http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
Structural Effects of Partially Earth-anchored Cable System on Medium-span Cable-stayed Bridges
원정훈,박세준,윤지현,김상효 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.3
The aim of this study is to examine the structural effects of the partially earth-anchored cable system on cable-stayed bridges with medium main span length (between 150 and 500 m). It is assumed that the system, originally introduced as a means of reducing excessive axial force in the girder of long-span cable-stayed bridges, can be applied to medium-span cable-stayed bridges. By simulating two types of three-span cable-stayed bridges, one with the self-anchored cable system and the other with the partially earth-anchored cable system, advantages and disadvantages of the partially earth-anchored cable system are estimated. The system enhances structural behaviors for the axial force in the girder, the bending moment in the pylon, and the uplifting force at the bearing. Also, partially earth-anchored cable stayed bridges with the various numbers of earth-anchored cables are analyzed by a parametric study. The major considerations in determining the optimal proportion of earth-anchored cables is recommended.
Seismic Behavior Analysis of a Plate-Girder Bridge Considering Abutment-Soil Interaction
원정훈,Jia Xu Wu,김상효,마호성 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.4
Longitudinal dynamic behaviors of a multi-span plate-girder bridge under seismic excitations are examined to see the effect of the abutment-soil interaction. The stiffness degradation due to the abutment-soil interaction is considered in the system model, which may play the major role upon the global dynamic characteristics of the whole bridge system. An idealized mechanical model is proposed, which is capable of considering pounding phenomena, friction at the movable supports, and the corresponding simulation method is developed. The abutment-soil interaction is modeled as the one degree-of-freedom system with nonlinear spring and damper. Using the idealized mechanical model for the bridge system, the longitudinal responses of stiffness degradation model are compared with those based on the linear system, which excludes the stiffness degradation. Results show that the stiffness degradation of the abutment-backfill system takes an important influence upon the global bridge motions and the seismic responses may be underestimated in the system only with the constant stiffness considered. Hence, it is concluded that the stiffness degradation should be taken into account in the seismic analysis of the bridge system. Longitudinal dynamic behaviors of a multi-span plate-girder bridge under seismic excitations are examined to see the effect of the abutment-soil interaction. The stiffness degradation due to the abutment-soil interaction is considered in the system model, which may play the major role upon the global dynamic characteristics of the whole bridge system. An idealized mechanical model is proposed, which is capable of considering pounding phenomena, friction at the movable supports, and the corresponding simulation method is developed. The abutment-soil interaction is modeled as the one degree-of-freedom system with nonlinear spring and damper. Using the idealized mechanical model for the bridge system, the longitudinal responses of stiffness degradation model are compared with those based on the linear system, which excludes the stiffness degradation. Results show that the stiffness degradation of the abutment-backfill system takes an important influence upon the global bridge motions and the seismic responses may be underestimated in the system only with the constant stiffness considered. Hence, it is concluded that the stiffness degradation should be taken into account in the seismic analysis of the bridge system.
건설기술진흥법 개정에 내포된 건설현장 발주자 안전관리 책임 강화
원정훈 ( Won Jeong-hon ),나예지 ( Na Ye Ji ),박기용 ( Park Ki Young ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
This study analyzed the major change of revised Construction Technology Promotion Act in the field of safety management. In order to increase the execution of the system of construction safety management, Construction Technology Promotion Act was revised at the end of 2018. The key issues were founded in the system of safety management plan, regular safety inspection by external professional organization, and irregular safety inspection by clients. By revised law, the role and responsibility of construction clients was enforced and the clients were recognized as leading participants in construction safety management.
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.