다중 적층형 금속 벨로우즈 신축관이음의 내진성능 시험 = Seismic Performance Test of Multi-ply Metal Bellow-Type Expansion Joints

다국어 초록 (Multilingual Abstract)

Pipelines are representative infrastructure facilities. Damage to pipelines caused by earthquakes is highly to cause serious damage for city. Therefore, pipeline need to be protected from earthquakes. But large relative displacements exceeding the allowable displacement of pipe can be caused by earthquakes. This seismic behaviors could causes damage to the joint of the pipe. The seismic performance of the pipe can be improved by applying a seismic separation joint to a location where excessive deformation of the pipe may occur. The multi-ply metal bellows has good durability against low-cycle fatigue loads such as earthquakes. Therefore multi-ply metal bellows could be used as seismic separation joint of pipes. In this study, Experimental study was performed for multi-ply metal bellows which is the one of seismic separation joint. Monotonic and cyclic loading tests were performed on two types of multi-ply metal bellows and limit state was estimated. The difference of leakage displacement in the monotoinc loading tests are less than 2%. However, the leakage displacement of the cyclic loading tests showed a difference of more than 12%. As a result, more layers of bellows could improve the performance for cyclic loading of multi-ply metal bellows.

국문 초록 (Abstract)

배관시스템은 대표적인 사회기반시설이다. 지진으로 인한 배관 손상은 심각한 피해를 초래할 수 있으므로 배관시스템은 지진으로부터 반드시 보호되어야 할 필요가 있다. 지진은 설계기준을 초과하는 상대변위를 동반할 수 있다. 이러한 지진의거동은 배관 이음부에 손상을 줄 수 있다. 배관시스템에서 과도한 변형이 발생할 수 있는 위치에 지진분리이음을 적용하면 내진성능을 향상시킬 수 있다. 적층형 금속 벨로우즈는 지진과 같은 저주기 피로 하중에 대한 내구성이 우수하다. 따라서 다중 적층형 금속 벨로우즈는 파이프의 면진 이음새로 사용할 수 있을 것으로 판단된다. 본 연구에서는 지진분리이음의 하나인 다중 적층형 금속 벨로우즈에 대한 실험적 연구를 수행하였다. 2종류의 다중 적층형 벨로우즈 신축관이음에 대하여 단조하중 및 반복하중재하시험을 수행하고 손상모드와 한계상태를 추정하였다. 그리고 단조재하시험과 반복재하시험의 결과를 비교 분석하였다.

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