선박 건조 과정에서 블록이나 장비를 지지하는 A형 캐리어 구조는 하중 변경과 시간이 지남에 따라 점차 변형이 증가하며, 이 에 따라 블록과 접촉하는 면적이 감소하고 분산된 하중에서 집중된 하중으로 패턴이 변화한다. 이러한 현상은 실제 사용 하중을 오판할 가능성이 있다. 특히 A형 캐리어는 영세한 제조 업체에서 자주 사용하고 있으며, 별도의 엔지니어링 기능이 없는 상황이 대부분이라서 손 쉽게 캐리어의 안전사용하중을 계산하는 방법의 개발이 필요하다. 본 연구는 A형 캐리어가 장기적으로 안전하게 사용할 수 있는 하중을 신속하게 평가하는 방법을 제안함으로써, 하중 분포의 변화에 따른 소성 변형과 그로 인한 안전 문제를 예측하고 대응할 수 있다. 제안된 방법은 캐리어의 중앙 집중하중과 전체 분포하중 조건에 대해서 유한요소해석(빔, 쉘 모델링)을 통한 결과를 기반으로 빔-이론을 수정하 여 제안되었다. 빔 모델링에서 집중하중 조건은 보정계수 0.73, 분포하중에서는 0.69를 이론값에 곱해서 안전사용하중이 가능하다. 쉘 모 델링의 경우, 집중하중은 0.75와 분포하중은 0.69를 사용할 수 있다. 본 연구는 선박 건조 작업 현장의 안전을 개선하고, 실제 작업 환경에 서의 안전 사용 하중 판단에 신속하고 효과적인 결정을 내릴 수 있는 기초 자료로 활용될 수 있다.

This paper proposes a method to evaluate the structural safety of a large wide-width greenhouse structure against wind load caused by a typhoon through a fluid structure interaction analysis technique. The conventional method consisted of roughly estimating the wind load based on the relevant laws and regulations, and determining safety through structural analysis. However, since the wind load changes nonlinearly according to the wind speed distribution and wind direction around the greenhouse and the external shape of the structure, there are many uncertainties in the existing structural safety evaluation method, and it is difficult to accurately determine the design margin. In this study, a systematic method was developed to accurately calculate the wind load acting on a greenhouse structure and evaluate structural safety by considering the characteristics of wind through a fluid structure interaction analysis using coupled computational fluid dynamics and computational structural mechanics. Using the proposed method, it is possible to significantly reduce the manufacturing cost because it is possible to obtain an optimal design that reduces the over-conservative design margin while securing the structural strength of the greenhouse.

본 논문은 버스정류장 미세먼지 저감을 위해 설계된 도로시설물의 성능평가 과정 및 결과를 보고한다. 먼저, 유한요 소해석 프로그램인 LS-DYNA를 이용하여 대상 구조물에 대한 충돌해석이 수행되었다. 해석변수로 차량의 속도와 충돌 위치를 고려한 다양한 조건에서의 구조해석이 진행되었다. 대상 시설물의 성능은 이 결과를 이용하여 구조적 성능과 충돌 후 차량의 안전성능이 평가되었다. 해석결과로부터 충돌속도가 증가하고 충돌위치가 전면으로 갈수록 시설물의 구조성능과 차량의 충돌 후 안전성능이 저하되는 것이 콘크리트의 손상량을 통해 확인되었다. 더불어 충돌 후 차량의 거동에 대한 분석을 통해 시설물에 연속되는 연석이 설치되면 차량의 이탈을 방지해 안전성능을 확보하는 것으로 예측되었다. 최종적으로, 대상 시설물은 설계 시 고려된 목표 충돌속도 25km/h보다 더 큰 40km/h까지 충분한 안전성능을 확보하고 있다는 것이 확인되었다.

The many parts in the hydraulic equipments subject to load by hydraulic pressure. And some parts which are installed to the inside of the hydraulic equipments subject to load by the hydraulic pressure as well as the fluid speed. The inside of the valve generally generates the flow. Considering the valve expansion or the flow of the large valve, the flow is similar to the fluctuation flow in the opened flow system. In this study, the analysis of the flow including the fluctuation are performed and this results will apply to the optimal shape design of the flow path. The load acting on the structure was analysed according to the change in the shape and flow speed of the structure which install in fluid, and the safety evaluation wad investigated in consideration of the flow speed and the depth of fluid.

Pultruded glass fiber reinforced polymeric plastic (PFRP) and FRP member manufactured by sheet molding compound (SMC) have superior mechanical and physical properties compared with those of conventional structural materials. Since FRP has an excellent corrosion-resistance and high specific strength and stiffness, the FRP material may be highly appreciated for the development of floating-type photovoltaic (PV) power generation system. In this paper, advanced floating PV generation system made of PFRP and SMC is designed. In the design, it includes tracking solar altitude by tilting photovoltaic arrays and tracking solar azimuth by spinning structures. Moreover, the results of the finite element analysis (FEA) are presented to confirm stability of entire structure under the external loads. Additionally, installation procedure and mooring systems in the Hap-Cheon Dam are discussed and the measurement of strain under the actual circumstances is conducted for assuring stability of actually installed structures. Finally, by comparison with allowable stress, appropriate safety of structure is confirmed to operate the system.

The research is to verify by experiments whether the steel truss structure is able to withstand the load of cement bricks of upper part of a door for the safe use of lightweight steel truss structure instead of concrete lintel which is to be installed at upper part of door frame in building cement bricks for apartment construction. The steel truss is designed in order not to disturb bricks-building and the shape of structure was verified by bending test. According to experiments result, camber was applied to steel structure that enabled construction work to be improved and was proved effective for the prevention of accidents by cement bricks-building load test.

Since 1990's, many enterprises have constructed Integration Information System. Especially, they want to become an advanced company use ERP package. Already, ERP system come to high level which is stabilized and support independent business process of many industry sectors. Therefore, important success factors for ERP project are change management and organization activation. Although most companies had previous good plans, but those are not satisfied. Because of failed to change management and discontinued next activity for promotion. This paper studied success factors of project team and plan for organization activation. Also, it proposed next study subject about investigate the role of the member of task force team as a factor that makes the ERP system a success. The results of this study can be used for a successful construction of the ERP system as a solution about internal problems of Project team.

산업재해의 직접적인 원인은 작업자의 불안전한 행동과 작업과정에서의 안전시설 설치미흡으로 인한 불안전한 상태로와 기술적, 교육적, 관리적 원인의 복합적인 형태로 발생되는데 그 가운데 산업안전보건법상의 건설공사 각 공종 별 기술적인 안전시설설치 기준이 건설업 종사자에게 쉽게 적용하기가 현행 법기준에는 문제점이 있으며 이러한 복잡한 법기준을 분석하여 안전사고 예방 기법에 적용하고자 제시하고자하며, 향후에 이를 바탕으로 산업안전보건법상의 안전기준을 체계적으로 분석하여 제시하고자 한다.

잔교식 안벽의 수중부는 접근이 쉽지 않아서 손상확인이 어려운 곳인데, 최근들어 태풍과 지진이 빈번하게 발생하고 있어 잔교식안벽 수중부 구조물의 손상 누적으로 인한 붕괴가 우려되는 상황이다. 잔교식 안벽의 붕괴를 방지하고 체계적으로 유지관리하기 위한 방안으로 FBG 센서를 이용한 적용 방법과 안전성 평가 방법을 연구하였다. 잔교식 안벽에 파일로 사용되는 원형 강관에 대한 FBG 센서의 적용 방안을 확인하기 위해 실내실험을 실시하고, 센서를 용접하여 부착하는 방법으로 적용해야 하는 것을 확인하였다. 잔교식 안벽에 대한 구조해석을 수행하여 FBG 센서를 부착하기 위한 최적의 부착위치를 확인하였다. 고정하중에 대한 응력을 구조해석을 하여 계산하고, FBG 센서를 통해 얻은 데이터를 이용하여 활하중에 대한 응력을 계산한 다음에 두 응력을 더해서 파일에 작용하고 있는 응력을 계산하였다. 계산한 응력을 허용응력과 비교하여 파일의 안전성 평가를 수행하였다. 본 연구는 잔교식 안벽의 안전성을 실시간으로 평가하는 방안을 찾기 위한 기초 연구로 수행되었다.

Many of the facility management information system are being operated by each government departments and Acts. Therefore, it is difficult to share and integrate data through the network because data standard codes are not established. In spite of these problems, the Special Act on the Safety Management and maintenance imposes duties on the main agent of national infra structure management and the maintenance results should be integrated in Infra Structure Information Management System(FMS). Thus we propose the structure classification standard codes for the FMS to integrate and analyze safety and management data.

Most of the domestic jetties of jacket structure were designed by SACS with design criteria based on “Design Standards for Harbour and Fishery Port”. In fact, companies of structural maintenance and Inspection fail to conduct proper safety assessment of jetties of jacket structure using SACS due to a manpower shortage. But instead, they are using MIDAS to conduct safety assessment of these jetties as an alternative to using SACS. The purpose of this study is to provide the rational way for MIDAS user to assess jetties of jacket structure using SACS.

This study is a part of the research on the development of safety monitoring system and monitoring program of 3MW offshore wind support structure using fiber optic sensor. In this paper, we propose a maintenance system for offshore wind support structure using fiber optic sensor based on the analysis of current monitoring status and related standards of domestic and overseas offshore wind support jacket structures.

This study is a part of the research on the development of safety monitoring system and monitoring program of 3MW offshore wind support structure using fiber optic sensor. In this paper, we propose a maintenance system for offshore wind support structure using fiber optic sensor based on the analysis of current monitoring status and related standards of domestic and overseas offshore wind support jacket structures.

Recently, buildings tend to be large size, complex shape and functional. As the size of buildings is becoming massive, the need for structural health monitoring(SHM) technique is ever-increasing. Various SHM techniques have been studied for buildings which have different dynamic characteristics and are influenced by various external loads. Generally, the visual inspection and non-destructive test for an accessible point of structures are performed by experts. But nowadays, the system is required which is online measurement and detect risk elements automatically without blind spots on structures. In this study, in order to consider the response of non-linear structures, proposed a signal feature extraction and the adaptive threshold setting algorithm utilized to determine the abnormal behavior by using statistical methods such as control chart, root mean square deviation, generalized extremely distribution. And the performance of that was validated by using the acceleration response of structures during earthquakes measuring system of forced vibration tests and actual operation.