Wind-resistant performance and failure modes for a semi-submersible offshore platform during jacking closure

Currently, the construction process of large offshore platforms worldwide involves building the topside and hull separately and then having them integrated. The jacking closure scheme by overlapped support tower bearing the topside is a new integration method, which has a great advantage over other traditional methods in vertical bearing capacity. But its weak bearing capacity to lateral forces like wind load limits the jacking height. Moreover, few engineering examples and academic researches also cause insufficient understanding of it. Therefore, this paper, based on the first deep-water semi-submersible platform with the 10,000-ton oil storage worldwide, i.e. “Deep Sea No. 1” energy station, aims to evaluate the wind-resistant performance during the jacking closure process. Firstly, the background and the jacking closure scheme of this project are introduced in detail. Secondly, the finite element models (FEMs) of the jacking system are established according to the overlapped characteristics of jacking towers and the corresponding failure criteria. Then, the wind-induced vibration response is simulated, and the static pushover is conducted to evaluate the ultimate bearing capacity and its influencing factors. The failure criteria are checked using ANSYS parameter design language. It is found that “the occurrence of tensile stress on the contact surface” is the first and main failure mode of the structure. Additionally, the results also reveal that the strand cables can not only improve the ultimate bearing capacity of the structure but also change its weak direction. However, the improvement is gradually weakened with the increase of jacking height. In contrast, the contribution of the bracing pipes to the structural bearing capacity is always significant. These findings can be used to develop a more reasonable closure plan.

• Record URL:
  https://doi.org/10.1016/j.oceaneng.2021.110102
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S0029801821014268
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00298018
• Supplemental Notes:
  • © 2021 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Liu, Hui-Juan
  • Li, Hong-Nan
  • Fu, Xing
• Publication Date: 2021-12-1

Language

• English

Media Info

• Media Type: Web
• Features: Appendices; Figures; References; Tables;
• Serial:
  • Ocean Engineering
  • Volume: 241
  • Issue Number: 0
  • Publisher: Pergamon
  • ISSN: 0029-8018
  • EISSN: 1873-5258
  • Serial URL: http://www.sciencedirect.com/science/journal/00298018

Subject/Index Terms

• TRT Terms: Failure; Jacketing (Strengthening); Offshore platforms; Semisubmersibles; Wind
• Subject Areas: Marine Transportation; Terminals and Facilities;

Filing Info

• Accession Number: 01788182
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 17 2021 2:25PM