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강영종(Young Jong Kang),정주호(Ju Ho Jung),윤기용(Ki Yong Yoon) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.2
In the present study, a numerical formulation procedure for structural analysis of thin-walled horizontally curved multi-girder bridges is presented. The presented finite element procedure consists of curved and straight beam elements including warping degree of freedom. The curved beam elements is based on the new theory of thin-walled curved beams by Kang and Yoo presented in 1994. The homogeneous solutions of curved beam equations were used for shape functions in the numerical formulation to achieve good convergence. In the straight beam element, the third order hermite polynomials were used for shape functions. Employing the method of static condensation, the presented procedure is designed to treat various types of connections. Also included in the present study is the incorporation of skew boundary conditions which are inevitable in most curved multi-girder Bridges. The developed numerical procedure was then applied to investigate the structural behavior of multi-girder bridges with oaring cross frame spacing, girder spacing, and subtended angle.
윤기용,강영종,Yoon, Ki Yong,Kang, Young Jong 한국강구조학회 1998 韓國鋼構造學會 論文集 Vol.10 No.1
수평곡선 I형교에서는 곡선주형의 초기곡률로 인하여 휨과 비틀림이 서로 연성 되어 복잡한 거동을 하며. 교량전체 거동에 가로보가 미치는 영향이 상당히 크다. 수평곡선 I형교의 거동특성을 파악하기 위해서는 곡선주형과 함께 가로보를 고려하여야 한다. 본 연구에서는 수평곡선 I형교에 대한 자유진동해석을 위하여 곡선주형을 유한요소 모델링하기 위한 곡선보요소와 가로보를 모델링하기위한 직선보요소를 구성하고, 이들 보요소를 사용한 유한요소 해석 프로그램을 개발한다. 곡선보 요소는 초기곡률과 됨을 고려하기 위하여 박판곡선보 이론에 근거하여 2축 대칭단면을 갖는 I형 곡선보에 대한 유한요소 정식화를 통하여 구성되며, 이때 형상함수는 박판곡선보의 선형 정적 평형방정식의 제차해를 사용한다. 직선보 요소는 됨자유도를 포함하여 절점당 7자유도를 갖는다. 개발한 프로그램에서는 직교좌표계를 사용하여 전체 강성행렬과 전체 질량행렬을 구성하며, 고유치를 구하기 위하여 Gupta의 방법을 사용한다. 기존의 연구결과를 이용하여 구성된 곡선보 요소를 비교검증하고, 수치해석 예제를 통하여 개발한 프로그램의 결과와 쉘요소를 사용하여 범용유한요소해석프로그램으로 수행한 결과를 비교한다. The behavior of horizontally curved I-girder bridges is complex because the flexural and torsional behavior of curved girders are coupled due to their initial curvature. Also, the behavior is affected by cross beams. To investigate the behavior of horizontally curved I-girder bridges, it is necessary to consider curved girders with cross beams. In order to perform free vibration analyses of horizontally curved I-girder bridges, a finite element formulation is presented here and a finite element analysis program is developed. The formulation that is presented here consists of curved and straight beam elements, including the warping degree of freedom. Based on the theory of thin-walled curved beams, the shape functions of the curved beam elements are derived from homogeneous solutions of the static equilibrium equations. Third-order hermits polynomials are used to form the shape functions of the straight beam elements. In the finite element analysis program, global stiffness and mass matrix are composed, based on the Cartesian coordinate system. The Gupta method is used to efficiently solve the eigenvalue problem. Comparing the results of several examples here with those of previous studies, the formulation presented is verified. The validity of the program developed is shown by comparing results with those analyzed by the shell element.
한택희,김성남,강영종,윤기용,Han, Taek-Hee,Kim, Sung-Nam,Kang, Young-Jong,Yoon, Ki-Yong 한국방재학회 2004 한국방재학회논문집 Vol.4 No.2
최근 항공기, 자동차 등에 사용되어왔던 복합재료가 그 사용 영역을 넓혀 교량 상판, 상하수도용 관로 등에 적용되고 있다. 이러한 복합재료의 주요 장점은 고강도, 경량성, 그리고 뛰어난 내부식성으로 기존의 재료에 비해 많은 장점을 갖고 있으나, 이러한 재료의 정확한 특성 파악 및 이를 사용한 구족물의 거동의 정확한 분석의 어려움으로 복합재료의 적용이 활발히 이루어지지 못하고 있는 실정이며, 이러한 요인이 복합재료를 토목구조물에 적용하는데 가장 큰 제한요소로 작용해 왔다. 본 연구에서는 복합재료 구조물의 해석을 위한 사전 연구로서, 현재 국내에서 사용되고 있는 GFRP 관로에 대한 재료특성 실험을 수행하여, 각각의 구성 적층재료별 재료 특성 및 전체 적층판에 대한 재료특성을 제공한다. Recently, the composite material becomes more popular and its usage is kept expanding from aerospace to civil structures such as bridge decks and irrigation and drainage pipes. The major cause for the popularity can be found in its high strength, light, and excellent anticorrosive properties. Nevertheless the methods to accurately predict and analyze its structural behavior are extremely limited. This has been the major reason circumventing more prevalent use of the composite materials in civil structures. This study is a pre-study to develop the analyzing models for accurate prediction of the composite material structures. Thus, various tests were performed for GFRP pipes to estimate material characteristics of GFRP in this study. And stress-strain relation of GFRP was suggested as a bilinear relation.
김종민 ( Kim Jong-min ),최준호 ( Choi Jun-ho ),최병호 ( Choi Byung-ho ),한승룡 ( Han Seung-ryong ),강영종 ( Kang Yong Jong ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Experimental study on curved tub girders which applied by concrete self-weight is performed in this study. Axial forces of top lateral bracing are compared with results of design equations presented by other researchers. For curved tub girders, it is important to consider the stiffness of cross beam because lateral displacements of top flange are different with no cross beam system. And bracing forces at inner girder part have larger values than outer girder, because there are additional moment loading by pouring concrete.
김종민 ( Kim Jong-min ),최준호 ( Choi Jun-ho ),황민오 ( Hwang Min-oh ),한승룡 ( Han Seung-ryong ),강영종 ( Kang Yong Jong ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
High performance steel for bridges(HSB) which has higher performance in tensile, yield strength, toughness, weld-ability than commom steels had been developed Among of them, HSB800 has the most highest strength and it has a minimum tensile strength of 800MPa In this paper, study on ultimate flexural behavior of plate girder using HSB800 is performed By running Three-dimensional finite-element analysis program, ABAQUS, nonlinear analysis of plate girder under pure bending is evaluated with varying width-thickness parameters of flanges and web. Ultimate bending moments calculated from analysis had been compared with other plate girders which has different material properties and presented with domestic and international design codes. If more studies under various cases like under pure shear, lateral-torsional buckling something would be performed, it should be good datas to establish domestic bridge design codes of HSB800.