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콘크리트포장 알칼리 골재반응에 의한 구조물 손상원인 및 대책
이명훈,민경무,손효상,김용길 한국구조물진단유지관리공학회 2014 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2014 No.10
This study suggested an improvement of expansion joint and asphalt pavement construction to prevent pavement and bridges damage due to alkali silica reaction. First, for the case study of alkali silica reaction, we conducted a field survey of expressway 15 Mokpo - Muan. As a result, those following damages were investigated such as abutment tensile cracks, pavement crazing and rising, joint contractions and localized damage etc. To prevent this, we applied those following improvements to Muan2 bridge and Samjeong bridge of expressway 15 and confirmed improvement effectiveness by monitoring. 1) Installing an expansion joint on a bridge near pavement slabs(3 points), 2) constructing asphalt pavement after removing concrete pavement(6m). In conclusion, through such improvements suggested above, we expect that we will be able to effectively prevent bridges damage due to Alkali Silica Reaction. Consequentially, it will also contribute improving the safety of vehicles in the expressway.
임근용,민경무,오종구,윤충섭 한국구조물진단유지관리학회 2013 한국구조물진단유지관리공학회지 Vol.17 No.4
1968년 국내에 고속도로가 개통된 이후 44년 동안 한국도로공사에서 관리하는 터널은 709개소, 539,046m로 친환경 고속도로 건설추세에 맞추어 관리할 터널은 지속적으로 증가가 예상된다. 이런 공용중 터널들은 설계기준에 맞게 시공하여도 지형조건, 기타 제반여건 등이 상이하여 집중호우시 터널내 용출수 과다로 포장균열, 들뜸 및 솟음현상이 발생하여 공용중인 차량의 안전에 위험요인으로 작용하고 있어 공용중인 터널내 배수시설의 효율적인 유지관리를 위해 다각적인 배수처리방안을 수립 하고자 한다.
하천 측량용 헥사콥터의 단일로터에 대한 제자리 비행 성능 연구
정원훈,김봉환,민경무,차엘리,박근우 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.8
In this study, an experimental device was fabricated to evaluate the hovering flight performance of a single rotor on a hexacopter used for river surveillance, and a thrust performance test was conducted. In addition, the 3D profile of the propeller was extracted by 3D scanning and CFD analysis was performed using ANSYS CFD 14.5 based on the extracted 3D model of the propeller. The aerodynamic characteristics were compared with the results of the performance tests and CFD analysis, and the vortex structure corresponding to each motor rotational speed in revolutions per minute (rpm) was identified. In the future, we plan to provide valuable data for multicopter propeller design and performance verification.