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1991 Fiscal Year Final Research Report Summary

Studies of Ship Structural Design Based on Reliability Engineering

Research Project

Project/Area Number 01302034
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 船舶構造・建造
Research InstitutionThe Univeristy of Tokyo

Principal Investigator

OHTSUBO Hideomi  The University of Tokyo, Faculty of Engineering, Professor, 工学部, 教授 (20011132)

Co-Investigator(Kenkyū-buntansha) NOMOTO Toshiharu  The University of Tokyo, Faculty of Engineering, Professor, 工学部, 教授 (80011170)
MUROTSU Yoshisada  The University of Osaka Prfescture, College of Engineering, Professor, 工学部, 教授 (50081386)
NOBUKAWA Hisashi  The University of Hiroshima, Faculty of Engineering Professor, 工学部, 教授 (60034344)
GODA Kunio  The University of Tsukuba, Institute of Engineering Mechanics, Professor, 構造工学系, 教授 (40134209)
NAGAMOTO Ryuichi  The University of Tokai, Faculty of Oceanography, Professor, 海洋学部, 教授
Project Period (FY) 1989 – 1991
Keywordsweight-optimal reliability-based design / damage factor / thin-walled beam / large deformation / longitudinal side frames / failure mode / importance factor of members / structural panel
Research Abstract

The Present method is compared with the existing optimal design method based only on safety factors. Numerical simulation reveals that the present method leads to lighter structure with the same reliability index. The fatigue strength design procedure has been formulated, and reliability engineering is introduced to the procedure. Then, fatigue damages of ship structures are analyzed by these, and criteria for a damage factor and safety index are proposed for these procedures. The finite element program is developed for largely deformed elastoplasticity, and the effects of the utilized constitutive equation on numerical solutions are discussed.
Also, the experiments of thin rectangular plate reinforced by L-shaped ribs under the action of bending are carried out to investigate large deformation behaviors, and compared with the finite element solutions.
The fatigue strength of the longitudinal side frames has been assessed under the estimation of wave loads applied to ship sides in irregu … More lar waves, and the effectiveness of this assessment is verified in comparison of analyses of actual ship side damage occurring at sea. The method has been developed for performing reliability analysis of ship structures based on ultimate strength, which automatically generates relevant failure modes and their equations by using a matrix method and a plastic node method.
Structural reliability assessments are carried out by using the method in which probabilistic collapse analysis and failure mode analysis are combined. Effects of some design parameter alteration on structural reliability are also discussed through parametric studies.
Reliability analysis of compressive collapse strength for ship structural panels are taken into consideration here. Probability of failure for deck plates and bottom plates are calculated. As for bottom plates which are subjected to not only compressive in-plane load but also lateral water pressure, it becomes clear that collapse buckling modes change.
Numerical method for evaluating a reliability of finite element analysis has been established. The method was applied in ship structure analysis. An expert system aiding optimal structure design was coded. Several techniques have been added to a knowledge base in order to consider reliability. Less

  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] 大坪 英臣,福村 勝: "信頼性評価に基づく構造物の最適設計に関する研究" 日本造船学会論文集. 170. 493-501 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大坪 英臣,北村 充: "有限要素法による船体構造解析の事後誤差評価に関する研究" 日本造船学会論文集. 170. 463-471 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 永元 隆一 ほか: "溶接構造要素のモデル疲労試験結果と疲労設計法の提案" 日本造船学会論文集. 170. 723-735 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 郷田 國夫,渡部 修: "防撓板付き帯板の大変形挙動" 日本造船学会論文集(発表予定).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 渡部 修 ほか: "Gren型構成式を用いた平面ブロックの弾塑性大変形シミュレ-ション" 構造工学における数値解析法シンポジウム. 15. 279-284 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshisada MUROTSU and Hiroo OKADA et.al.: "Reliability Assesment Techniques Appried to the Design at Marine Strutures" Proc.of OMAE'91. 229-235 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岡田 博雄,室津 義定 ほか: "破損条件式の複合線形化近似による骨組構造の最終強度解析とそれに基づく信頼性評価" 関西造船協会誌. 216. 225-230 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tetsuya YAO and P.I.NIOLOV: "Numerical Experiment on Bucling/Plastic Collapse Sehavior of Plates under Cyclic Loading" Proc.U.S.-JAPAN Seminar on Cyclic Buclibg of Steel Structures and Structural Elements under Dynamic Loading Condigtions. J-4-11. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tetsuya YAO and P.I.NIKOLOV: "Progressive Collapse Analysis of a Ship's Hull under Longitudinal Bending" 日本造船学会論文集. 170. 449-461 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大坪 英臣,久保田 晃弘: "相関問題" 培風館, 156 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hideomi OHTSUBO and Masaru HUKUMURA: "Reliability-Based Structural Optimization" Journal of the Society of Naval Architects of Japan. 170. 493-501 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hideomi OHTSUBO and Mitsuru KITAMURA: "A study on A-Posteriori Error Estimation of Finite Element Analysis for Ship Structure" Journal of the Society of Naval Architects of Japan. 170. 463-471 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ryuichi NAGAMOTO et al.: "Model Fatigue Test Result of Welded Structural Element and Proposal for Fatigue Design Procedure" Journal of the Society of Naval Architects of Japan. 170. 723-735 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kunio GODA and Osamu WATANABE: "Large Bending Deformation of a Band Plate with Stiffeners" Journal of the Society of Naval Architects of Japan.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osamu WATANABE et al.: "Large Deformation Analysis of Elastic Plastic Plane Block Using the Green-Rate Constitutive Equation" Proceedings of Symposium on Computational Methods in Structural Engineering and Related Fields. 15. 279-284 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshisada MUROTSU and Hiroo OKADA et al.: "Reliability Assessment Techniques Applied to the Design of Marine Structures" Proc. of OMAE'91. 229-235 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroo OKADA and Yoshisada MUROTSU et al.: "Ultimate Collapse Analysis and Reliability Assessment of Frame Structures Due to Multiple Surface Approximation for Failure Condition" Journal of the Society of Naval Architects of Japan. 216. 225-230 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tetsuya YAO and P. I. NIKOLOV: "Numerical Experiment on Buckling/Plastic Collapse Behavior of Plates under Cyclic Loading" Proc. U. S. -JAPAN Seminar on Cyclic Buckling of Steel Structures and Structural Elements under Dynamic Loading Conditions. J-4-11. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tetsuya YAO and P. I. NIKOLOV: "Progressive Collapse Analysis of a Ship's Hull under Longitudinal Bending" Journal of the Society of Naval Architects of Japan. 170.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hideomi OHTSUBO and Akihiro KUBOTA: Baihuukan. Coupled Systems, 156 (1991)

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

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Published: 1993-03-16  

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