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신재철,남기수,정인수,한성호 충남대학교 산업기술연구소 2001 산업기술연구논문집 Vol.16 No.1
The cable-stayed bridges are composed of cables, towers and girders. when the cable-stayed bridges are loaded, the whole structure display very complex behavior due to excessive cable deflection. Eventhough the material in the members of a cable-stayed bridge structure behaviors in a linear elastic manner. the overall load-displacement relationship for the structure will be nonlinear. The nonlinear behavior is a result of: due to the sag caused by their own dead weight and the nonlinear axial and bending force-deformation relationships for the bend members. In the construction stage analysis, some technical approaches and structure safety are needed to stimulate numerically the complicated changes of structural system during construction. In this study static and construction stage analysis is performed and compared. Static and construction stage analysis on unsymmetric Cable-stayed bridge is performed and linear and nonlinear analysis is performed to evaluate the structure characteristics. After Static analysis of final construction stage was performed, construction stage analysis was performed.
동하중을 받는 FRAME 구조물의 확률유한요소해석 및 신뢰성해석
신재철,김진홍,정인수,한성호 충남대학교 산업기술연구소 2003 산업기술연구논문집 Vol.18 No.1
Most dynamic systems have various random properties in excitation and system parameters. Therefore, in this paper, reliability analysis for structural response is proposed fro the linear dynamic system with random properties in both excitation and system parameters. The system parameters and responses with random properties are modeled by the perturbation technique. A displacement and bending moment of frame structure is acquired in Stochastic Finite Element Method Program(SFEMP) and Dynamic Stochastic Finite Element Method Program(DSFEMP) using perturbation method, and Direct Monte Carlo Simulation Program(DMCSP) is used to verify and compare previous results. Comparing outputs of SFEMP and DSFEMP with them of DMCSP, it show that they are similar to each other. Also DMCSP need much time to analyze a complicated structure, but SFEMP and DSFEMP can reduce quite time. In this study, it is assumed that excitations, system parameters and response are Gaussian. The results of response for the analysis are compared to those of numerical simulation. Also the probability of failure are calculated for using Advanced First Order Second Moment(AFOSM) of the general reliability analysis method.
신재철,정성진,정인수,한성효 충남대학교 산업기술연구소 2004 산업기술연구논문집 Vol.19 No.1
The nuclear containment structure prevent leaking of the radiation during a loss of coolant (LOCA). In case LOCA, the nuclear containment structures are swelled with internal pressure. Thus the wall of the containment behaves itself like the membrane. In the analysis of the nuclear containment structure, the tension stiffening effect is important part of the nonlinear analysis because the wall is failed by tension force. Biaxial tension test of reinforced concrete panel members modeling a nuclear power plant containment wall members were conducted to investigate the cracking behaviors with regard to the reinforcement ratio and tensile load ratio. This paper is aimed at the investigation of behaviors of the concrete wall panels which are the partial of the reinforced concrete containment walls, and derivation of the stress-strain relation of concrete and reinforcement regarding the variables of reinforcement ratio and tensile load ratio. Panels are investigated the influence of the Hsu-Zhang tension stiffening model. The results from this study would make it possible to predict the cracking stress of concrete reinforcement building by analytical methods regarding Hsu-Zhang tension stiffening model
BIM기반 NATM 터널 설계 지원 자동화 프로그램 개발
신재철,백유진,윤영만,이희영,이상규 한국도로학회 2021 한국도로학회지 Vol.23 No.3
PURPOSES : In this study, a Design Support Automatic Program for NATM (new Austrian tunneling method) tunnels based on BIM that can generate shape information including property information via the development of BIM libraries and the construction of a library design support automatic program is developed. METHODS : In this study, the abovementioned program is developed as an add-in Revit program. AutoDesk's program has the highest utilization rate, and it allows support tools to be added easily. Construction information classification based on WBS(Work Breakdown Structure) is developed. Subsequently, library construction and program development algorithms are developed. RESULTS : The automatic program constructs a library that reflects geometric characteristics through the construction of a library automatic module as well as generates three0-dimensional (3D) shape information by mapping between the constructed library and 3D informal alignment. The proposed program can automatically assemble a constructed library through the development of an algorithm for generating sequences of 3D shape information and automatically place models on a 3D terrain. CONCLUSIONS : The proposed automatic program can be designed and changed easily. It is expected to contribute to improvements in the speed of 3D NATM tunnel modeling and the efficiency of NATM tunnel design.
제2 언어/외국어 학습에서의 피드백과 오류 교정에 관한 고찰
신재철 공주교육대학교 초등교육연구원 2012 敎育論叢 Vol.49 No.1
본 연구의 목적은 제2 언어/외국어 학습에서, 학생에 대한 교사의 (i) 피드백과 오류교정의 유형을 고찰하고, (ii) 피드백과 오류 교정의 효과 및 문제점을 고찰하여 초등영어 담당교사에게 제공할 수 있는 효과적인 피드백의 지침을 마련하여 제시하는데 있다. 연구 결과에 따른 몇 가지 지침을 제시하면 다음과 같다. (a) 교사는 오류를 범한 학습자의 개별적인 성향(학습능력, 나이, 감 정상태)에 맞는 오류교정 방법을 사용해야 한다. (b) 교사는 학습과업의 목적(예: 정확성에 중점을 둔 언어의 특징적인 자질 과업 혹은 유창성에 중점을 둔 창의적인 언어사용 혹은 의사소통 과업)에 맞춰 피드백의 유형을 선택해야 한다. (c) 교사는 될 수 있 는 한, 학생을 오류 교정 과정(자아-교정전략 및 자아-발견 전략)에 참여시켜야 한다. (d) 교사는 교정 피드백이 동질화될 때 까지 연속적으로 교정 피드백을 제공해야 한다.