| Project/Area Number |
16206085
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Hiroshima University |
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Principal Investigator |
FUJIKUBO Masahiko Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (30156848)
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| Co-Investigator(Kenkyū-buntansha) |
KITAMURA Mitsuru Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (40195293)
OKAZAWA Shigenobu Graduate School of Engineering, Assistant Professor, 大学院工学研究科, 助教授 (10312620)
YANAGIHARA Daisuke Okayama Prefectural University, Faculty ofInfosmatin Engincering, Assistans, 情報工学部, 助手 (10294539)
YAMAMOTO Motomichi Graduate School Of Enginebringi, Assisfant Professor, 大学院工学研究科, 助手 (30274111)
MASAOKA Koji Osaka Prefectural University, Graduatc School of Engineering, Professor, 大学院工学研究科, 教授 (10244659)
安川 宏紀 広島大学, 大学院工学研究科, 教授 (40363022)
原田 実 (財)日本海事協会, 技術研究所, 研究員
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥22,490,000 (Direct Cost: ¥17,300,000、Indirect Cost: ¥5,190,000)
Fiscal Year 2006: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2005: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2004: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
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| Keywords | Ship Structure / Buckling Strength / Ultimate Strength / Idealized Structural Unit Method / Finite Element Method / Dynamic Explicit Method / Progressive Collapse Behavior / Initial Welding Imperfection / 縦曲げ最終強度 / 並列処理 / 座屈・塑性崩壊挙動 / 溶接残留応力 / 水圧荷重 |
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| Research Abstract |
An efficient method of progressive collapse analysis of ship structural members and systems was pursued in this study from two different aspects, one is the extension of Idealized Structural Unit Method (ISUM) and the other is the application of dynamic explicit method to quasi-static Finite Element Analysis (FEA). In ISUM, the structure is discretized into possible largest elements and the nonlinear behavior of such elements due to yielding and large deflection is idealized by appropriate shape functions and yielding criteria. The degree of freedom to solve for is therefore significantly reduced compared to FEA, resulting inthe reduction of computational efforts and time. The major achievements in this study can be summarized as follows:
(1) ISUM rectangular plate element was extended so that the lateral pressure can be considered as well as the thrust loads. It was also made possible to consider the effect of welding residual stresses both in plate and in stiffener. The progressive co
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llapse analysis of a ship cross section under pure bending was performed, and a good accuracy and an efficiency of ISUM were demonstrated. CPU time required for ISUM was about 1/70 of that for FEA.
(2) ISUM girder element for the progressive collapse analysis of double hull structure was developed. The effect of cutouts in the floor or girder can be considered by appropriately selecting integration points for the calculation of stiffness matrices. The progressive collapse analysis of a double bottom structure subjected to uniform lateral pressure showed the efficient and accurate applicability of the proposed ISUM model. CPU time required for ISUM was about 1/70-1/100 of that for FEA.
(3) The loading condition necessary for the quasi-static FEA using dynamic explicit approach was discussed. It was shown that the condition is given as a function of natural period corresponding to the natural vibration mode resembling the buckling mode.
(4) Cyclic bending test of a box-girder specimen was performed to investigate the cyclic collapse behavior including the initiation of a low cycle fatigue cracking after panel buckling. A comparison between test and ISUM analysis exhibited the satisfactory accuracy of ISUM analysis. Less
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