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http://dx.doi.org/10.11112/jksmi.2022.26.4.30

Application of Damage Index for Limit State Evaluation of a Steel Pipe Tee  

Kim, Sung-Wan (부산대학교 지진방재연구센터)
Yun, Da-Woon (부산대학교 지진방재연구센터)
Jeon, Bub-Gyu (부산대학교 지진방재연구센터)
Kim, Seong-Do (경성대학교 토목공학과)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.26, no.4, 2022 , pp. 30-39 More about this Journal
Abstract
Maintaining structural integrity of major apparatuses in a nuclear power plant, including piping system, is recognized as a critical safety issue. The integrity of piping system is also a critical matter related to the safety of a nuclear power plant. The actual failure mode of a piping system due to a seismic load is the leakage due to a fatigue crack, and the structural damage mechanism is the low-cycle fatigue due to large relative displacement that may cause plastic deformation. In this study, in-plane cyclic loading tests were conducted under various constant amplitudes using specimens composed of steel straight pipes and a steel pipe tee in the piping system of a nuclear power plant. The loading amplitude was increased to consider the relative displacement generated in the piping system under seismic loads, and the test was conducted until leakage, which is the limit state of the steel pipe tee, occurred due to fatigue cracks. The limit state of the steel pipe tee was expressed using a damage model based on the damage index that used the force-displacement relationship. As a result, it was confirmed that the limit state of the steel pipe tee can be quantitatively expressed using the damage index.
Keywords
Damage index; Damage model; Low-cycle fatigue; Steel pipe tee;
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