• Title/Summary/Keyword: ${\Box}$형 리브

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Buckling Behavior of Plates Stiffened with the New Type Ribs (새로운 형태의 리브를 갖는 보강판의 좌굴거동)

  • Chu, Seok Beom;Lee, Pil Nam
    • Journal of Korean Society of Steel Construction
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    • v.30 no.1
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    • pp.59-66
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    • 2018
  • In this study, the parametric analysis for the buckling behavior of plates stiffened with the new type(${\Box}$ type) ribs was performed. Changes of the buckling capacity according to dimensions of ${\Box}$ type ribs show certain behaviors, so that the system to find the section of ${\Box}$ type ribs under the specific buckling capacity can be proposed. Applying this system to the steel deck of existing bridges, more economic sections of ${\Box}$ type ribs rather than that of closed ribs can be obtained. Therefore, the economic section of steel deck having the required buckling capacity can be designed by using the proposed system of ${\Box}$ type ribs.

A Study of Flutter Analysis for the Composite Box Wings with Various Laminates (다양한 적층각에 대한 상자형 복합재료 날개의 플러터 특성연구)

  • Chung, Y.H.;Kwon, H.J.;Kim, D.H.;Lee, I.;Kim, C.G.
    • Composites Research
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    • v.15 no.1
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    • pp.1-8
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    • 2002
  • In this study, the flutter analysis for a rectangular box wing and an actual fighter wing with composite shin, aluminum spar and aluminum rib has been conducted. A conservative 3D wing-box model of an actual wing is modeled by MSC/PATRAN and the corresponding free vibration analysis has been performed by MSC/NASTRAN. The finite elements of membrane, rod and shear panel are used. Using the practical ply angles, various composite laminates are composed and analysed. The DLM code which is linear aerodynamic theory in frequency domain is applied to calculate unsteady aerodynamic pressure in subsonic flow region and the V-g and p-k methods are applied to obtain the solution of aeroelastic governing equation in frequency domain.

Fatigue Capacity Evaluation of Hinge Type Connection System for a Hybrid Truss Bridge (복합 트러스교 힌지형 격점 구조의 피로 성능 평가)

  • Jung, Kwang-Hoe;Yi, Jong-Won;Lee, Sang-Hyu;Kim, Jay Jang-Ho
    • Journal of the Korea Concrete Institute
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    • v.23 no.3
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    • pp.303-310
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    • 2011
  • To replace a steel box bridge for constructions of medium span bridges in Korea, the Hybrid Truss Bridge (HTB) is being considered as an alternative bridge type. The core technology of HTB is the connection joint that links the concrete slabs and steel truss pipes. Various construction companies in Japan have developed unique connection systems and applied to the real bridge constructions after verifying their performances through the experimental evaluation. In this study, the fatigue test of a hybrid truss girder has been performed in order to verify the newly proposed hinge type connection joint`s static and fatigue capacities. Through this fatigue test results, it is founded that the structural detail to improve the fatigue capacity should be developed. The hinge connection system with circular ribs has been proposed by means of structural finite element analyses. And then the fatigue test for this connection joint has been performed and it is proved that this connection joint has enough fatigue capacity. Finally, it is expected that the hinge connection system with circular ribs developed by in this study can be easily applied to the real bridge.