Development of effective calculaton procedure for hull girder ultimate strength under lateral loading and after damaged by collision

• Project/Area Number: 26289334
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Naval and maritime engineering
• Research Institution: Kyushu University
• Principal Investigator: Yoshikawa Takao 九州大学, 工学(系)研究科(研究院), 教授 (50380572)
• Co-Investigator(Kenkyū-buntansha): 前田 正広 九州大学, 工学(系)研究科(研究院), 助教 (70173713)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥14,040,000 (Direct Cost: ¥10,800,000、Indirect Cost: ¥3,240,000); Fiscal Year 2016: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2015: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2014: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
• Keywords: 最終強度 / 船体縦曲げ強度 / 横荷重影響 / FEM解析 / Smith法 / 換算細長比 / 形状初期不正 / 形状初期不整 / 衝突変形 / 横荷重 / 数値シミュレーション / 初期不整 / 最終高度 / 逐次計算法 / 横倒れ座屈

Outline of Final Research Achievements

Hull girder ultimate strength of two types of bulk carriers are calculated under the alternative loading condition which gives much effect of lateral loading. It was confirmed that the hull girder untimate strength reduces 25％ due to lateral loading when hogging condition in which the bottom parts are in compression. The accuracy of FE calculations for ultimate strength are confirmed by comparison to the experimental results for four points bending tesst of box girder models. Moreover, the effect of uncertainties such as the amplitude of geometrical initial imperfectiona and thicvkness reduction by corrosin on the hull girder ultimate strength are investigated utilizing the techniques of Monte Calro Simulations.

Research Products

• [Int'l Joint Research] University of Newcastle(英国)
• [Int'l Joint Research] Chalmers University of Technolog(Sweden)
• [Int'l Joint Research] Canadian DND(Canada)
• [Int'l Joint Research] Technical University of Lisbon, Portugal(Portugal)
• [Int'l Joint Research] University of Rostock(Germany)
• [Int'l Joint Research]
• [Journal Article] 健全時および損傷後の船体縦曲げ最終強度に関する研究 (2015)
  • Author(s): 藤公博、吉川孝男
  • Journal Title: 日本船舶海洋工学会論文集 Volume: 22 Pages: 137-150
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Takao Yoshikawa, A Bayatfar,, B. J. Kim, C.P. Chen, D. Wang, J.Boulares, J. M. Gordo, (2015)
  • Author(s): Ultimate Strength
  • Journal Title: Proceedeings of The 19th International Ship and Offshore Structures Congress Volume: １ Pages: 279-350
  • Int'l Joint Research
• [Journal Article] Fracture analysis considering the effect of stress tri-axiallity (2015)
  • Author(s): Takuya, Ishibashi, Masahiro Maeda, Takao Yoshikawa
  • Journal Title: Proceedings of the 28th Asian Technical Exchange and Advisory Meeting Volume: 28 Pages: 102-109
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] A Probability Study on Hull Girder Ultimate Strength of Bulk Carrier considering Structural Uncertaintie (2016)
  • Author(s): Ristianto Adiputra, Takao Yoshikawa
  • Organizer: TEAM2016, The 25th Asian Technical Exchange and Advisory Meeting on Marine Structures
  • Place of Presentation: 韓国,Moppo
  • Year and Date: 2016-10-10
  • Int'l Joint Research
• [Presentation] A Study on the Simplified Calculation Method for the Residual Ultimate Strength of Damaged Structures (2016)
  • Author(s): Kimihiro Toh, Shunsuke Maeda, and Takao Yoshikaw
  • Organizer: OMAE2011, 35th International Conference on Offshore Mechanics and Polar Engineering
  • Place of Presentation: 韓国,Busan
  • Year and Date: 2016-06-21
  • Int'l Joint Research
• [Presentation] Fracture Analysis considering the Effect of Stress Tri-axiality (2016)
  • Author(s): Takao Yoshikawa, Maeda Masahiro, Toh Kimihiro Takuya Ishibashi
  • Organizer: ICCGS2016,Collision and Grounding of Ships and Offshore Structures
  • Place of Presentation: 核国,Ulsan
  • Year and Date: 2016-06-16
  • Int'l Joint Research
• [Presentation] The averaged stress-strain curve of the stiffened panel under compression after damaged by lateral impact load (2015)
  • Author(s): Shunsuke Maeda, Kimihiro Toh, Masahiro Maeda, and Takao Yoshikawa
  • Organizer: Proceedings of the 29th Asian Technical Exchange and Advisory Meeting
  • Place of Presentation: ロシア、ウラジオストック
  • Year and Date: 2015-10-12
  • Int'l Joint Research
• [Presentation] A Study on the Simplified Calculation Method for Hull Girder Ultimate Strength of Damaged Hull Structures (2015)
  • Author(s): Kimihiro Toh, Shunsuke Maeda, and Takao Yoshikawa
  • Organizer: The 23th International Offshore and Polar Engineering Conference, vol.4, pp1144-1152,
  • Place of Presentation: USA,ハワイ
  • Year and Date: 2015-06-22
  • Int'l Joint Research
• [Presentation] 防撓材のねじれ変形を考慮した冒頭パネルの最終強度計算法 (2014)
  • Author(s): 藤公博、吉川孝男
  • Organizer: 日本船舶海洋工学会
  • Place of Presentation: 長崎市
  • Year and Date: 2014-11-20 – 2014-11-21
• [Presentation] Fracture analysis considering the effect of stress tri-axiallity (2014)
  • Author(s): Takuya, Ishibashi, Masahiro Maeda, Takao Yoshikawa
  • Organizer: the 28th Asian Technical Exchange and Advisory Meeting
  • Place of Presentation: イスタンブール
  • Year and Date: 2014-10-13 – 2014-10-16