용접부 후처리로 인한 피로 성능개선이 원통형 스틸 타워의 설계에 미치는 영향
Effect of fatigue resistance improvement due to welding post-treatment on tubular steel tower design
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초록
The recent trend in the fatigue design of tubular steel towers is moving away from conventional standards as each manufacturer develops its own design standards through experimental validation to enhance product competitiveness. Therefore, this study researches the effects of post-welding treatment on improving fatigue resistanfce to develop advanced design standards for fatigue. The research approach involves two main steps. First, an efficient welding post-treatment method for tubular steel towers is investigated, the effect of improving fatigue resistance is verified through experimental work, and an “advanced S-N curve” is defined. Second, the impact of fatigue resistance improvement on the overall design is examined for commercialized tubular steel towers. In a 10 MW offshore wind turbine, the weight of the tubular steel tower is reduced by 8.8% with the "advanced S-N curve," and the dominant ratio of the fatigue limit state is also significantly reduced. Thus, fatigue design with post-treatment such as blasting has a positive effect on enhancing product competitiveness.
Abstract
The recent trend in the fatigue design of tubular steel towers is moving away from conventional standards as each manufacturer develops its own design standards through experimental validation to enhance product competitiveness. Therefore, this study researches the effects of post-welding treatment on improving fatigue resistanfce to develop advanced design standards for fatigue. The research approach involves two main steps. First, an efficient welding post-treatment method for tubular steel towers is investigated, the effect of improving fatigue resistance is verified through experimental work, and an “advanced S-N curve” is defined. Second, the impact of fatigue resistance improvement on the overall design is examined for commercialized tubular steel towers. In a 10 MW offshore wind turbine, the weight of the tubular steel tower is reduced by 8.8% with the "advanced S-N curve," and the dominant ratio of the fatigue limit state is also significantly reduced. Thus, fatigue design with post-treatment such as blasting has a positive effect on enhancing product competitiveness.
참고문헌 (11)
- International Electrotechnical Commission, "IEC 61400-6:2020 Wind energy generation systems – Part 6: Tower and foundation design requirements", ~ (2020)
- Commission of the European Community, "EN1993-1-9 Eurocode 3: Design of steel structures – Part 1-9: Fatigue", ~ (2005)
- Det Norske Veritas, "DNV-RP-C203 Fatigue design of offshore steel structures", ~ (2019)
- International Institute of Welding, "Recommendations for fatigue design of welded joints and components : IIW document IIW-2259-15", ~ (2016)
- Rasmus Eichstädt, "Cost effective tower optimization - Certification of experimental S", N curves and slip-joint connection testing, 2024, ~
- Jonas Hensel, "Fatigue Strength Enhancement of Butt Welds by Means of Shot Peening and Clean Blasting", MDPI Metal, 9(7), pp.9~ (2019)
- Kim In Tae, "Improving Fatigue Strength of Weld Joints by Blast Cleaning used in Painting Steel Bridge", Journal of Korean Society of Steel Construction, 23(2), pp.137~146 (2011)
- International Standard, "ISO 12944-4 Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 4:Types of surface and surface preparation", ~ (2017)
- European Standard, "EN 10025-2 Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural steels", ~ (2019)
- International Standard, "Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections", ~ (2014)
- ASTM International, "ASTM E739-10 Standard Practice for Statistical Analysis of Linear or Linearized Stress-Life (S-N) and Strain-Life (ε-N) Fatigue Data", ~ (2015)