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        • A Progressive Failure Analysis Procedure for Composite Laminates II - Nonlinear Predictive Finite Element Analysis

          이규세,Yi, Gyu-Sei Korean Society for Advanced Composite Structures 2014 복합신소재학회논문집 Vol.5 No.4

          A progressive failure analysis procedure for composite laminates is completed in here. An anisotropic plastic constitutive model for fiber-reinforced composite material is implemented into computer program for a predictive analysis procedure of composite laminates. Also, in order to describe material behavior beyond the initial yield, the anisotropic work-hardening model and subsequent yield surface are implemented into a computer code, which is Predictive Analysis for Composite Structures (PACS). The accuracy and efficiency of the anisotropic plastic constitutive model and the computer program PACS are verified by solving a number of various fiber-reinforced composite laminates with and without geometric discontinuity. The comparisons of the numerical results to the experimental and other numerical results available in the literature indicate the validity and efficiency of the developed model.

        • KCI등재

          부착모델을 이용한 강-콘크리트 합성바닥판의 간략 해석

          이규세,Yi. Gyu-Sei 한국방재학회 2011 한국방재학회논문집 Vol.11 No.4

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          In this study, a bond model, which is used to evaluate the behavior of the steel-concrete decks, is proposed. The load-end slip relation in the proposed model is formulated by Newmark theory. The steel-concrete decks are analyzed by finite element analysis with the aid of the proposed bond model. In the finite element analysis, the shear connectors between the steel plate and the concrete are modeled by a number of spring elements. The results of the finite element analysis with the proposed bond model are fairly correlated with the experimental results of the full-size model. This study furthermore indicates that, if the proposed bond model is properly used in the analysis of steel-concrete composite deck, the behavior of the composite deck can be easily analyzed without the aid of the full-size experiment. 본 논문은 강-콘크리트 합성바닥판의 구조적 거동을 간략하게 예측할 수 있도록 부착 모델을 제시하였다. 제안한 부착모델의 단부 슬립 관계는 Newmark 이론을 이용하여 유도되었다. 제안한 부착모델을 이용하여 강-콘크리트 합성바닥판의 유한요소 구조해석을 실시하였다. 유한요소해석에서 콘크리트와 강바닥판 사이의 전단연결재는 스프링요소를 사용하여 모델링하였다. 제안한 부착모델을 이용한 유한요소해석 결과와 실물모형 실험결과는 매우 일치하였다. 따라서, 본 연구 결과는 제안된 부착모델을 적절히 사용한다면 강-콘크리트 합성바닥판의 거동을 실물모형실험 없이도 예측할 수 있음을 보였다.

        • A Progressive Failure Analysis Procedure for Composite Laminates I - Anisotropic Plastic Constitutive Model

          이규세,Yi, Gyu-Sei Korean Society for Advanced Composite Structures 2014 복합신소재학회논문집 Vol.5 No.4

          A progressive failure analysis procedure for composite laminates is developed in here and in the companion paper. An anisotropic plastic constitutive model for fiber-reinforced composite material, is developed, which is simple and efficient to be implemented into computer program for a predictive analysis procedure of composites. In current development of the constitutive model, an incremental elastic-plastic constitutive model is adopted to represent progressively the nonlinear material behavior of composite materials until a material failure is predicted. An anisotropic initial yield criterion is established that includes the effects of different yield strengths in each material direction, and between tension and compression. Anisotropic work-hardening model and subsequent yield surface are developed to describe material behavior beyond the initial yield under the general loading condition. The current model is implemented into a computer code, which is Predictive Analysis for Composite Structures (PACS), and is presented in the companion paper. The accuracy and efficiency of the anisotropic plastic constitutive model are verified by solving a number of various fiber-reinforced composite laminates with and without geometric discontinuity. The comparisons of the numerical results to the experimental and other numerical results available in the literature indicate the validity and efficiency of the developed model.

        • KCI등재

          복합재료 거동특성의 파괴해석1 -이방성 소성 적합모델

          이규세 ( Gyu Sei Yi ) 한국복합신소재구조학회 2014 복합신소재구조학회논문집 Vol.5 No.4

          A progressive failure analysis procedure for composite laminates is developed in here and in the companion paper. An anisotropic plastic constitutive model for fiber-reinforced composite material, is developed, which is simple and efficient to be implemented into computer program for a predictive analysis procedure of composites. In current development of the constitutive model, an incremental elastic-plastic constitutive model is adopted to represent progressively the nonlinear material behavior of composite materials until a material failure is predicted. An anisotropic initial yield criterion is established that includes the effects of different yield strengths in each material direction, and between tension and compression. Anisotropic work-hardening model and subsequent yield surface are developed to describe material behavior beyond the initial yield under the general loading condition. The current model is implemented into a computer code, which is Predictive Analysis for Composite Structures (PACS), and is presented in the companion paper. The accuracy and efficiency of the anisotropic plastic constitutive model are verified by solving a number of various fiber-reinforced composite laminates with and without geometric discontinuity. The comparisons of the numerical results to the experimental and other numerical results available in the literature indicate the validity and efficiency of the developed model.

        • KCI등재

          복합재료 거동특성의 파괴해석 2 -비선형 유한요소해석

          이규세 ( Gyu Sei Yi ) 한국복합신소재구조학회 2014 복합신소재구조학회논문집 Vol.5 No.4

          A progressive failure analysis procedure for composite laminates is completed in here. An anisotropic plastic constitutive model for fiber-reinforced composite material is implemented into computer program for a predictive analysis procedure of composite laminates. Also, in order to describe material behavior beyond the initial yield, the anisotropic work-hardening model and subsequent yield surface are implemented into a computer code, which is Predictive Analysis for Composite Structures (PACS). The accuracy and efficiency of the anisotropic plastic constitutive model and the computer program PACS are verified by solving a number of various fiber-reinforced composite laminates with and without geometric discontinuity. The comparisons of the numerical results to the experimental and other numerical results available in the literature indicate the validity and efficiency of the developed model.

        • KCI등재후보

          Composite Beam Element for Nonlinear Seismic Analysis of Steel Frames

          김기동,고만기,이규세,황병국,Kim, Kee Dong,Ko, Man Gi,Yi, Gyu Sei,Hwang, Byoung Kuk Korean Society of Steel Construction 2002 韓國鋼構造學會 論文集 Vol.14 No.5

          This study presented a composite beam element for modeling the inelastic behavior of the steel beam, which has composite slabs in steel moment frames that are subjected to earthquake ground motions. The effects of composite slabs on the seismic behavior of steel moment frames were investigated. The element can be considered as a single-component series hinge type model whose predicted analytical results were consistent with the experimental results. Likewise, the element showed a significantly better performance than the bare steel beam elements. The composite model can also predict more accurately the local deformation demands and overall response of structural systems under earthquake loading compared with the bare steel models. Therefore, composite stabs can significantly affect locally and globally predicted responses of steel moment frames. 지진 하중에 대한 강재 모멘트 골조의 합성 슬래브를 포함한 강재 보의 비탄성 거동을 모델하기 위한 합성 보 요소가 제안되고 강재 모멘트 골조의 지진 거동에 대한 합성 슬래브의 효과가 조사된다. 합성 보 요소는 단일 직렬 힌지 모델로 간주 될 수 있고, 그 해석 결과는 실험결과와 매우 합리적인 상관 관계를 보였다. 합성 보 요소는 기존의 강재 보 요소보다 상당히 좋은 거동을 보이고, 합성모델은 지진 하중 하에서의 구조물의 국부변형과 전체 응답을 기존의 강재 모델보다 정밀하게 예측할 수 있다. 합성 슬래브는 강재 모멘트 골조의 국부 및 전체 해석 응답에 상당히 큰 효과를 나타낸다.

        • KCI등재

          방파제상 월파시 인간 안정성 평가에 관한 실험적 연구

          배현웅,최홍수,이규세,임남형,Bae. Hyun Ung,Choi. Hong Soo,Yi. Gyu Sei,Lim. Nam Hyoung 한국방재학회 2013 한국방재학회논문집 Vol.13 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          사람이 월파수에 의해 전도될 때 주요 인명피해가 방파제상에서 발생될 수 있다. 지난 40년간 홍수시 인간 안정성 상실 기준을 정의하기 위한 많은 이론적 및 실험적 연구가 진행되었다. 그러나, 월파수에 의한 인간 안정성 상실 현상을 분석하기 위한 이론적 및 실험적 연구는 진행되지 않았다. 본 논문에서는 2차원 대형 파-흐름-조석 복합수조를 활용하여 월파수에 의한 인간 안정성에 대한 실험적 분석을 수행하였다. 이러한 새로운 실험결과로부터, 기존에 수행된 일반적인 홍수흐름에 대한 실험결과와 비교하여 더욱 낮은 유속/낮은 수심에서 인간의 전도가 발생될 수 있음을 알 수 있다. 또한 월파수에 노출된 인간 안정성의 평가기준을 제안한다. Major loss of life can occur in the breakwater when people are toppled by overtopping waves. Over the last four decades, a number of numerical(analytical) and experimental studies to define the limit criteria of the loss of human stability in flood flows have been conducted. However, the analytical or experimental study to investigate the loss of human stability in overtopping waves has not been performed up to now. In this paper, the experimental investigation of the human stability in overtopping waves is conducted using two-dimensional large scale multipurpose wave flume for wave-current-tide. These new experimental results show that the toppling of human can be expected in lower depth/lower velocity compared to that of ordinary flood flows based on previous experimental study. Also the criteria for the stability of people subject to overtopping waves are proposed.

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