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Title |
Properties on the Airborne Chlorides of Offshore Bridges on the Western/Southern Coast in South Korea
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Authors |
정자혜(Jahe Jung) ; 민지영(Jiyoung Min) ; 이빛나(Binna Lee) ; 이종석(Jong-Suk Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.2.59 |
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Keywords |
비래염분; 해상교량; 교량높이; 지형특성; 비래염분 감소율 Airborne chlorides; Offshore bridge; Bridge height; Topographic characteristics; Decreasing rate of airborne chlorides |
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Abstract |
In this study, the monthly airborne chlorides flying into the offshore bridges were investigated depending on the sea level. The target structures were 9 bridges located on the western and southern coast of South Korea. The airborne chlorides were measured at different sea levels on each bridge every month during 1 year. The results showed that the strongest seasonal wind from the northwest in winter expecially have led increase of the airborne chlorides, and its effect was more significant in the western coast than the southern coast. It was also found that the airborne chlorides declined with the increase of sea level. Three types of curves were suggested for analyzing the decrease trend with the sea level, based on the airborne chlorides at the lowest measurement height of main tower. The trend was varied depending on the sea area, and even in the same sea area, the local topographic condition affected the airborne chlorides. It means that the location and local topography should be considered simultaneously for durability management in the framework of the chloride source, and then the influence of the chloride source should be classified, e.g. safe and dangerous. From these results, it is expected that it could be used as baseline data for the evaluation of the deterioration environment in the Detailed guidelines for safety and maintenance of facilities [Performance evaluation]_Bridge.
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