• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Effective arrangement of transverse strucrtural members of car carriers in preventing excessive racking deformation

Research Project

Project/Area Number 62550319
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 船舶構造・建造
Research InstitutionYokohama National University

Principal Investigator

SUMI Yoichi  Associate Professor, Faculty of Engineering, Yokohama National University, 工学部, 助教授 (80107367)

Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1988: ¥900,000 (Direct Cost: ¥900,000)
KeywordsKeywords thin walled deam / racking / car carrier / roll on / roll off ship / 構造解析 / 船体はり / ラッキング変形 / 構造配置
Research Abstract

Wide openings have been arranged in the transverse bulkheads of roll on/roll off ships in order to keep good behicles access on decks, which is further pursued in recent design by eliminating the transverse bulkheads in the upper part of the freeboard deck of a hull girder. Since its transverse sections are very weakly stiffened, they often exhibit significant shearing deformation so-called racking due to asymmetric loads with respect to the center line of the hull girder.
We first consider the effects of transverse partial bulkheads and strong web frames, whose relative rigidities to the main hull girder are defined in a non-dimensional form. Using these relative rigidities, we propose a simple formula to predict the racking deformation at the sections where the bulkheads or strong web frames are installed. The predicted values are found to be in good agreement with the numerical calculations.
Considerations are then made for the effects of the flexural rigidities of the transverse frames and the thickness of the shell platings, respectively. Then the combined effects of the bulkheads/strong web frames and transverse frames/shell platings are examined by numerical calculations. It is found that in some cases the combined effects may reduce the racking deformation 10-20 percents.
Finally case studies are made for two actual car carriers, which have essentially different structural configurations; the one has partial bulkheads and the other has strong web frames. The racking deformation estimated by the proposed simple method is in conformity with the results ob<ained by the complex three-dimensional hull girder analysis.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Y.Sumi,;Y.Yamamoto,;K.Suzuki,;S.Michiyama,;K.Kowata,;S.Hayashi: Naval Architecture and Ocean Engineering. 24. 159-168 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 角洋一・山下潤: 構造工学における数値解析法シンポジウム論文集. 12. 491-496 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Y. Sumi; Y. Yamamoti; K. Suzuki; S. Michiyama; K. Kowata; S. Hayashi: "Strength of a car carrier deformed by racking loads" Naval Architecture and Ocean Engineering. 24. 159-168 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Y. Sumi; J. Yamashita: "A consideration on effective structural arrangements od thin walled beams in preventing excessive racking deformation" Proceedings of Symposium on Computational Methods in Structural Engineering and Related Fields. 12. 491-496 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Y.Sumi;Y.Yamamoto;K.Suzuki;S.Michiyama;K.Kowata;S.Hayashi: Naval Architecture and Ocean Engineering. 24. 159-168 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] 角洋一、山下潤: 構造工学における数値解析法シンポシジウム論文集. 12. 491-496 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y. Sumi et al.: Naval Architecture and Ocean Engineering. 24. 159-168 (1987)

    • Related Report
      1987 Annual Research Report

URL: 

Published: 1988-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi