프리텐션 방식의 PSC 거더 이동식 제작장치 개발에 관한 실험적 기초연구

이규세,윤기용,김종석,김용혁 한국방재학회 2011 한국방재학회논문집 Vol.11 No.6

In general, pretensioning PSC members are manufactured at the factory. To assemble, they are transported to the site. Due to road conditions, their size is limited. Therefore, until now pretensioning method is only applied to small PSC members. In order to produce large scale PSC members using pretensioning method, they shall be made on site. In this study, a portable prestressing device to produce pretensioning PSC girders on site has been developed. In order to develop a portable prestressing device it shall be safe and stable about jacking force. In this paper, the portable prestressing device to produce 10 m-span pretensioning PSC girders was made. The static loading test was performed to analyze the resisting mechanism of each component of that device. The jacking force was introduced by stretching and anchoring the tendons at its both ends. In the static loading test, the structural characteristics of the developed device are investigated. 현재 사용되는 프리텐션 방식의 PSC 부재는 공장에서 제작, 운반하여 현장에서 가설하는 방식이므로, 도로주행 여건에 의해운반 가능한 부재의 크기가 제한된다. 따라서 현재까지 소규모 PSC 부재에만 프리텐션 방식이 적용되고 있다. 이에 본 연구에서는 현장에서 프리텐션 방식으로 PSC 거더를 제작할 수 있는 이동식 긴장대를 개발하고자 한다. 개발하고자 하는 이동식 긴장대에는 큰 긴장력에 대한 안전성과 안정성을 갖추어야 한다. 본 논문에서는 10 m 정도의 프리텐션 방식의 PSC 거더를 생산할 수 있는 이동식 긴장대를 제작하였다. 정적하중재하 실험을 통하여 작용하는 긴장력에 대하여 각 구성요소가 긴장력에 저항하는 메카니즘을 분석하여 개발하고자 하는 이동식 긴장대의 구조적 특성을 파악하고자 하였다.

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.

건설분야에서의 복합신소재 이용기술 -복합신소재 바닥판을 중심으로-

이규세,박원태,Yi, Gyu-Sei,Park, Won-Tae 한국복합신소재구조학회 2010 복합신소재학회논문집 Vol.1 No.1

연성 방호구조물의 입력변수에 대한 동적 퍼포먼스 민감도 분석

이규세 한국방재학회 2010 한국방재학회논문집 Vol.10 No.3

To evaluate the performance of safety apparatus without the full scale crash test, the computer simulation is inevitable. But, to improve the accuracy of computer simulation, it is important to reasonably determine the input parameters in which the interaction of vehicle-guardrail-soil should be accounted for. This study is focused on how to enhance the reliance of the dynamic performance of guardrail obtained by computer simulation. Analyses were done on the sensitivity of output variables to the change of input parameters by using BARRIER VII of which the usefulness was proved on the barrier-vehicle impact analysis. Through the analyses important input parameters, which give sensitive effects to output of computer simulation, are found out, and methods to determine such parameters are suggested to improve the accuracy of simulation. 실물 충돌 실험을 실시하지 않고 하는 안전구조물의 성능 평가는 컴퓨터 해석에 의한 검토가 불가피하다. 그러나 이러한 컴퓨터 시뮬레이션의 정확도를 높이기 위해서는 연성방호구조물의 차량-가드레일시스템-지반의 상호작용을 고려한 특정 입력변수의 올바른 결정이 중요하게 된다. 본 연구에서는 가아드레일로 대표되는 연성방호구조물의 동적 퍼포먼스를 컴퓨터 시뮬레이션으로 측정하되, 시뮬레이션의 정확도를 높이기 위한 방안을 도출하기위하여 구조물․차량의 충돌 해석에 유용성 이 입증된 Barrier Ⅶ 프로그램을 이용하여 입력변수에 대한 출력변수의 변화 양상을 분석함으로써 안전성검토에 있어서 중요한 입력변수를 도출하고 정확한 입력변수를 결정하기 위한 방안을 제시하였다.

섬유 보강 재료를 위한 이방성 소성모델

이규세 한국복합신소재구조학회 2014 복합신소재구조학회 학술발표회 Vol.2014 No.04

An orthotropic 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 composite laminates. An orthotropic initial yield criterion, as well as work-hardening model and subsequent yield surface are established that includes the effects of different yield strengths in each material direction, and between tension and compression. The current model is 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. 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.

프리캐스트 바닥판 이음부의 차량 윤하중에 대한 가속도 특성 분석

이규세 한국복합신소재구조학회 2019 복합신소재구조학회 학술발표회 Vol.2019 No.04

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.

우리 학회의 첫 해를 돌이켜 보며

이규세 한국복합신소재구조학회 2010 복합신소재학회논문집 Vol.1 No.4

실태조사를 통한 연안역 안전의 문제점 및 개선방향에 관한 소고-안전기준

이규세,성익현,배상원,임남형 한국방재학회 2011 한국방재학회논문집 Vol.11 No.2

Recently, the risk of safety accidents in the coastal zone has been increased due to revitalization of marine leisure and tourism. The effective measures, however, to prevent safety accidents in the coastal zone have not taken with increasing rate of the accidents. The nature of land and sea should be taken into account properly when the countermeasures to prevent the safety accidents in the coastal zone are devised, since the characteristics of land and sea are mixed in the environmental condition of the coastal zone. Through the field survey, this study analyzes the current problems on the safety in the coastal zone. Also, it suggests the future direction of the safety standards in the coastal zone on the basis of the safety improvement direction in the coastal zone. 최근 해양 레포츠와 관광의 활성화로 연안역에서의 안전사고 위험은 더욱 증가하고 있다. 그러나 연안역 안전사고를 방지하기 위한 대책이 안전사고의 증가속도에 적절하게 대응하지 못하고 있다. 연안역의 환경은 육역과 해역의 특성이 혼재된 복합 환경조건이므로 연안역 안전사고 대책방안 수립 시에는 육역과 해역의 특성이 적절히 고려되어야 한다. 본 논문에서는 현장실태조사를 통해 연안역 안전에 대한 현 문제점을 분석하였으며 연안역 안전의 개선방향을 근거로 연안역 안전기준 정립방향을 제안하였다.

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.