• Title, Summary, Keyword: Buckling

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Parametric Study on Buckling Behavior of Sinusoidal Corrugated Web Girder (파형 강판 웨브를 갖는 보의 매개변수 해석 연구)

  • Park, Geun-Woo;Lee, Seo-Haeng;Yoo, Jung-Han
    • Journal of the Korean Association for Spatial Structures
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    • v.18 no.1
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    • pp.101-108
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    • 2018
  • The purpose of this study was to analyze some parameters' effects on buckling behavior of Sinusoidal Corrugated Web using finite element analysis program. Studying buckling behavior is one of the most important things to design sinusoidal corrugated web girders and predict the shear performance. In this paper, Four parameters of Sinusoidal Corrugated Web, which are thickness($t_w$), height($h_w$), wave height(${\alpha}_3$) and wave length(w), were selected for buckling behavior analysis. Via buckling analysis, it is shown that $t_w$, $h_w$ and ${\alpha}_3$ have influence on shear buckling stress, Initial stiffness and reduced strength after buckling.

Development of Empirical Equation for Prediction of Minimal Track Buckling Strength (곡선부 궤도의 최소좌굴강도 추정식의 개발)

  • Yang, Sin-Chu;Kim, Eun;Lee, Jee-Ha;Shin, Jung-Ryul
    • Proceedings of the KSR Conference
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    • pp.475-480
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    • 2001
  • In this study, a empirical equation which can be feasibly used to evaluate minimal track buckling strength without exact numerical analysis is presented. Parameter studies we carried out to investigate the effects of the individual factor on buckling strength. In order to simulate track buckling in the field as precisely as possible, a rigorous buckling model which accounts for all the important parameters is adopted. A empirical equation for prediction of minimal track buckling strength is derived by taking nonlinear regression of data which are obtained from numerical analyses. Its characteristics and applicability are investigated by comparing the results by the presented equation with the one by the equation which was presented in japan, and is frequently using in korea when designing track structure.

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Buckling Analysis of Grid-Stiffened Composite Plates Using Hybrid Element with Drilling D.O.F.

  • Cho, Maenghyo;Kim, Won-Bae
    • Computational Structural Engineering : An International Journal
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    • v.3 no.1
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    • pp.19-29
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    • 2003
  • In the present study, finite element linear buckling analysis is performed for grid-stiffened composite plates. A hybrid element with drilling degrees of freedom is employed to reduce the effect of the sensitivity of mesh distortion and to match the degrees of freedom between skins and stiffeners. The preliminary static stress distribution is analyzed for the determination of accurate load distribution. Parametric study of grid structures is performed and three types of buckling modes are observed. The maximum limit of buckling load was found at the local skin-buckling mode. In order to maximize buckling loads, stiffened panels need to be designed to be buckled in skin-buckling mode.

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A Study on the Deflection Mode of a Ship's Plate according to the Arc-Length Method (호장증분법에 의한 선체판의 처짐모드에 관한 연구)

  • 고재용;박주신;이돈출;박성현
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.732-737
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    • 2003
  • Recently, the buckling is easy to happen a thin plate and High Tensile Steel is used at the structure so that it is wide. Especially, the buckling is becoming important design criteria in the ship structure to use especially the High Tensile Steel. Consequently, it is important that we grasp the conduct after the buckling behaviour accurately at the stability of the body of ship structure. In this study, examined closely about conduct and secondary buckling after initial buckling of thin plate structure which receive compressive load according to various kinds aspect ratio under simply supported condition that make by buckling formula in each payment in advance rule to place which is representative construction of hull. Analysis method is F.E.M by ANSYS and complicated nonlinear behaviour to analyze such as secondary buckling.

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Buckling of Buriend Pipelines due to Seismic Waves (지진파에 의한 매설관로의 좌굴)

  • 이종세
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.109-118
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    • 1999
  • Lifeline system such as oil or gas pipelines and water supply facilities are vulneratble to seismic damages because they are widely exposed to ground failures. Most seismic design criteria of buried pipelines are based on the notion that the longitudinal compressive strain and therefore buckling controls the design. Buckling analysis of buried pipelines subjected to seismic loading is performed by considering the seismic load as the sinusoidally distributed compressive load on the beam on elastic foundation in contrast to existing studies where the buckling load is treated as an end load on the beam column, An approximated analytical solution is obtained by the energy method and its validity is confirmed by the linearized finite element buckling analysis. The results show the beam mode buckling because longitudinal strains at the buckling loads are substantially lower than the strain at the onset of local buckling.

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Studies on the Plate Buckling Properties of Plain-knitted Cotton Fabrics (위편성물의 Plate Buckling 특성에 관한 연구)

  • Park, Sin-Ung;Yu, Jin-Hyeong;Gang, Bok-Chun
    • Textile Science and Engineering
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    • v.24 no.6
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    • pp.24-30
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    • 1987
  • The plate bucking properties of plain-knitted cotton fabrics were studied for the purpose of improving the quality of textile products. The variations of buckling and bending properties were investigated with references of the various cover factor and yarn counts. The comparison between the values of plate bucking forces predicted by pure bending tester and the values obtained by actual buckling experiments were also studied. The variations of experimental values of cycling buckling and the comparison beyound the 40% compression were also examined. The results of this study are summarized as follows ; 1) The buckling force, bending rigidity and bending moment are increased with increasing in cover factor and yarn counts. 2) The predicted formulae of buckling force suggested by Grosberg and Swani can be well applied to the plain-knitted cotton fabrics up to the extension limit. 3) The shape of cycling buckling curves after 4 cycles are in steady state and the force loaded to the fabrics is not relevant to the strain and nearly constant beyond certain limited point.

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Finite Element Analysis of the Shear Buckling Load with Respect to the Aspect Ratio and Number of Spots of two Rectangular Plates Spot-welded (점용접된 두 사각평판의 형상비 및 용접점수에 대한 전단좌굴하중의 유한요소해석)

  • 한근조;전형용;이현철
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.6
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    • pp.173-181
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    • 2000
  • The stability of a structural plate is a crucial problem which causes wrinkling and buckling. In this paper, the effect of the pattern of spot-welding points in the two rectangular plate on the shear buckling load is studied with respect to the thickness, the aspect ratio of plates, the number of welding spots. Buckling coefficient of the simple plate was compared with that of two plates with various conditions to extract the effect of buckling strength. The effect of the number of welding spots are studied in two directions, longitudinal and transverse directions. The concluded that the reinforcement effect was maximized when the aspect ratio was close to 1.5 and that the effect of number of welding spots in longitudinal direction was larger than that in transverse direction.

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A Study on the Buckling Characteristics of Double-Layer Latticed Domes whose Boundary Configuration are Elliptical (경계부 형상이 타원형인 복층 래티스 돔의 좌굴 특성에 관한 연구)

  • Seo, Young-Ill;Kwun, Ik-No;Kwun, Taek-Jin
    • Journal of the Korean Association for Spatial Structures
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    • v.2 no.3
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    • pp.71-79
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    • 2002
  • The purpose of this paper is to study the buckling characteristics of elliptical latticed domes under conservative loading conditions. The latticed domes are usually designed in geometrically spherical shape. For this type of latticed domes, many researchers have researched and even the simplified estimation codes for the buckling load level have been available. However, geometrically elliptical latticed domes have been often constructed, and show different buckling characteristics following with geometrical parameters as rise-to-span ratio and so on. Therefore, it is necessary to investigate the general tendency of buckling characteristics of the elliptical latticed domes. In this paper, to find out some buckling characteristics of elliptical latticed domes, height, boundary configuration and gap are used as the shape coefficients. For each model with different parameters, the eigen values and the buckling loads are evaluated.

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A Study on the Ultimate Strength of a Ship's Plate accompanied Secondary Buckling in used Arc-Length Method (호장증분법을 이용한 2차좌굴을 동반한 선체판의 최종강도에 관한 연구)

  • 고재용;박주신;주종길
    • Proceedings of KOSOMES biannual meeting
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    • pp.159-165
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    • 2003
  • To Recently, the buckling is easy to happen a thin plate and High Tensile Steel is used at the structure so that it is wide. Especially, the buckling is becoming important design criteria in the ship structure to use especially the High Tensile Steel. Consequently, it is important that we grasp the conduct after the buckling behaviour accurately at the stability of the body of ship structure. In this study, examined closely about conduct and secondary buckling after initial buckling of thin plate structure which receive compressive load according to various kinds aspect ratio under simply supported condition that make by buckling formula in each payment in advance nile to place which is representative construction of hull. Analysis method is F.E.M by ANSYS and complicated nonlinear behaviour to analyze such as secondary buckling.

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Buckling of Bimodulus Composite Thin Plate (이중탄성계수 복합재료판의 좌굴)

  • 이영신;김종천
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.6
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    • pp.1520-1534
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    • 1994
  • A new analytical method for the prediction of the buckling behavior of laminated plates consisting of layers having different properties in tension and compression, so called bimodulus, is proposed in this paper. Buckling analysis of bimodular composite laminated paltes are performed with the results reduced from plate bending analysis. The governing equations of bimodular plates are based on the first shear deformation theory. As a case study, bending and buckling of simply supported, multilayered, symmetric, antisymmtric, and specially orthotropic laminates under uniformly distributed lateral load for bending analysis and in-plane load for buckling are considered. The results of the bending analysis are compared with the previous papers. Then, the fundamental critical buckling loads and buckling modes are calculated for the various bimodular composite rectangular thin plates.