풍력타워용 L형 플랜지 연결부의 구조성능 실험평가
An Experimental Evaluation of Structural Performance of L-Type Flange Joint for Wind Tower
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
An experimental study was conducted to evaluate the structural behavior of L-type flange joints. For this, one L-type flange joint test specimen for a 5 MW wind tower was designed and manufactured, and the structural behavior of each structural element of the joint was observed under increasing external tensile load (Z). The results of the analysis showed that the test specimen has a safety factor of 40 % compared to the design requirements of IEC 61400-6. In addition, strain gauge recordings showed that the tower shell and bolt comprising the test specimen had already reached the yield state before the final failure mode of the bolt and nut. Also observed in this study was that the experimental results of this specimen were in better agreement with Petersen's model in terms of overall behavior than any of the prediction models reviewed in this study. It is noted that additional experimental study is necessary to observe failure patterns in the threads of the bolt and nut.
Abstract
An experimental study was conducted to evaluate the structural behavior of L-type flange joints. For this, one L-type flange joint test specimen for a 5 MW wind tower was designed and manufactured, and the structural behavior of each structural element of the joint was observed under increasing external tensile load (Z). The results of the analysis showed that the test specimen has a safety factor of 40 % compared to the design requirements of IEC 61400-6. In addition, strain gauge recordings showed that the tower shell and bolt comprising the test specimen had already reached the yield state before the final failure mode of the bolt and nut. Also observed in this study was that the experimental results of this specimen were in better agreement with Petersen's model in terms of overall behavior than any of the prediction models reviewed in this study. It is noted that additional experimental study is necessary to observe failure patterns in the threads of the bolt and nut.
참고문헌 (11)
- Madsen, C. A., "Analytical and numerical investigation of bolted steel ring flange connection for offshore wind monopile foundations", IOP Conference Series: Materials Science and Engineering, 276(1), pp.012034~ (2017)
- Weijtjens, W., "Bolted ring flanges in offshore-wind support structures-in-situ validation of load-transfer behaviour", Journal of Constructional Steel Research, 176, pp.106361~ (2021)
- Chou, J. S., "Failure analysis and risk management of a collapsed large wind turbine tower", Engineering Failure Analysis, 18(1), pp.295~313 (2011)
- Cabrera-González, J. A., "A closed-form expression derived from virtual testing for structural optimization of L-flange bolted connections", Engineering Failure Analysis, 164, pp.108706~ (2024)
- Seidel, M., "Zur Bemessung geschraubter Ringflanschverbindungen von Windenergieanlagen" (2001), Leibniz Universität Hannover
- Seidel, M., "Influence of flange dimensions and geometrical imperfections on stress concentrations at welded flange necks", Stahlbau, 89(11), pp.932~943 (2020)
- Jung, D. J., "Study on Behavior Characteristics of L-Type Flange Bolt Connection for Supporting Structures of Wind Turbines", Journal of the Computational Structural Engineering Institute of Korea, 34(5), pp.279~286 (2021)
- Tran, T. T., "Understanding the behavior of L-type flange joint in wind turbine towers : Proposed mechanisms", Engineering Failure Analysis, 142, pp.106750~ (2022)
- International Electrotechnical Commission, "IEC 61400-6 Wind energy grneration systems – Part 6: Tower and foundation design requirements", ~ (2020)
- Tran, T. T., "Structural behavior of L-type flange joint with various flange flatness conditions", Energies, 16(15), pp.5703~ (2023)
- Jung, D. J., "Tensile Experiment and FE Analysis of L-type Flange Bolt Connection in Wind Turbine Support Structures", Journal of Wind Energy, 15(2), pp.37~44 (2024)