A new method to estimate ultimate strength of stiffened panels under longitudinal thrust based on analytical formulas

Murat Ozdemir*, Ahmet Ergin, Daisuke Yanagihara, Satoyuki Tanaka, Tetsuya Yao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

In this paper, a new approximate method based on analytical formulas is proposed to estimate the ultimate strength of stiffened panels by investigating collapse mechanisms of the stiffened panels. In this respect, firstly, a series of detailed elastoplastic large deflection Finite Element Analysis (FEA) is performed to investigate the collapse behavior and the ultimate strength of the stiffened panels. In the analysis, the initial deflections are considered in the form of thin-horse mode plus overall buckling mode for the plates, and flexural buckling mode plus tripping mode for the stiffeners. On the basis of the observed FEA results, an efficient method is proposed to estimate the ultimate strength of stiffened panels based on Elastic Large Deflection Analysis (ELDA) with the initial yielding concept. In the ELDA, the deflection modes are defined as the sum of overall buckling mode plus local plate buckling mode. The welding residual stresses are not taken into account in this study. The ultimate strength is predicted by examining yielding at several critical points. The calculated results by the proposed method and the nonlinear FEA are compared, and a very good agreement is obtained for all collapse scenarios investigated.

Original languageEnglish
Pages (from-to)510-535
Number of pages26
JournalMarine Structures
Volume59
DOIs
Publication statusPublished - May 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd

Funding

The first author was supported by The Scientific and Technological Research Council of Turkey (TUBITAK) under 2214-A International Doctoral Research Fellowship Program ( 1059B141500898 ), and it is gratefully acknowledged. Financial support of the Japan Society of Naval Architects and Ocean Engineers (JASNAOE) to the international collaborative research for young researchers is also gratefully acknowledged. This research was partially supported by the JSPS Grants-in-Aid for Scientific Research (A) ( 15H02328 ) and (C) ( 15K06632 ).

FundersFunder number
TUBITAK1059B141500898
Japan Society of Naval Architects and Ocean Engineers
Japan Society for the Promotion of Science15K06632, 15H02328
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

    Keywords

    • Nonlinear FEA
    • Simple method
    • Stiffened panels
    • Ultimate strength

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