권상 작업 중 슬링 파손으로 인한 블록 지상 낙하 충격에 대한 준정적 해석Quasi-Static Analysis of Block Impact Against the Ground Due to Sling Failure During Block Lifting
- Other Titles
- Quasi-Static Analysis of Block Impact Against the Ground Due to Sling Failure During Block Lifting
- 김선엽; 이탁기; 윤정호
- Issue Date
- 블록권상; 권상고리; 슬링 파손; 블록 손상; 후크 하중; 구조 건전성; Block lifting; Lifting lug; Sling failure; Block damage; Hook load; Structural integrity
- 대한조선학회 논문집, v.58, no.2, pp.84 - 89
- Journal Title
- 대한조선학회 논문집
- Start Page
- End Page
- Recently, shipyards are making many efforts to reduce the number of the mounted blocks by increasing the block size. This is to improve productivity and reduce related costs by minimizing block movement and shortening the building period. However, as the blocks become larger, the weight increases considerably. If the target block has a damage due to an unexpected accident during block lifting, it may seriously cause a problem of the reusability of the block. In this study, a large-sized block of the offshore structure weighing 480 tons was lifting with a total of seven sling belts, and one sling belt was broken while it was moving, resulting in a situation in which a part of the edge of the block collided with the ground. The aim of this paper is to verify the structural integrity of the block that directly collides with the ground in the form of free fall due to the sling breakage.
Considering that the hook loads acting on several sling belts holding the block are redistributed when a sling belt is broken, the hook loads were recalculated at the angle just before the sling breakage. These loads were used to check the safety of the sling belts. In addition, FE analysis was performed by calculating the amount of impact from the free fall condition, obtaining the impact area by using Hertz's contact theory, and then applying the impact load to the area.
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- 해양과학대학 > 조선해양공학과 > Journal Articles
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