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2000 Fiscal Year Final Research Report Summary

Basic research on dynamic safety of large offshore structure

Research Project

Project/Area Number 10650467
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 構造工学・地震工学
Research InstitutionKagoshima University

Principal Investigator

KAWANO Kenji  Kagoshima University, Faculty of Engineering Department of Ocean Civil Engineering, Professor, 工学部, 教授 (10026297)

Co-Investigator(Kenkyū-buntansha) VENKATARAMANA Katta  Kagoshima University, Faculty of Engineering Department of Ocean Civil Engineering, Associate Professor, 工学部, 助教授 (30244263)
Project Period (FY) 1998 – 2000
Keywordslarge offshore structure / wave force and seismic force / dynamic safety / current force / reliability / power spectrum / dynamic response analysis
Research Abstract

A fundamental examination concerning dynamic safety of large offshore structure with buoyancy members was done in this research. Advancing an effective, positive use development of an oceanic space in our country becomes a very important problem. The circulating water tank experiment and the simulation analysis by the computer are done in this research.
The main result of obtaining for this research is summarized as follows.
1) Vortex induced vibration in each column is influenced by the interval of column member. As for the response by vortex induced vibration, the increasing tendency was seen at the case of single column when the interval of column narrowed. Moreover, it has been understood to cause torsion vibration as the entire structure by the difference of frequency where the vortex induced vibration of column in the back and forth is generated.
2) If the responses of the structure subjected to separately wave force and seismic force were compared, a big difference was shown in ben … More ding moment stress because the position where these external force acted was different. However, it has been understood to show-a similar response in the structural model which is united with connected material when the structure is enlarged.
3) The comparison on the design level response is done by using the reliability index for the wave force and the seismic force. In wave force, mean wave height, mean wave period, and duration are the main parameters. Moreover, the main parameter of seismic force is dominant frequency of the acceleration and surface layer. It has been understood that it is useful to be able to do the response evaluation to external force with a quite different dynamic characteristic by using the reliability index, and to evaluate the influence of each external force.
4) The maximum response of offshore structure subjected to wave force depends greatly when the restoring force characteristic of the structure becomes linear and nonlinear. Especially, the maximum response to wave force with long duration understands the influence of a nonlinear characteristic is large. Therefore, it is important to clarify the influence in the evaluation of the design level response. Less

  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] 河野健二,Venkataramana: "Dynamic response of a large offshore structures due to seismic"Proc.of the temth international offshore and polar eng.conference. Vol.4. 213-219 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 谷口朋代,河野健二: "波-潮流-構造物の相互作用を考慮した有脚式海洋構造物の不規則応答解析"土木学会論文集. No.661. 163-178 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 河野健二: "大型海洋構造物の動的応答に関する基礎的研究"構造工学論文集. Vol.46A. 523-527 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 河野健二,Venkataramana: "Nonlinear dynamic response of a large offshore structure due to wave forces"Applientions of stat and Probability. 781-787 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 河野健二,Venkataramana: "Seismic response effects on large offshore platform"Proc.of the ninth international offshore and polar Eng.Conference. Vol.4. 528-535 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 河野健二: "大型海洋構造物の動的応答に及ぼす非線形特性の影響"構造工学論文集. Vol.45A. 693-700 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawano, K.Venkataramana and T.Hashimoto: "Dynamic response evaluation of offshore platform with huge deck loads"Proc.of the eight international offshore and polar engineering conference. Vol.I. 317-324 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Venkataramana, K.Kawano and S.Yoshihara: "Time-Domain dynamic analysis of offshore structures under combined wave and earthquake loadings"Proc.of the eight international offshore and polar engineering conference. Vol.IV. 404-411 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano and K.Venkataramana: "Wave and earthquake response of large offshore platforms"Proc.of the second international conference on hydroelasticity in marine technology, Fukuoka. 365-374 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano and K.Venkataramana: "Nonlinear dynamic response of a large offshore platforms"Proc.of the eight KKNN seminar on Civil engineering. 85-90 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano and K.Venkataramana: "Approximate evaluation on dynamic response of offshore structure"Structural Safety and Reliability, Shiraishi, Shinozuka and Wen (eds). 1987-1993 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano, K.Venkataramana and T.Taniguchi: "Earthquake response and reliability analysis of offshore structure"Structural Safety and Reliability. 2029-2036 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano and K.Venkataramana: "Dynamic response and reliability analysis of large offshore structures"Computer methods in applied mechanics and engineering. Vol.168. 255-272 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano, K.Venkataramana and T.Hashimoto: "Seismic response effects on large offshore platform"Proc. of the ninth international offshore and polar engineering conference. Vol.IV. 528-535 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano, K.Venkataramana and T.Hashimoto: "Nonlinear response evaluations on large offshore structure due to wave force"Proc.of APCOM'99 Fourth Asia-Pacific conference on Computational Mechanics. 715-720 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano and K.Venkataramana: "Nonlinear dynamic response of a large offshore structure due to wave forces"Applications of Statistics and Probability, Melchers & Stewart (eds). 781-787 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano, K.Venkataramana and T.Hashimoto: "Dynamic response of a large offshore structures due to seismic loads"Proc.of the tenth international offshore and polar engineering conference. Vol.IV. 213-219 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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