment.

Hybrid Damage Monitoring Technique for Bridge Connection Via Pattern-Recognition of Acceleration and Impedance Signals (가속도 및 임피던스 신호의 특징분류를 통한 교량 연결부의 하이브리드 손상 모니터링 기법)

  • Kim, Jeong-Tae;Na, Won-Bae;Hong, Dong-Soo;Lee, Byung-Jun
    • Journal of the Earthquake Engineering Society of Korea
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    • v.10 no.6
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    • pp.57-65
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    • 2006
  • This paper presents hybrid structural damage monitoring system which performs both global damage assessment of structure and damage detection of local structural joints. Hybrid damage monitoring system is composed of vibration-based technique and electro/mechanic impedance technique. Vibration-based technique detects global characteristic change ot structure using modal characteristic change of structure, and electro/mechanical impedance technique detects damage existence of local structural joints using impedance change of PZT sensor. For the verification of the proposed hybrid monitoring system, a series of damage scenarios are designed to loosened bolts situations of the structural joints, and acceleration response and impedance response signatures are measured. The proposed hybrid monitoring system is implemented to monitor global damage-state and local damages in structural joints.

Analysis on the Sliding Load for Hign-Tension Bolt Joint of the H-Beam in Pure Bending (Pure Bending이 작용하는 H-Beam의 도입축력 변화에 따른 고장력볼트 연결부 거동 분석)

  • Kim, Chun-Ho;Kim, Sang-Hoo
    • Proceedings of the Korea Contents Association Conference
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    • pp.541-544
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    • 2006
  • Currently the bolt joint defect occurs from the steel bridge which is in the process of using but that investigation about each kind defect is lacking state. Research to see consequently the high strength bolt joint sliding conduct bring the model it used a structural analysis program LUSAS numerical analysis execution and a plan for Steel Box Girder Bridge copying full-size H-Beam and plan pretensioned bolt force 100%. 75%, 50% and 25% pretensioned force it acted in standard. And a hold an examination, against the sliding loads which it follows in the pretensioned force it will analysis.

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A Study on Improving the Accuracy of Finite Element Modeling Using System Identification Technique (S. I. 기법을 이용한 유한요소모델의 신뢰도 제고에 관한 연구)

  • 양경택
    • Computational Structural Engineering
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    • v.10 no.2
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    • pp.149-160
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    • 1997
  • Mechanical structures are composed of substructures connected by joints and boundary elements. While the finite element representation of plain substructures is well developed and reliable, joints have a lot of uncertainties in being accurately modelled and affect dynamic behavior of a total system. In order to improve the accuracy of a finite element model, a new method is proposed, in which reduced finite element model is combined with a system identification technique. After substructures except joints are modelled with finite element method and joint properties are represented by parameter states, non-linear state equation is derived in which parameter states are multiplied by physical states such as displacements and velocities. So the joint parameter identification is transformed into non-linear state estimation problem. The methods are tested and discussed numerically and the feasibility for physical application has been demonstrated through two example structures.

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A Study on the Improvement of Connection for Shield Tunnel Lining Using Trapezoidal Segments (쉴드터널 라이닝 사다리꼴 세그먼트의 연결방법 개선에 관한 연구)

  • 정형식;김도열;김정수
    • Journal of the Korean Geotechnical Society
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    • v.15 no.6
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    • pp.251-262
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    • 1999
  • The assemblage of the trapezoidal segments, which is being used increasingly to shield tunnelling, with Guide rod and Dowel forms tunnel lining. In this case the larger the taper angle of trapezoidal segment is, the easier the assembly work becomes. The large angle can reduce the water proof material's phenomenon of being pushed back, but decreases the structural safety in connecting section of tunnel lining. In this paper a 3-dimensional numerical analysis was performed to estimate the exact behavior of a model shield tunnel made by connecting 3-dimensionally various accessories with irregular sectioned segments. We obtained the operating force of connecting section according to the change of taper angle of trapezoidal segment and sought for improved scheme for connecting section by comparing and analyzing the test results on the friction resistance force of connecting parts.

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An Analytical Study on the Strength Behavior of Column-Foundation Connection with High Tension Bolts (고장력 볼트 기둥-기초 연결부의 강도특성에 관한 해석적 연구)

  • Hwang, Dong A;Hwang, Won Sup;Ham, Jun Su;Jeong, Jin Il
    • Journal of Korean Society of Steel Construction
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    • v.28 no.2
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    • pp.121-128
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    • 2016
  • In order to suggest a reasonable design for the circular concrete filled tube steel column-foundation connection applying high-tension bolts, Overall structural behavior and characteristics according to various variables of column-foundation connection are numerically analyzed using a commercial FE analysis program, ABAQUS. To that goal, finite element analysis is conducted on the basis of the previous study replacing anchor bolts to high-tension bolts, and the analytical results are validated by comparison with experimental results. Also, the various variables(embedded depth and grade of anchor, and height and thickness of rib) involved in behavior of the column-foundation connection are selected through analyzing the current design criteria, and the characteristics of the column-foundation connection are compared and analyzed according to the various variables. In case of the anchor bolts, Applying the high-tension bolts is more advantage and securing the embedded depth beyond 0.5D is recommendable. In case of the rib, a minimum of 0.5D for rib's height and $0.4t_b$ for rib's thickness should be secured to develop the structural performance.

Development of Advanced Mechanical Analysis Models for the Bolted Connectors under Cyclic Loads (반복하중을 받는 볼트 연결부에 대한 역학적인 고등해석 모델의 개발)

  • Hu, Jong Wan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.33 no.1
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    • pp.101-113
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    • 2013
  • This paper intends to develop mechanical analysis models that are able to predict complete nonlinear behavior in the bolted connector subjected to cyclic loads. In addition, experimental data which were obtained from loading tests performed on the T-stub connections are utilized to validate the accuracy of analytical prediction and the adequacy of numerical modeling. The behavior of connection components including tension bolt uplift, bending of the T-stub flange, stem elongation, relative slip deformation, and bolt bearing are simulated by the multi-linear stiffness models obtained from the observation of their individual force-deformation mechanisms in the connection. The component springs, which involve the stiffness properties, are implemented into the simplified joint element in order to numerically generate the behavior of full-scale connections with considerable accuracy. The analytical model predictions are evaluated against the experimental tests in terms of stiffness, strength, and deformation. Finally, it can be concluded that the mechanical models proposed in this study have the satisfactory potential to estimate stiffness response and strength capacity at failure.

An experimental study for water tightness of segment under high water pressure (고수압 조건에서의 세그먼트 방수성능평가에 대한 실험적 연구)

  • Choo, Seok-Yean;Park, Young-Jin;Kim, Dong-Hyun;Kim, Yong-Il;Lee, Du-Wha;Cho, Sang-Kook
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.5 no.4
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    • pp.361-370
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    • 2003
  • In this study, the performance of water tightness of water expansional sealing material and gasket was evaluated. The water tightness test was performed varying the type of inner pressure condition, for which the water expansional sealing material was inundated for 5 days to evaluate the ability of water tightness. In order to carry out this test, we made use of two types of water expansional sealing material; general type and combined type with non-expansional rubber. In the case of gasket, EPDM gasket and complex gasket sticked to the water expansional sealing material were applied. The performance of water tightness depended on the construction defect and the deformation of segment. The construction defect and segment deformation were generally expressed by gap and offset of the construction joint. The results, of tests showed that the performance of water tightness was largely influenced by the gap between segments. Management criteria of gap and offset were proposed.

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