온도 효과를 이용한 일부 타정식 사장교의 키-세그먼트 폐합법

원정훈,윤지현,조광일,김상효,Won, Jeong Hun,Yoon, Ji Hyun,Cho, Kwang Il,Kim, Sang Hyo 한국강구조학회 2008 韓國鋼構造學會 論文集 Vol.20 No.1

본 연구에서는 FCM 공법으로 건설되는 사장교의 최종 시공 단계인 키-세그먼트 폐합 방법으로 기존의 set-back과 reset-back 방법 대신 온도 효과를 이용한 폐합방법을 제안하여, 이를 일부 타정식 사장교에 적용하였다. 제안된 방법은 키-세그먼트 폐합 전 캔틸레버 상태인 교량 시스템의 중앙 경간부 거더 내부에 인위적인 가열 작업을 하여 거더를 신장시킨 후 키-세그먼트 폐합 후 연속교 상태에서 가열을 제거하는 방법으로, 가열 작업과 가열 제거 작업시의 시스템 변화를 이용하여 교량 시스템에 인위적인 부재력을 발생시키는 방법이다. 기존의 자정식 사장교를 일부 타정식 사장교로 변경 후 시공단계 해석을 수행한 결과, 인위적으로 발생된 부재력은 일부 타정식 사장교의 구조 시스템 특징에 부합하여 거더부의 압축력을 감소시키므로 제안된 방법은 일부 타정식 사장교에 효과적으로 적용될 수 있는 것으로 판단된다. study proposes a new key-segment closing method using thermal effect as a substitute to the process of set-back and reset-back for the FCM construction of a partially earth-anchored cable-stayed bridge. The proposed method is to artificially heat up the inside of girders located in the main span before closing the key-segment in a cantilever state. Then, the heat is removed after finishing the closure in a continuous bridge state. Using the changes in boundary conditions and structural systems, the proposed method can generate new member forces that reflect the advantage of the partially earth-anchored cable system. From the construction sequence analysis, it is found that the proposed method increases the efficiency of a partially earth-anchored cable-stayed bridge by reducing the compressive axial forces on the girders.

스마트건설안전 비용의 안전관리계획서 계상 현황 분석을 통한 활성화 방안 연구

원정훈,장남권,유지영,Won, Jeong-Hun,Jang, Nam Gwon,Yu, Ji Young 한국안전학회 2022 한국안전학회지 Vol.37 No.3

This study analyzed the smart construction safety cost included in safety management plans that are approved before construction. Specifically, it refers to the cost incurred in constructing and operating a safety management system using wireless communication and facilities. Based on the obtained statistical results, an activation policy for the inclusion of the smart construction safety cost in building safety management plans was proposed. The smart construction safety cost must be included in the safety management cost; notably, this is mandated by the Construction Technology Promotion Act. However, there are some problems with the inclusion of smart construction safety costs. To analyze the problems encountered when calculating the smart construction safety cost and including it in safety management plans, in this study, statistical analysis was performed using the data of 1,334 safety management plans received at the Construction Safety Management Integrated Information (CSI) from June to August 2021. The results show that only 50.7% of the safety management plans included the smart construction safety cost although the current law mandates 100% inclusion of these costs. Thus, it is apparent that the smart construction safety costs are only included in a low proportion of sites. In addition, the calculated smart construction safety costs were shown to have a small correlation with the construction cost; moreover, they appeared to be distributed at a constant cost level. In this context, it is believed that perfunctory cost calculations were performed at most sites since the effect of the construction cost on the smart construction safety cost was negligible. Therefore, it is necessary to improve the inclusion of smart construction safety costs by strengthening the authorization process of the approval institute of safety management plans. In addition, institutional support, such as guidelines that promote the calculation and inclusion of appropriate smart construction safety costs according to the characteristics of sites, are needed.

강-PSC 복합구조 거동 향상을 위한 연결부 제안 : 실험적 연구

원정훈(Won Jeong-Hun),윤지현(Yoon Ji-Hyun),오가욱(Wu Jia Xu),김상효(Kim Sang-Hyo),이찬구(Lee Chan-Goo),김성재(Kim Sung-Jae) 대한토목학회 2008 대한토목학회 학술대회 Vol.2008 No.10

시스템 동바리 수직재와 수평재 연결부의 휨강도와 회전 강성 평가

원정훈 ( Jeong-hun Won ),이형도 ( Hyung Do Lee ),최명기 ( Myeong-ki Choi ),박만철 ( Man Cheol Park ) 한국안전학회(구 한국산업안전학회) 2018 한국안전학회지 Vol.33 No.4

This study examined the maximum resistant moment and nonlinear rotational stiffness of wedge joint between the vertical and horizontal members of system supports. To examine the maximum resistant moment and propose the nonlinear rotation stiffness of wedge joint, 6 specimens were tested and additional 3 specimens, where the horizontal member was welded to the vertical member, were tested to compare the moment capacity of wedge joints. The average maximum moment in the tested wedge joint was 1.183 kNm which represented about 70 % of the maximum moment developed in the welded specimens. And, as simulating nonlinear rotational stiffness of the wedge joint, a tri-linear model was suggested. The rotational stiffness was estimated as 23.095 kNm/rad in first stage, 7.945 kNm/rad in second stage, and 3.073 kNm/rad in third stage. For the failure mode, the specimen with the wedge joint showed the failure of joint between vertical and horizontal members. However, the specimen with welded joint represented the yielding of horizontal members.

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.

최근 10년간 국내 건설업 재해 특성 분석

원정훈(Jeong Hun Won),이형도(Hyung Do Lee),송규진(Song Kyu Jin),정성훈(Sung Hoon Jung) 한국방재안전학회 2016 한국방재안전학회 학술대회 논문집 Vol.2016 No.-

본 연구에서는 최근 10년간 발표한 고용노동부의 산업재해 현황분석자료를 분석하여 건설업과 제조업의 재해율 변동 추이, 건설업의 월별, 요일별, 재해형태별 등 재해통계를 상세하게 비교·분석하였다. 통계자료를 분석한 결과 전 산업의 재해율은 2006년부터 최근까지 지속적으로 감소하며, 업종별 재해율과 사망만인율을 분석한 결과 사망만인율은 제조업과 건설업 모두 감소한 반면, 재해율의 경우 제조업은 감소하였고 건설업은 2008년 이후 꾸준히 증가하는 것으로 분석되었다. 규모별 분석 결과 “50인 미만 사업장”에서 재해율과 사망만인율이 상당 부분 발생하였으며, 연령별 재해자 비율을 분석한 결과 고령 근로자의 재해자 비율이 점점 높아지는 것으로 분석되었다. This study analyzed the occupational injury materials from ministry of employment and labor reserved during last ten years. By estimating accident statistics such as variation of annual accident rates, monthly and daily accident rates, and accident types, the accident characteristics of construction and manufacturing industries were compared in order to study the fundamental accident prevention methods in the construction industry. Results showed that the fatal rates in all industries tended to be decreased since 2006. However, the fatal rates of construction industry was higher than manufacturing industry. For accident rates, the construction industry revealed the increased trend while manufacturing industry showed the continuous decrement of accident rates. The result of site scale and worker s age in construction site revealed that the accidents over 80% were occurred in the small scale site and the accident rates of the aged workers were increased steadily.

건설기술진흥법 개정에 따른 가설구조물 안전성 확보

원정훈(Jeong-hun Won),허원석(Wonsuk Heo) 한국강구조학회 2016 韓國鋼構造學會誌 Vol.28 No.1

온도 프리스트레싱 효과를 이용한 일부 타정식 사장교의 폐합방법

원정훈(Won Jeong-Hun),Ochirderi Altanzagas,윤지현(Yoon Ji-Hyun),김상효(Kim Sang-Hyo) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10

Perfobond rib을 적용한 PSC-강 복합구조 연결부 거동에 대한 실험적 연구

원정훈(Won, Jeong-Hun),박세준(Park, Se-Jun),윤지현(Yoon, Ji-Hyun),김상효(Kim, Sang-Hyo),이찬구(Lee, Chan-Goo),김성재(Kim, Sung-Jae) 한국콘크리트학회 2008 한국콘크리트학회 학술대회 논문집 Vol.2008 No.11

장경간 사장교에 적용된 일부타정식 케이블 시스템의지진하중과 풍하중 안전성 향상 효과 분석

원정훈 ( Jeong-hun Won ),이형도 ( Hyung Do Lee ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.4

This study investigates effects of partially earth anchored cable system on the structural safety for a long-span cable-stayed bridge under dynamic loads such as seismic and wind load. For a three span cable-stayed bridge with a main span length of 810 m, two models are analyzed and compared; one is a bridge model with a self anchored cable system, the other is a bridge model with a partially earth anchored cable system. By performing multi-mode spectrum analysis for a prescribed seismic load and multi-mode buffeting analysis for a fluctuating wind component, the structural response of two models are compared. From results, the partially earth anchored cable system reduce the maximum pylon moment by 66% since earth anchored cables affect the natural frequencies of girder vertical modes and pylon longitudinal modes. In addition, the girder axial forces are decreased, specially the decrement of the axial force is large in seismic load, while girder moment is slightly increased. Thus, the partially earth anchored cable system is effective system not only on reduction of girder axial forces but also improvement of structural safety of a cable-stayed bridge under dynamic loads such as seismic and wind loads.