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최진유,양기재,박남회,강영종 한국전산구조공학회 2000 한국전산구조공학회논문집 Vol.13 No.1
교량 바닥판 설계에 대한 현 시방규정은 바닥판 슬래브가 처짐이 구속된 거더에 연속 지지되어 있다고 가정하므로, 바닥판 지간 중앙의 정모멘트와 거더 상단에 발생하는 부모멘트의 크기가 같은 것으로 간주하고 있다. 그러나 바닥판에 발생하는 휨모멘트는 거더의 처짐에 의해서 많은 영향을 받고 있으며, 거더의 처짐을 고려치 않는 현 시방규정에 의해 설계된 바닥판은 상부철근의 부식으로 인한 내구성 저하와 유지보수 비용 증가 등의 문제점을 안고 있다. 따라서 본 연구에서는 매크로 요소를 이용해 거더의 처짐 효과를 고려할 수 있는 해석법을 개발하였고, 이를 유한요소법을 통해 검증하였다. 또한, 이 해석법을 바탕으로 바닥판의 횡방향 휨모멘트에 영향을 미치는 여러 변수에 대한 분석을 수행하였다. 해석 결과, 바닥판의 지점부 모멘트는 거더의 간격뿐만 아니라 거더와 바닥판의 휨강성비 교량의 길이, 하중의 재하위치, 거더의 비틀림 강성, 가로보의 휨강성과 배치 간격 등에 많은 영향을 받고 있는 것을 알 수 있으며, 영향선을 이용해 최대하중 위치를 결정하여 몇 개의 예제교량을 대상으로 지점부의 설계모멘트를 계산해 본 결과, 현 시방규정이 다소 보수적인 값을 나타내고 있다. Current specification prescribes that upper and lower reinforcement mat is required in the same amount to resist negative and positive moment in bridge decks. But the negative moment is much smaller than positive moment because the actual behavior of decks consists of local deflection of slab and global deflection of girder. From this study, the analysis method based on harmonic analysis and slope-deflection method was developed and verified by finite element method. The negative moment, obtained from this method, were smaller than those computed based on the KHBDC specifications as much as 40∼50% in the middle of bridge. The amount of reduction of the design negative moment was shown herein to be dependent on variable parameters as shape factor(S/L) of slab, relative stiffness ratio of girder and deck slab, and so on. This investigations indicate that the upper reinforcement mat to resist negative moment can be removed. But further experimental study is required to consider durability and serviceability. From this new design concept, the construction expense can be reduced and the problem of decreasing durability resulting from corrosion of upper reinforcement steel settled.
철도시설물 유지보수 공정에 따른 보건과 환경 측면에서의 유해요인 도출에 관한 연구 – 시설, 전기분야를 중심으로 –
최진유,염병수,갈원모 대한설비관리학회 2023 대한설비관리학회지 Vol.28 No.3
Various occupational disease problems of railway maintenance workers have been continuously raised, but due to the characteristics of railway facility maintenance work different from the other transportation industry, there were a lot of difficulties in managing occupational diseases comprehensively considering health and environment. Through the work environment analysis, environmental and health hazards that may occur to railway maintenance workers were derived. The derived hazards can be summarized as dust, noise and vibration, musculoskeletal disorders, heat-related disorders, harmful chemicals, ventilation, heat waves, and ultraviolet exposure. In addition, measures were proposed for railway maintenance workers to prevent occupational diseases caused by these hazards. The results of this study can be used as basic data for system establishment that can comprehensively consider health, environment, and safety.
철도종사자의 안전도 향상을 위한 HSE영역의 위험요인 도출에 관한 연구
최진유 ( Jinyu Choi ),박찬우 ( Chanwoo Park ),염병수 ( Byeoung Soo Yum ) 대한설비관리학회 2021 대한설비관리학회지 Vol.26 No.4
The railway safety in Korea is improving to the level of advanced countries by the development of railway safety technology, the introduction of advanced systems, and continuous interest and budget investment from government, etc. However the safety level of railway staffs is still not improved compared to the improvement of the safety level in the railway sector. In this study, basic research was conducted to introduce a staff safety management system that comprehensively considered health-safety-environment (HSE) in order to improve the safety level of staffs in the railway field. The working area in railway is divided into sales, passenger service, vehicle maintenance, infra structure maintenance, and electric facility maintenance. And also the risk factor for each working area is derived for the health area, the safety area, and the environment area. In addition, in order to improve the understanding of the application of HSE, some examples of deriving risk factors in the HSE area for each work area for a light rail worksites. Finally, a plan for expanding HSE application to improve the safety of railway staffs was suggested.
레티스형 바이블럭 철근콘크리트 침목 표준 제정을 위한 요구조건 도출 연구
최진유(Jinyu Choi),윤기용(Ki-Yong Yoon),문지호(Jiho Moon) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.1
레티스형 바이블럭 철근콘크리트 침목(이하 레티스형 바이블럭 침목)은 현장타설형 콘크리트 궤도에 널리 적용되고 있다. 하지만, 레티스형 바이블럭 침목이 현장타설형 콘크리트 궤도의 중요한 구성요소임에도 불구하고 제작, 검사 및 시험을 위한 표준은 미흡한 상태이며 이에 대한 표준 제정이 필요한 실정이다. 본 연구는 문헌조사를 통하여 레티스형 바이블럭 침목의 표준 제정에 필요한 요구사항을 도출하는데 연구의 목적이 있다. 이를 위하여 국내외의 관련 표준들을 비교 분석하여 시사점을 도출하고 이를 바탕으로 레티스형 바이블럭 침목 표준 제정에 필요한 요구사항들을 도출하여 제안하였다. Lattice-type bi-block reinforced concrete (RC) sleepers have been widely used for cast-in-place concrete slab tracks. However, the standards for manufacturing, inspection, and performance verification of the lattice-type bi-block RC sleepers are not well established, even when such a sleeper is a critical component of the cast-in-place concrete slab track. Therefore, it is necessary to develop a new standard for lattice-type bi-block RC sleepers. In this study, the requirements for the relevant standard were investigated through literature review. Domestic and international standards pertaining lattice-type bi-block RC sleepers were summarized and compared with each other. Consequently, the requirements for standard establishment were proposed.
교량신축과 분기기의 이격거리에 따른 교량상 분기기 축력특성 연구
최진유(Choi Jin-Yu),이현정(Lee Hyun-Jeong),양신추(Yang Shin-Chu),정장용(Jeong Jang-Yong),유진영(Yu Jin-Young) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The demand on a turnout layed on a bridge is rising owing to the increasing number of stations on the viaduct. And also the demand on a turnout with CWR is rising to upgrade running speed of the passing train. A CWR with turnout is subjected to additional axial force induced by the thermal expansion of bridge as well as lead rail of turnout. The additional axial force is closely related with the distance between bridge expansion joint and turnout when it is located near the movable bearing of bridge, and it is required to keep some distance to prevent excessive axial stress in CWR. But, there is no guideline in specification for the proper distance from E.J. to turnout, and it caused problem in planning turnout or bridge. So, it this study, the parametric study to investigate the effect on axial stress in CWR with turnout according to span length and distance between bridge expansion joint and turnout was performed. From the results of numerical analysis, it was found out that 5~30m distance is required to prevent excessive axial in CWR for span length less 90m.