Structural behavior of large-diameter cylindrical shell with stiffened opening

Sung Yong Kang, Deokhee Won, Jong Sup Park, Young Jong Kang, Seungjun Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In recent years, there has been a growing demand for renewable energy that is free of power generation by products to address the global climate and resource limitation crises. Wind power generation is maximizing efficiency through constant research and development, and as the use of large capacity turbines increases, the scale of supporting structure also increases. The structural maintenance of hollow towers, the supporting structure of wind turbines, requires the installation of an opening through which workers can access the tower to check corrosion, cracks, and damage to the tower body. However, these access points can affect the buckling strength of the tower structures due to section loss. In this study, the effects of the opening on the structural stability and ultimate strength of a large diameter cylindrical shell, which could be used as a wind turbine supporting tower structure, were studied through elastic buckling and nonlinear analyses. Based on the analytical results, the effects of the thickness of a collar stiffener around the opening on the structure’s ultimate strength were investigated. The results were compared to the design criteria, and through regression analysis, an effective equation to determine the collar stiffener’s thickness for large diameter cylindrical shells was proposed based on an opening that satisfied the design strength criteria.

Original languageEnglish
Article number1413
Issue number9
Publication statusPublished - 2021 Sept

Bibliographical note

Funding Information:
Funding: This research was funded by the Pohang Iron and Steel Co., Ltd. (POSCO). This research was also funded by the National Research Foundation of Korea (NRF).

Funding Information:
Acknowledgments: This research was conducted by the research project POSCO (Code 2020Z032). This work was also supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. NRF-2021R1A5A1032433).

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.


  • Collar stiffener
  • Geometric and material nonlinear analysis
  • Large diameter cylindrical shell
  • Linear buckling analysis
  • Maintenance opening
  • Megastructure
  • Optimal design
  • Wind turbine tower

ASJC Scopus subject areas

  • General Materials Science
  • Metals and Alloys


Dive into the research topics of 'Structural behavior of large-diameter cylindrical shell with stiffened opening'. Together they form a unique fingerprint.

Cite this