연속철근 콘크리트 포장체의 피로실험을 위한 모델링

이규세 선문대학교 1998 공과대학논문집 Vol.1 No.1

시멘트 콘크리트 포장은 대형 차량 하중에 대한 지지력이 좋고 수명이 길며, 시공 후에 잦은 유지 보수가 필요치 않다는 측면에서 국내 고속도로에는 1980년대 도입된 이후부터 그 사용이 급격히 증가하였으며, 앞으로 건설되는 대규모 고속도로들도 콘크리트 포장으로 시공할 가능성은 증가하고 있다. 이에 본 연구 는 균열에 의한 Punch-Out 파괴에 따른 콘크리트 포장의 수명을 규명하기 위하여 이론적 연구를 수행하여 1/4로 상사한 시험체를 제작하고 정적하중 재하실험을 실시하였다. The use of cement concrete pavement in the roadway system has increased since its first application in 1980's in Korea by virtue of its good durability and excellent load-resisting capacity. In this study, eight 1/4 reduced specimens were tested to investigate the fatigue life expectancy of. continuously reinforced concrete pavements(CRCP). First, a static test was performed to define the static failure load.

A New Yield Criterion for Fiber-Reinforced Composite Materials

이규세 선문대학교 2000 공학계열 논총 Vol.3 No.-

A new yield criterion for fiber-reinforced composite material is developed, which is simple and efficient to be implemented into an incremental elastic-plastic constitutive model. The constitutive model is for a predictive analysis procedure for composites, to represent progressively 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. The current model is implemented into a computer code, which is Predictive Analysis for Composite Structures (PACS). The accuracy and efficiency of the yield criterion 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.

복합재료 거동특성의 파괴해석Ⅰ- 이방성 소성 적합모델

Yi, Gyu-Sei 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.

Plastic and Endochronic Based Constitutive Models for Concrete

Gyu-Sei Yi,Hak-Eun Lee 대한토목학회 1998 KSCE journal of civil engineering Vol.2 No.2

Progressive Failure Analysis of Concrete Structures Using Plasticity and Endochronic Based Models

Gyu-Sei Yi,Hak-Eun Lee 대한토목학회 1998 KSCE journal of civil engineering Vol.2 No.1

Formulation of Dynamic Vehicle-Bridge Interaction Problems

Yi, Gyu-Sei Korean Society of Hazard Mitigation 2002 한국방재학회지 Vol.2 No.4

In this papers, a finite element formulation is proposed for dynamic analysis of vehicle-bridge interaction problems under realistic loading conditions. Although the formulation presented in this paper is based on the consideration of only a single traversing vehicle, it can be extended to include several different bridge configurations. The traversing vehicle and the vibrating bridge superstructure are considered as an integrated system. Hence, although material and geometric nonlinearities are excluded, this introduces nonlinearity into the problem. Various vehicle models, including those with suspension systems, are considered. Traveling speed of the vehicle can be varied. The finite element discretization of the bridge structure permits the inclusion of arbitrary geometrical configurations, and surface and boundary conditions. To obtain accurate solutions, time integration of the equation of vehicle-bridge motion is carried out by using the Newmark method in connection with a predictor-corrector algorithm.

권두언

이규세 ( Gyu Sei Yi ) 한국복합신소재구조학회 2014 복합신소재학회논문집 Vol.5 No.1

권두언

이규세 ( Gyu Sei Yi ) 한국복합신소재구조학회 2013 복합신소재학회논문집 Vol.4 No.2

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.

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.