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- 저자 : 김경윤 ( Gyeoung Yun Kim ) (검색결과 6 건)
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시스템 동바리의 수직재와 수평재 연결부 경계조건에 따른 거동 분석
김경윤 ( Gyeoung Yun Kim ),원정훈 ( Jeong-hun Won ),김상효 ( Sang-hyo Kim ) 한국안전학회 2017 한국안전학회지 Vol.32 No.3
This study examined the effect of rotational stiffness of joints between vertical and horizontal members in system supports. In order to prevent repeated disasters of system supports, it is important to examine the accurate behavior of system supports. Among various factors affecting the complex behavior of system supports, this study focused on the stiffness of joints between vertical and horizontal members. The considered joint was modelled by a rotational spring, but the translational displacements were fixed. The stiffness of rotational spring was calculated by utilizing the usable experimental data. In addition, the hinge connection condition, which is generally considered in design and only restrict the translational displacements, was modelled to compare the results. The case with the rotational stiffness in joints showed 3.5 times buckling loads compared to the case without the rotational stiffness. Thus, the structural behavior of the vertical member in system supports was similar to the vertical member with the fixed condition. For the combined stresses of vertical members, the combined stress ratios were reduced 5~6% by considering the rotational stiffness of connecting parts. However, for the horizontal member where showed relatively small stress range, the stresses were increased 2.3~7.6 times by considering the rotational stiffness in connecting parts.
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일부타정식 케이블 시스템 장경간 사장교의시공 중 동적 안전성 분석
원정훈 ( Jeong-hun Won ),김경윤 ( Gyeoung Yun Kim ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.4
The effect of a partially earth anchored cable system on the structural safety of a long span cable-stayed bridge under seismic and wind loads are examined during construction process. By assuming the FCM (free cantilever method) construction stages with structural vulnerability, a multi-mode spectral analysis and a multi-mode buffeting analysis are performed for specific seismic load and wind load, respectively. Results show that the wind load dominates the structural safety of a cable-stayed bridge during construction. And, the application of a partially earth anchored cable system can enhance structural safety under wind load since the maximum pylon moment in the model with partially earth anchored cable system is reduced by 49% under wind load. In contrast, the maximum pylon moment occurred by seismic load is only decreased by 8%.
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시스템 동바리 구조 안전성에 대한 최소 수평하중의 영향
정대현 ( Dae Hyun Chung ),김경윤 ( Gyeoung Yun Kim ),원정훈 ( Jeong Hun Won ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.5
This study examined the effects of the minimum horizontal load on the structural behaviors and safety of system supports. The minimum horizontal load was frequently ignored in the design of system supports even though the level of that load was specified in the code and guide in Korea such as ‘Standard Specification in Temporary Construction’ and ‘Guide to Installation of Shores for a Concrete Bridge’. To examine the effects of considering the minimum horizontal load, the finite element analysis were performed for various system supports. By varying installing parameters of system supports such as the vertical member spacing, the installation height, and the thickness of slab, the maximum combined stress ratios were estimated to investigate the structural safety of system supports. The results showed similar axial stress in vertical members but an increase in bending stress with a consideration of the horizontal load. The combines stress ratios are remarkably increased due to the consideration of the horizontal load. Consequently, the system supports, which were initially estimated to be safe when only the vertical loads were considered, were changed to be unsafe in most cases by the effects of the both the vertical and horizontal stresses. Therefore, the minimum horizontal load following the code and the guide is an essential load that could control the structural safety of system supports.
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시스템 비계의 수직재와 수평재 결합용 포켓형 연결부의 회전강성 추정
장남권 ( Jang Nam-gwon ),강민국 ( Kang Min-guk ),김경윤 ( Kim Gyeoung-yun ),윤영철 ( Yoon Young-cheol ),원정훈 ( Won Jeong-hun ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.1
시스템 비계 설계 시 수직재와 수평재 연결부는 일반적으로 설계기준에 따라 단순 힌지로 가정하고 있으나, 실제 연결부는 회전강성을 가지고 있다. 연결부는 시스템 비계의 수직부재와 수평부재 간 연결 형태에 따라 회전강성의 차이가 존재하나, 시스템 비계의 다양한 연결부 형태 중 널리 사용되는 포켓형 연결부의 회전강성에 대한 연구는 미흡한 실정이다. 본 연구에서는 해석 및 실험을 통해 시스템 비계의 수직재와 수평재를 연결하는 포켓형 연결부의 이선형 회전강성 모델을 제안하였다.
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영국 CDM규정과 사례 분석을 통한 건설공사 발주자의 안전관리 필요성에 대한 연구
원정훈 ( Jeong Hun Won ),이형도 ( Hyung Do Lee ),김경윤 ( Gyeoung Yun Kim ),임세종 ( Se Jong Lim ) 충북대학교 건설기술연구소 2015 建設技術論文集 Vol.34 No.1
본 연구에서는 건설공사 발주자의 안전관리 역할의 필요성과 효과에 대해 국내 와 관련규정, CDM 2015, 그리고 국내·외사례를 통하여 분석하였다. 산업안전보건법에서는 발주자의 정의가 명시되어 있지 않아 안전·보건에 대한 발주자의 책임을 물을 수 없는 것이 현살이며, 건설공사 안전관리 매뉴얼에 발주자의 역할과 책임이 제시되어 있지만 법적 구속력이 없다. 또한, 발주자 대신에 현장을 책임지는 건설사업관리기술자(감리자)는 안전·보건 분야의 전문 기술과 경력 등을 갖고 있지 않은 경우가 대부분이다. 발주자의 안전관리 필요성에 대한 다양한 연구자들의 결과는 건설공사 관련자들 대부분이 발주자익 안전관리 필요성의 중요성을 인지하고 있는 것으로 조사되었다. 영국의 경우, CDM 규정 시행 이후 평균 중대 안전사고 만인율의 크게 감소되었으며, 서울시의 경우 최근 자율적으로 수행하고 있는 발주자 선도의 안전관리제도로 2014년도 재해율이 전년도 대비44% 가량 감소되었다. 따라서 국내 발주자의 안전관리 역할과 책임을 제도적으로 명시하는 방향으로 제도를 개선하여 산업재해예방을 감소시킬 필요가 있다고 판단된다. This study analyzed the necessity and effectiveness of domestic client``s safety management in construction through investigation related regulations in Korea, CDM 2015 of United Kingdom, case studies. Since occupation safety and health acts in Korea do not define clearly the meaning of the client in construction work, construction clients were not authorized to prevent accidents at sites. Although the roles and responsibility of clients were presented in safety management manual for construction, it has no legal binding force. In addition, CM managers were not experts in construction safety management. Most researches showed that client``s safety management is needed to reduce accidents in construction sites. In United Kingdom, the death rate of workers was reduced after carrying out the CDM regulation. In Seoul, the accident rate was reduced about 44% by operating the voluntary safety management system of Seoul metropolitan government. Thus, it is need to specify the construction client``s roles and responsibility for safety management in domestic regulation to prevent accidents in construction sites.
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