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하민균,권태윤,김련학,안진희 한국강구조학회 2024 韓國鋼構造學會 論文集 Vol.36 No.1
본 연구에서는 강교량 도장의 백아화와 상태평가 방법을 분석하기 위하여 공용 중 강교량 20개를 선정하여 색차, 백아화, 도장두께를 측정하였다. 색차계를 활용하여 색차를 측정하고, 테이프법과 표준사진을 활용하여 백아화 등급을 평가하였으며, 백아화 제거 전후의 도장두께를 측정하여 백아화 발생 수준에 따른 도장두께 감소량을 평가하였다. 색차 분석 결과, 도장계의 색상에 따라 상대적으로 색차가 발생하는 것을 확인할 수 있었으며, 흰색 도장계는 백아화가 발생하더라도 색차가 나타나지 않는 것을 알 수 있었다. 백아화 등급과 도장두께 평가 결과, 백아화는 외측에 위치한 강부재에 발생하였으며, 백아화가 발생함에 따라 도장두께가 감소하는 경향이나타났다. 또한, 도장두께는 백아화 수준이나 상대적인 편차에 따라 감소량이 상대적일 수 있음을 확인하였다. 추가적으로, 백아화 등급 평가 방법을 간소화하기 위한 방법으로 사진촬영 이미지만으로 백아화를 평가할 수 있는 Convolutional Neural Network (CNN)을머신러닝 기법으로 적용하여 분석하였다. In this study, to analyze the paint chalking and condition evaluation methods of the steel bridges, 20 public steel bridges were selected and the color difference, paint chalking, and coating thickness were measured. The color difference was measured using a colorimeter, and the grades of paint chalking were evaluated using the tape method and standard photos. The paint coating thickness before and after removing the paint chalking was measured to evaluate the reduction of the paint coating thickness depending on the paint chalking level. From a result of color difference analysis, it was confirmed that a relative color difference occurred depending on the color of the paint type, and it was found that white paint showed color difference even if paint chalking occurred. In addition, it was confirmed that the reduction in paint coating thickness may be relative depending on the level of paint chalking or relative deviation. Furthermore, as a method to simplify the evaluation process of paint chalking, a machine learning model that can evaluate its grade using only photographic images was analyzed by CNN(Convolutional Neural Network).
강재 수문의 부재 위치 및 설치 방향에 따른 상대 부식속도 평가
하민균,정영수,박승훈,안진희 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 논문집 Vol.23 No.7
The corrosion amounts of steel structures can be different from depending on the type of installation and height. Thus, their corrosion maintenance should be considered depending on installation conditions of local structural members. In this study, atmospheric exposure test was conducted to evaluate the corrosion amount and corrosion rate depending on the type of installation and height of a steel water gate using monitoring steel plates and corrosion environment measuring sensors. The mean corrosion depth was evaluated using weight loss method and the galvanic corrosion current was measured by corrosion environment measuring sensors. Local corrosion rate of local structural member in steel water gate was estimated using measured mean corrosion depths and galvanic corrosion currents. From this measurement results, corrosion damage in horizontal member of the cross beam was highly evaluated than those of other structural member as skin plate, etc. The relative difference in the corrosion rate of a local structural member could be highly affected by local corrosion environments of steel water gate members. Therefore, an appropriate maintenance method should be considered for local corrosion damages of local structural members determined by local corrosion environments of a steel water gate. 강재로 제작된 구조물의 부식량은 설치형태에 따라 상이하게 나타나므로 그에 따른 효율적인 관리가 필요하다. 본 연구에서는 강재 수문의 설치형태와 높이에 따른 부식량과 부식속도를 평가하기 위하여 설치형태와 높이에 따라 모니터링 시험체와 부식환경측정 센서를 설치하여 대기노출실험을 실시하였다. 노출기간에 따라 모니터링 시험체를 회수하여 중량감소법으로 평가된 평균부식두께와 부식환경측정 센서를 통하여 계측된 갈바닉 부식전류량과의 상관관계를 이용하여 강재 수문의 설치형태와 높이에 따른 향후 부식량을 예측하였다. 본 연구결과 수문의 가로보 수평부재는 상대적으로 가로보 스킨플레이트 부재 등의 부식손상량과 비교하면 매우 크게 발생하고 있으며, 수문 부재의 국부적 환경에 따라 부식속도가 크게 영향을 받을 수 있음을 확인할 수 있었다. 따라서 강재 수문의 국부적 부식환경 차이에 따른 부식손상 수준을 고려한 수문의 적절한 유지관리가 필요할 것으로 판단된다.
하민균,허창재,유훈,안진희,Min-Gyun Ha,Chang-Jae Heo,Hoon Yoo,Jin-Hee Ahn 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 논문집 Vol.27 No.4
In this study, to analyze the correlation of surface chloride and corrosion amount level according to the installation location of steel members exposed to the marine environment, the surface chloride and mean corrosion depth were evaluated by member units for box girder members of the offshore steel bridge and box specimens. The surface chloride was measured monthly using the Bresle method for one year. The corrosion amount was evaluated by converting the weight loss due to corrosion products generated in the monitoring steel plate into mean corrosion depth. As a measurement result of the surface chloride and corrosion amount, relative differences in surface chloride and mean corrosion depth were appeared depending on the shape or installation location of the steel members. Moreover, even if members of the same shape were installed in the same bridge, it was confirmed that the corrosion amount was increased locally and rapidly. The tendency of corrosion amount depending on the surface chloride was evaluated to analyze the correlation between surface chloride and corrosion amount, and the relation equations that can asseses the corrosion amount depending on the surface chloride were analyzed. From the results of the correlation between surface chloride and corrosion amount, it was found that the corrosion amount of the steel member affected by the surface chloride was varied up to about 1.15 times depending on the structural detail.
하민균,전석현,정영수,마호성,안진희 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.1
Corrosion environment monitoring was conducted on the structural members of a steel bridge truss in a marine environment. The corrosion depth measured on exposed monitoring steel plates and the galvanic corrosion current measured by Atmospheric Corrosion Monitoring sensors attached to structural members were used to evaluate the local corrosion environment of each type of structural member in the steel bridge truss. From the evaluation results, the corrosion environment of the horizontal structural member was found to be worse than those of the other members, indicating that the horizontal members should be the primary target for monitoring and maintenance eff orts.
강구조물 부식환경에 따른 젖음 시간과 평균부식두께의 상관관계평가
하민균,허창재,안진희 한국강구조학회 2022 韓國鋼構造學會 論文集 Vol.34 No.3
Durability reduction of steel structures is attributed to various corrosive environment factors accumulated on the steel surface. It is necessary to analyze the correlation between corrosive environment factors and mean corrosion depth to evaluate the level of corrosion deterioration for steel structures depending on the corrosive environment factors. In this study, a correlation between corrosive environment and mean corrosion depth was analyzed from outdoor exposure test results for various locations such as marine environment, inland area, etc., and steel structures. The relative occurrence tendency of time of wetness and corrosion damage for the locations and steel structures was evaluated from time of wetness calculated using corrosion current and mean corrosion depth. In addition, a regression analysis was conducted from analysis data for the time of wetness and the mean corrosion depth. From the regression analysis results, relative corrosion deterioration levels depending on the locations and steel structures were compared. 강구조물 내구성 저하의 주요 원인인 부식열화를 발생시키는 요인은 강재 표면에 누적되는 다양한 부식환경인자이며, 부식환경인자에 따른 강재의 부식열화 수준을 평가하기 위하여 부식환경인자와 부식손상량의 상관관계를 평가할 필요가 있다. 본 연구에서는 다양한 지역 및 구조물에 대한 1년 동안의 옥외노출실험 결과를 활용하여 부식환경과 부식손상량의 상관관계를 분석하였다. 상관관계 분석을 위하여 부식전류량 계측값을 통한 젖음 시간과 강재 표면의 평균부식두께를 활용하였으며, 지역 및 구조물별 젖음 시간과평균부식두께의 상대적인 발생 경향을 분석하였다. 또한, 젖음 시간과 평균부식두께에 관한 분석데이터를 활용하여 회귀분석을 진행하였으며, 회귀분석결과를 활용하여 옥외노출실험으로 발생한 부식열화 수준과 구조물별 국부적인 부식열화 수준을 비교하였다.
하민균 ( Ha Min Gyun ),전석현 ( Jeon Seok Hyeon ),이영빈 ( Lee Young Bin ),안진희 ( Ahn Jin Hee ),박승훈 ( Park Seung Hun ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
Steel water gate can be vulnerable to corrosion problem, since it is generally contacted with water or maintained with relatively high humidity condition. In this study, to evaluate the level of corrosion damage of water gate, corrosion exposure test was conducted using monitoring steel plate and monitoring sensor in actual steel water gate. From exposure test results, corrosion rate and corrosion environment were examined depending on the height or the structural type of water gate.