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Developmental Study on Structural Reliability Assessment Systems of Marine Structures

Research Project

Project/Area Number 01850095
Research Category

Grant-in-Aid for Developmental Scientific Research (B).

Allocation TypeSingle-year Grants
Research Field 船舶構造・建造
Research InstitutionUniversity of Osaka Prefecture

Principal Investigator

OKADA Hiroo  Univ. of Osaka Pref., Col. of Eng., Prof., 工学部, 教授 (90081398)

Co-Investigator(Kenkyū-buntansha) KITAURA Kenichi  Univ. of Osaka, Research Associate, 工学部, 助手 (00081399)
KISHI Mitsuo  Univ. of Osaka, Lecturer, 工学部, 講師 (00145814)
IKEDA Yoshiho  Univ. of Osaka, Assoc. Prof., 工学部, 助教授 (10117989)
OKAMURA Yoichiro  Univ. of Osaka, Assoc. Prof., 工学部, 助教授 (80081397)
MUROTSU Yoshisada  Univ. of Osaka Pref., Col. of Eng., Prof., 工学部, 教授 (50081386)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1990: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1989: ¥4,400,000 (Direct Cost: ¥4,400,000)
KeywordsMarine frame structure / Ultimate strength / Dynamical effect / Structural reliability / Dominant failure mode / Failure probability / Importance factor / Structural synthesis / 立体骨組モデル / 経年変化
Research Abstract

1. At first, applicabilities of the program package developed for reliability assessment of marine structures are investigated through numerical examples for two typical semi-submersibles, which are modeled as spatial frames and subjected to quasi-static extreme loads based on ultimate strength analysis. Results obtained in this study are summarized as follows :
(1) The underlying theory and the system's overview are provided. (2) The applicability of the system is demonstrated through the numerical examples for structures under beam and oblique seas (3) Effects of some design alterations on system reliability are also discussed by introducing importance factors as reliability measures under a damaged condition.
2. Next, methods are presented for the probabilistic analysis on the ultimate strength and the natural frequencies of composite and slender offshore structures for deep water, which are treated as a simple tower model by replacing its tower frameworks and platform with the beam-columns with equivalent stiffness and strength, respectively. A method is also presented for reliability assessment of aged marine structures considering increase of extreme wave loads due to marine growth and corrosion, and deterioration of rigidity and resistance due to corrosion. Further, the effect of uncertainty on the natural frequencies is discussed by using a probabilistic sensitivity analysis method. Finally, the applicability of the proposed methods is demonstrated through the numerical example for a 450m guyed tower.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report

Research Products

(20 results)

All Other

All Publications (20 results)

  • [Publications] Yoshisada MUROTSU,Hiroo OKADA: "System Reliability of SemiーSubmersible Platforms" Proceedings,4th International Conference on Structural Safety and Reliability (ICOSSAR'89). 879-886 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 岡田 博雄,ほか2名: "長大海洋骨組構造物の強度と固有振動特性に関する研究" 関西造船協会誌. 213. 153-159 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hiroo OKADA,Yoshisada MUROTSU: "A Study on the Probabilistic Analysis of the QuasiーStatic Strength and the Natural Freguencies of Slender Offshore Structures" Proceedings,1st Pacific/Asia Offshore Mechanics Symposium(PACOMS'90). Vol.3. 223-228 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hiroo OKADA,Yoshisada MUROTSU: "A Method for Reliability Assesment of Aged Jacket Structures Based on Ultimate Strength Analysis" do.Vol.3. 229-234 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 岡田 博雄,ほか7名: "セミサブOSモデルへの信頼性設計の適用(その2ー全体崩壊)" 第10回海洋工学シンポジウム(日本造船学会). 191-198 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Murotsu, Y. and Okada, H.: "System Reliability of Semi-Submersible Platforms" Proc., ICCOSAR '89(ed. by Shinozuka, M. et al), IASSAR. 879-886 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Okada, H., et al.: "A Study on the Strength and the Natural Vibration of Slender Offshore Structures" Journal, Kansai Soc. of Naval Architects, Japan,. NO. 213. 153-159 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Okada, H. and Murotsu, Y.: "A Study on the Probabilistic Analysis of the Quasi-Static Strength and the Natural Frequencies of Slender Offshore Structures" Proc., PACOMS '90(ed. by Ueda, Y., et al.), ISOPE. Vol. 3. 223-228 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Okada, H. and Murotsu, Y.: "A Method for Reliability Assessment of Aged Jacket Structures Based on Ultimate Strength Analysis" Proc., PACCOMS '90(ed. by Ueda, Y. et al.), ISOPE. Vol. 3. 229-234 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Okada, S., Okada, H., et al.: "Reliability Analysis of a Semi-Submersible Offshore Structure (OS-MODEL) (2nd. Report - Overall Collapse)" Proc., 10th. Marine Technology Symposium, JSNAME. 191-198 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Yoshisada MUROTSU,Hiroo OKADA: "System Reliability of SemiーSubmersible Platforms" Proceedings,4th International Conference on Structural Safety and Reliability. 879-886 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] 岡田 博雄,他2名: "長大海洋骨組構造物の強度と固有振動特性に関する研究" 関西造船協会誌. 213号. (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Hiroo OKADA,Yoshisada MUROTSU: "A Study on the Probabilistic Analysis of the QuasiーStatic Strength and the Natural Frequencies of Slender Offshore Structures" Proceedings,1st Pacific/Asia Offshore Mechanics Symposium. Vol.3. 223-228 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Hiroo OKADA,Yoshisada MUROTSU: "A Method for Reliability Assessment of Aged Jacket Structures Based on Ultinate Strength Analysis" do,. Vol.3. 229-234 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 岡田 博雄,ほか7名: "セミサブOSモデルへの信頼性設計の適用(その2ー全体崩壊)" 第10回海洋工学シンポジウム(日本造船学会). 191-198 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yoshisada MUROTSU,Hiroo OKADA: "System Reliability of Semi-Submersible Platforms" Proc.of ICOSSAR'89. (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 岡田博雄,他2名: "長大海洋骨組構造物の強度と固有振動特性に関する研究" 関西造船協会誌. 213. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Hiroo OKADA,Yoshisada MUROTSU: "A Study on Probabilistic Analysis of the Quasi-Static Strength and the Natural Vibration of Slender off shore Structures" Proc.of PACOMS'90. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Hiroo OKADA,Yoshisada MUROTSU: "A Method for Reliability Assessment of Aged Jacket Structures Based on Ultimate Strength Analysis" Proc.of PACOMS'90. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 岡田博雄,上山圭司: "塑性節点法による板構造の限界状態基準式の生成" 第13回NCP研究会・機械の強度と形態研究懇話会シンポジウム論文集. 75-80 (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-03-31   Modified: 2016-04-21  

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