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강영종,임남형,신정렬,양재성,Kang, Young Jong,Lim, Nam Hyoung,Shin, Jeong Ryol,Yang, Jae Seong 한국강구조학회 1999 韓國鋼構造學會 論文集 Vol.11 No.3
수십 년 동안, 철도는 차량의 운영과 조작 기술에 맞추어 짧은 길이의 레일을 서로 신축 이음을 두고 연결한 궤도를 이용하여 건설되었다. 그러나 이러한 신축이음들은 궤도 손상과 유지비 증가 등의 많은 단점들을 유발시켰다. 그래서, 철도 기술자들은 차량, 용접, 체결의 기술이 발전함에 따라 열차 하중, 속도의 증가를 위해 레일 사이의 신축 이음을 제거하는 데 많은 관심을 가지게 되었다. 그래서 최근 등장한 것이 기존 레일의 단점들을 해소할 수 있는 CWR궤도이다. 그러나 이러한 CWR궤도는 기존 레일의 단점을 극복할 수 있었으나 레일의 장대화에 따른 온도 하중으로 인한 레일의 좌굴 문제를 야기시켰다. 본 논문에서는 유한 요소 해석을 이용하여 선형 좌굴 해석을 위한 CWR 궤도의 모델과 해석 프로그램인 CWRB를 개발하였다. 레일의 해석 모델은 레일요소 당딤을 고려한 14개의 자유도로 나타내었으며, 체결재, 침목, 도상 저항력을 스프링 요소를 사용하였다. 장대레일의 온도하중에 의한 좌굴 온도 및 모드의 분석으로 장대레일의 온도 좌굴 특성을 고찰하였다. For many decades, the railway was constructed using tracks with jointed rails of relatively short lengths in accordance with rolling and handling technology. The joints cause many drawbacks in the track and lead to significant maintenance cost. So, railroad engineers became interested in eliminating joints to increase service loads ana speeds by improving rolling, welding, and fastening technology. Continuous welded rail(CWR) track has many advantages over the conventional jointed-rail track. But, in the case of the elimination of rail joints, it may cause the track to be suddenly buckled laterally by thermal loads. In this paper, CWR track model and CWRB program are developed for linear buckling analysis using finite element method. Rail element with a total of 14 degrees of freedom is used. The stiffness of the fastener, tie, and ballast bed are included by a set of spring elements. The investigation on the buckling modes and temperature of CWR track is presented.
임남형(Nam Hyoung Lim),강영종(Young Jong Kang),유철수(Chul Soo Yu) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.2
A buckling theory was developed by applying the strain-displacement relations of Kang`s thin-walled curved beam theory to monosymmetric circular arches, a set of stability equations were obtained. An explicit and clear approximation of the curvature effect was made in the derivation process. Closed form solutions were obtained for arches subjected to equal and opposite end moments. An extensive comparative study with other studies provided the validity of the presented theory.
강영종(Kang Young-Jong),임남형(Lim Nam-Hyung),신정렬(Shin Jeong-Ryol),양재성(Yang Jae-Seong) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
For many decades, the railway was constructed using tracks with jointed rails of relatively short lengths in accordance with rolling and handling technology. The joints cause many drawbacks in the track and lead to significant maintenance cost. So, railroad engineers became interested in eliminating joints to increase service loads and speeds by improving rolling, welding, and fastening technology. Continuous welded rail(CWR) track has many advantages over the conventional jointed-rail track. But, in the case of the elimination of rail joints, it may cause the track to be suddenly buckled laterally by thermal and vehicle loads. Thermal loads are caused by an increase in the temperature of railway track. In this paper, CWR track model and CWRB program are developed for linear buckling analysis using finite element method(FEM). The finite element discretization is used with a total of 14 degrees of freedom for each rail element. The stiffness of the fastener, tie, and ballast bed are included by a set of spring elements. The investigation on the buckling modes and temperature of CWR track is presented in the paper.
Crystallization of Stereo-Irregular Polymers by Using Entropy Diluent
Young Jong Kang(강영종) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
It has been believed that stereo-irregular polymers cannot form crystalline structure because of the deficient ordering along the backbone direction. Here we show the crystallization of atactic polymers by rapid thermal quenching of polymers co-melted with an entropy diluent. To this end, a-PMMA, a-PS and polycarbonate are crystallized by using entropy diluent, BA. The preferential hydrogen bonding and pi-pi interaction between polymers and BA compensates the conformational entropy loss of polymer chains in solutions. Due to highly stretched structure, the crystals prepared by the entropy diluent show unusual physical properties including extremely high melting points and mechanical strength and unprecedented crystalline transitions.
강영종(Young Jong Kang),최영준(Young Joon Choi) 한국강구조학회 1995 韓國鋼構造學會誌 Vol.7 No.4
A rigorous theory of curved beams governing static, bifurcation buckling, and nonlinear behavior was presented by Kang and Yoo in 1994. Their theory was extended herein to derive equations of motion governing dynamic behavior of horizontally curved beams. The equations of motion thus derived were numerically formulated as well. The equations of motion were solved analytically as well as numerically and compared with other solutions. Particularly, the present finite element formulation enables to investigate mostly unknown free vibration characteristics under various boundary conditions.
실 고속열차하중을 고려한 이중 리브 아치 교량의 동적해석
강영종(Young-Jong Kang),김정훈(Jung-Hun Kim),신주환(Ju-Hwan Shin),이명섭(Myeong-Sup Lee) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
High speed railway structure, contact of vehicle needs to design considering the running stability(dynamic behavior). Also, upper structure has to satisfy design standard about moving load, high speed train(KTX). So, the high speed railway structure has to satisfy the requirement of natural frequency, vertical acceleration on deck, face distortion and vertical displacement considering ride comfort, which is suggested Ho-nam high speed railway design standard. In this study, it was investigated and evaluated to the dynamic behavior for a double-rib arch railway bridge subjected to moving load considering real high speed train loads.
강영종(Young-Jong Kang),웬판반(Van-Ban Nguyen),김정훈(Jung-Hun Kim),강윤석(Yoon-Suk Kang) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
In this paper, the nonlinear dynamic response of Vehicle-Bridge interaction with the coupled equations of motion including nonlinear Hertzian contact is presented. The moving train model is chosen to have 10 degrees of freedom (DOF). The bridge is modeled as 2D Euler-Bernoulli beam element with 4 DOF for each element, two for rotations and another two for translations. The nonlinear Hertzian contact is used to simulate the interaction between vehicle and bridge. Base on the relationship of wheel displacement of the vehicle and the vertical displacement of the bridge in Hertzian contact, the coupled equations of motion of the whole system is derived. The convenient formulation was encoded into a computer program. The contact forces, contact area and stress of the rail surface were also computed. The accuracy and efficiency of the proposed program are verified and compared with exact analytical solution and other previous studies. Various numerical examples and parametric studies have demonstrated the versatility and applicability of the proposed program.