Reliability Assessment of Frame Structures Based on Ultimate Strength Analysis
| Project/Area Number |
63550325
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶構造・建造
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| Research Institution | The University of Osaka Prefecture |
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Principal Investigator |
OKADA Hiroo Univ. of Osaka Pref., Col. of Eng., Prof., 工学部, 教授 (90081398)
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| Co-Investigator(Kenkyū-buntansha) |
KITAURA Ken-ichi Univ. of Osaka Pref., Col. of Eng., Research Assoc., 工学部, 助手 (00081399)
KISHI Mitsuo Univ. of Osaka Pref., Col. of Eng., Lecturer, 工学部, 講師 (00145814)
OKAMURA Yoichiro Univ. of Osaka Pref., Col. of Eng., 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)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1989: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1988: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | ship main structure / spatial frame structure / ultimate strength / plastic node method / dominant collapse mode / failure probability / structural reliability / central safety factor / 主要崩壊モ-ド / 有限要素法 / 船体縦横骨組構造 / 複合荷重 / 塑性崩壊 / 信頼性評価 |
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| Research Abstract |
1. A system is developed for reliability assessment of spatial frame structures based on ultimate strength analysis. (1) Ultimate collapse is evaluated by using a linearized failure condition of the section under the combined effect of axial force, shearing forces, biaxial bending moment and torsional moment. (2) A plastic node method combined with a finite element method is used to generate the safety margins of ultimate collapse modes. (3) Stochastically dominant collapse modes are selected by applying the so-called branch-and-bound methods combined with heuristic operations.
2. The system is successfully applied to ship main structures, which are modelled as spatial frame structures and subjected to various notional loading conditions. Probabilistic properties of ultimate strength of ship main structures are investigated through the numerical examples for a large tanker (240,OOODWT) and comparison with previous results for plane frame models. (See reference 1.)
3. The system is also applied to typical plate structures having orthogonal stiffeners as a basic study on ultimate strength analysis of ship bottom platings, which are modelled as plane frames and subjected to combined in-plane compression and lateral pressure. Through numerical examples and comparison with previous researches, the applicability of the proposed methods is demonstrated. (See references 2 and 3.)
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Report
(3 results)
Research Products
(10 results)
