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김승준,한승룡,김종민,조선규,강영종,Kim, Seung-Jun,Han, Seung-Ryong,Kim, Jong-Min,Cho, Sun-Kyu,Kang, Young-Jong 한국강구조학회 2011 韓國鋼構造學會 論文集 Vol.23 No.1
본 연구에서는 기하학적 비선형 해석을 통해 완성계 사장교의 주요한 좌굴 거동 특성을 규명하였다. 본 해석 연구에서는 케이블의 자중에 의한 새그효과, 주탑 및 거더의 보-기둥 효과, 그리고 대변위 효과 등의 주요한 기하학적 비선형성이 직접적인 비선형 해석을 통해 고려되었다. 주탑과 거더는 비선형 프레임 요소로 모델링 되었고, 케이블은 비선형 등가 트러스 요소로 모델링 되었다. 차량하중으로 가정된 활하중이 고려되었는데, 활하중 해석 전에 고정하중을 합리적으로 고려하기 위해 초기 형상 해석이 수행되었다. 작용하는 활하중 형태에 따른 주요한 비선형 반응을 케이블 배치 형식에 따라 비교 하였고, 이 후 좌굴 안정성에 큰 영향을 미치는 활하중 형태에 대해 케이블의 배치 형식, 주탑과 거더 간 강성비, 케이블의 단면적, 케이블의 단수 등의 기하학적 특성이 좌굴 모드 및 임계 하중 계수의 변화에 미치는 영향을 규명하였다. This paper presents an investigation of the structural stability of cable-stayed bridges, using geometric nonlinear finite-element analysis and considering various geometric nonlinearities, such as the sag effect of the cables, the beam-column effect of the girder and mast, and the large displacement effect. In this analytic research, a nonlinear frame element and a nonlinear equivalent truss element were used to model the girder, mast, and cable member. The live-load cases that were considered in this research were assumed based on the traffic loads. To perform reasonable analytic research, initial shape analyses in the dead-load case were performed before live-load analysis. In this study, the geometric nonlinear responses of the cable-stayed bridges with different cable arrangement types were compared. After that, parametric studies on the characteristics of the structural stability in critical live-load cases were performed considering various geometric parameters, such as the cable arrangement type, the stiffness ratios of the girder and mast, the area of the cables, and the number of cables. Through this parametric study, the effect of geometric shapes on the structural stability of cable-stayed bridges was investigated.
구조물 변위 계측을 위한 최적 센서 배치 지점 산정에 관한 연구
최준호 ( Choi Jun Ho ),한승룡 ( Han Seung Ryong ),원덕희 ( Won Deok Hee ),최재규 ( Choi Jae Kyoo ),강영종 ( Kang Young Jong ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In this days, many researchers were study of effective structure maintenance. Many sensors such as accelerometer, strain gauge, etc are used for measurement of structure behavior. It is more effective that many sensors are installed in many locations, however, there is restriction to install sensor in many locations. So we have to determine optimized sensor location of displacement measurement. In this study, we optimize the sensor location that can be express effectively structure behavior by using displacement sensitivity.
배현웅(Hyun-Ung Bae),한승룡(Seung-Ryong Han),최진유(Jin-Yu Choi),임남형(Nam-Hyoung Lim) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
The buckling behavior of CWR tracks is affected by the various parameters such as stiffness and geometry of track panel, ballast resistance, rail temperature, initial imperfection, and wheel load. Until now, CWR tracks were managed by the dichotomous logic (deterministic approach) despite these influence factors are having the nature of random variables. So, the design method and existing management process to prevent the track buckling can be very non-economic since the value of these influence factors to calculate the track buckling strength are selected by considering the worst track condition. In this study, buckling probability evaluation process is proposed which is based on the reliability index, AFOSM method, and limit state equation.
최준호 ( Choi Jun-ho ),한승룡 ( Han Seung-ryong ),김성남 ( Kim Sung-nam ),원덕희 ( Won Deok-hee ),강영종 ( Kang Yong-jong ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Recently, maintenance of structure is more important than past time. Displacement measurement for maintenance of structure will be very efficient method than any other measurement data. However displacement measurement is difficult, so there are many method to assume displacement In this paper, we study displacement measurement for estimate the structure condition on stress level.
원덕희,한택희,김승준,한승룡,강영종,Won, Deok-Hee,Han, Taek-Hee,Kim, Seung-Jun,Han, Seung-Ryong,Kang, Young-Jong 한국복합신소재구조학회 2011 복합신소재구조학회논문집 Vol.2 No.2
현재 강재와 콘크리트를 합성화 시키는 방법으로 대표적인 것이 스터드를 이용하는 것이다. 그러나 이 방법을 강합성 기둥에 적용할 경우에 용접량이 많아져 이로 인하여 강재의 성능이 변하여 국부좌굴로 유도될 가능성이 매우 크다. 외부가 구속된 CFT 부재나 내부 구속 중공 CFT 부재 그리고 내부가 강관으로 내부 구속 중공 RC 부재에 적용할 경우에 합성 거더에 비하여 강재와 콘크리트가 분리되려는 인발력 대신 슬립에 의한 분리현상이 더 크게 발생한다. 이렇기 때문에 스터드의 높이 보다는 콘크리트와 강재가 합성되는 면적을 넓혀주는 것이 더 필요하다. 이러한 목적을 달성하기 위하여 일정부분 강관에 용접을 하여 부착을 하고 ㄷ자 형으로 제작된 슬립앵커의 철근이 콘크리트 속에 삽입되어 강재와 콘크리트의 일체 거동성을 높였다. 이러한 방법의 경우에는 곡률을 가진 강구조물 등에 적용될 경우 큰 효과를 발휘할 것으로 판단된다. 본 연구에서는 제안된 슬립앵커를 H빔에 설치를 하여 축하중을 가하는 Push-over Test를 통하여 거동 특성을 분석하였다. Presently, composite method for steel and concrete is often used the stud. Steel properties of composite column could be changed by increasing of welding. The changed properties is possibly to cause local-buckling. Composite column had a large effect by slip instead of pull-out force in comparison composite girder. Improvement of adhesive force had effect by contact area rather than height of stud in composite column. This paper proposed new type of stud and analyzed performance through experimental study. This method would be effect steel structure with curvature.
최준호(Choi, Jun-Ho),한승룡(Han, Seung-Ryong),김성남(Kim Sung-Nam),원덕희(Won, Deok-Hee),강영종(Kang, Yong-Jong) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
Recently, maintenance of structure is more important than past time. Displacement measurement for maintenance of structure will be very efficient method than any other measurement data. However displacement measurement is difficult, so there are many method to assume displacement. In this paper, we study displacement measurement for estimate the structure condition on stress level.
강영종(Kang Young-Jong),한승룡(Han Seung-Ryong),박남회(Park Nam-Hoi) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
In locations where the cost of concrete is relatively high, or in situations where the weight of concrete members is to be kept to a minimum, it may be economical to use hollow reinforced concrete vertical members. Hollow reinforced concrete columns with low axial load, moderate longitudinal steel percentage, and a reasonably thick wall were found to perform in a ductile manner at the flexural strength, similar to solid columns. However, hollow reinforced concrete columns with high axial load, high longitudinal steel percentage, and a thin wall were found to behave in a brittle manner at the flexural strength, since the neutral axis is forced to occur away from the inside face of the tube towards the section centroid and, as a result, crushing of concrete occurs near the unconfined inside face of the section. If, however, a steel tube is placed near the inside face of a circular hollow column, the column can be expected not to fail in a brittle manner by disintegration of the concrete in the compression zone. Design recommendation and example by moment-curvature analysis program for curvature ductility are presented. Theoretical moment-curvature analysis for reinforced concrete columns, indicating the available flexural strength and ductility, can be conducted providing the stress-strain relation for the concrete and steel are known. In this paper, a unified stress-stain model for confined concrete by Mander is developed for members with circular sections.
균일 모멘트가 작용하는 파형 복부판 거더를 갖는 변단면 I형 거더의 횡비틂좌굴 강도 연구
웬녹듕(Nguyen, Ngoc Duong),한승룡(Han, Seung-Ryong),최준호(Choi, JunHo),강영종(Kang, Young Jong) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
This paper presents the elastic lateral-torsional buckling (LTB) of tapered I-girder with corrugated webs under uniform moment. The theoretical results of LTB strength are obtained from developed finite element (FE) program by using beam element. Then, the obtained results are compared with commercial packages ABAQUS using shell elements to verify the accuracy of the developed FE program. From the investigation FE results, the new equation are proposed for calculating the LTB resistance of tapered I-girder with corrugated webs. The proposed equation increases efficiency in bridges and buildings design.