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이주탁,김승준,김종민,최준호,강영종,Lee, Joo-Tak,Kim, Seung-Jun,Kim, Jong-Min,Choi, Jun-Ho,Kang, Young-Jong 한국강구조학회 2011 韓國鋼構造學會 論文集 Vol.23 No.6
본 연구는 데릭크레인과 인양중인 새그먼트 자중에 의한 외력이 작용하는 시공중인 폐합 직전 사장교의 기하비선형성 및 재료비선형성을 고려한 비선형 해석을 통해 극한 거동을 규명하였다. 시공중 사장교의 상태를 수치적으로 구현하기 위해 초기형상 해석과 역방향 시공단계 해석을 순차적으로 진행하였고, 이후에는 데릭크레인 및 인양중인 새그먼트 자중을 중앙경간 최 측단에 재하 하여 폐합 전 강사장교의 주요한 거동을 모사하였다. 또한 주요 매개변수에 따른 극한거동 및 극한하중계수의 변화를 정량적으로 분석하기 위한 방법으로 주탑-거더간 강성비와 케이블 면적을 변화하면서 거동을 관찰하였고, 기하비선형성과 재료비선형성 모두를 고려한 극한해석 결과를 기하비선형성만을 고려한 기하비선형 해석과 비교하여 보다 구체적이고 정량적인 극한거동에 대해 분석하였다. This paper presents an investigation on the ultimate behavior of steel cable-stayed bridges in the construction stage, considering various geometric nonlinearities and material nonlinearities. To numerically determine the state of cable-stayed bridges in the construction stage, initial shape analysis and construction stage analysis via backward process analysis were done sequentially. Then nonlinear analysis of the state under the construction load condition, considering the weight of the derrick crane and the key segment of the girder loaded onto the tip of the center span, was performed to investigate the ultimate behavior of the structure. The effects of the girder-mast stiffness ratio, the cable-arrangement types, and the area of the stay cables on the ultimate behavior were also extensively investigated. Moreover, the results of the ultimate analysis, considering both geometric nonlinearities and material nonlinearities, were compared with the results of the geometric nonlinear analysis, for a more meaningful investigation of the ultimate behavior of steel cable-stayed bridges in the construction stage.
원덕희(Won, Deok-Hee),이주탁(Lee, Joo-Tak),한택희(Han, Taek-Hee),김승준(Kim Seungjun),강영종(Kang, Young-Jong) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
In this study fire-resistant of the ICH RC columns is analyzed by using Heat transfer analysis and nonlinear material models program. Hollow ratio, thickness of the concrete and thickness of the internal tube are selected to parameters. and Parameter study was performed. and then factors which increase Fire-resistant performance of ICH RC were presented and analyzed.
원덕희 ( Won Deok-hee ),이주탁 ( Lee Joo-tak ),한택희 ( Han Taek-hee ),김승준 ( Kim Seungjun ),강영종 ( Kang Young-jong ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
In this study fire-resistant of the ICH RC columns is analyzed by using Heat transfer analysis and nonlinear material models program. Hollow ratio, thickness of the concrete and thickness of the internal tube are selected to parameters, and Parameter study was performed, and then factors which increase Fire-resistant performance of ICH RC were presented and analyzed.
접촉 스프링의 비선형을 고려한 궤도의 고주파 진동 해석 알고리즘 개발
김정훈(Kim Jung-Hun),박대근(Park Dae-Geun),이주탁(Lee Joo-Tak),강영종(Kang Young-Jong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
According as interests about environmental problem are being increased nowadays, social requirements about environmental friendliness of the railway are also being increased gradually and rapidly. In result, it was shown to increasement of a civil appeal & conflict and improvement of environmental standard. In the case of Korea, analysis technology for railway noise and vibration leaves something to be desired. In this study, we suggested a high frequency vibration analysis algorithm for track considering non-linearity of contact spring in order to develop core techniques.