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

Özdemir, Murat; Ergin, Ahmet; Yanagihara, Daisuke; Tanaka, Satoyuki; Yao, Takeshi

doi:10.1016/j.marstruc.2018.01.001

Cited by 27 publications

(8 citation statements)

References 28 publications

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“…This evaluation is conducted for different sub-domains. It was suggested by Ozdemir et al (2018) that the primary failure mode of stiffened panels under compression may change from local plate buckling to beam-column buckling at the threshold λ = 0.6. On the other hand, the compressive strength of plating may change substantially when β > 1.9.…”

Section: Evaluation Of Existing Empirical Methodsmentioning

confidence: 99%

An adaptable algorithm to predict the load-shortening curves of stiffened panels in compression

Shen

Kim

Benson

2021

Ships and Offshore Structures

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An adaptable algorithm is proposed in this study, which can predict the complete load-shortening curve of a stiffened panel subjected to uniaxial longitudinal compression. The algorithm provides an extension to existing empirical formulae initially derived for predicting the ultimate compressive strength of stiffened panels. Based on observations from a series of nonlinear finite element analyses, the compressive load-shortening behaviour of stiffened panels is idealised with a linear pre-collapse response, an arc-shaped nonlinear ultimate collapse region and an asymptotic post-collapse decay. The algorithm allows direct modification of the elastic stiffness, ultimate strain, ultimate strength and post-collapse characteristics of the load shortening curve. This enables the load shortening curve to incorporate characteristics specific to the type of stiffened panel under analysis. The capability of the algorithm is demonstrated through an application with the simplified progressive collapse method to calculate the ultimate ship hull strength of four merchant ships and one naval vessel.

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Section: Evaluation Of Existing Empirical Methodsmentioning

confidence: 99%

An adaptable algorithm to predict the load-shortening curves of stiffened panels in compression

Shen

Kim

Benson

2021

Ships and Offshore Structures

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“…This might represent a constraint on the deformation of the plate and on the web and flange of the stiffener, but the experience from other similar analyses [9,10] indicates that this has small impact on the results. Edge B2 is fixed in the 1-direction.…”

Section: Finite Element Model (Fem)mentioning

confidence: 99%

“…Ozdemir et al [10] proposed a new approximate method based on analytical formulas to estimate the ultimate strength of stiffened panels, where a series of detailed elastoplastic large deflection FEA was carried out. The initial deflections were accounted for in the form of thin-horse mode plus overall buckling mode for the plates, and flexural buckling mode plus tripping mode for the stiffeners.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Buckling Response of the Deck Panel in Axial Compression

Özgüç

2018

Polish Maritime Research

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In this work, buckling strength assessment of a deck of a double hull oil tanker is carried out using the non-linear finite element code ADVANCE ABAQUS. The comparisons are performed with the Det Norske Veritas (DNV-GL) PULS (Panel Ultimate Limit State) buckling code for the stiffened panels, DNV-GL Classification Notes (CN) No.30.1 and the DNV-GL Ship Rules. The case studied corresponds to axial compression. Two levels of imperfection tolerances are analyzed, in accordance with the specifications in the DNV-GL Instruction to Surveyors (IS) and the DNV-GL Classification Notes No. 30.1. Both "as built" and DNV-GL Rule "net" dimensions are analyzed. The strength values from ADVANCE ABAQUS and PULS are very close. DNV-GL CN 30.1 is in conservative side, but the strength differences between the "as built" and "net" dimension cases are consistent with the finite element analysis results. This paper gives a brief description of the background for the stiffened panel models used in PULS, and comparison against non-linear FE analysis, and DNV-GL Classification Society Rules. The finite element code ADVANCE ABAQUS is employed in a non-linear buckling analysis of a stiffened deck panel on a double skin tanker that is subjected to a Condition Assessment Program (CAP) hull survey. The aim of the analyses has been to validate and compare the buckling capacity estimates obtained from PULS, and the DNV-GL Ship Rules.

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“…Ozdemir et al [101] proposed a new method to predict the ultimate load capacity of the stiffened panels using the large elastic and initial yield solution. The proposed model was shown to be good enough to predict the ultimate load capacity of the stiffened panels compared with finite element solutions.…”

Section: Collapse Strength Assessmentmentioning

confidence: 99%

Collapse Strength of Intact Ship Structures

Tekgoz

Garbatov

2021

JMSE

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Ship structures are subjected to complex sea loading conditions, leading to a sophisticated structural design to withstand and avoid structural failure. Structural capacity assessment, particularly of the longitudinal strength, is crucial to ensure the safety of ships, crews, the marine environment, and the cargoes carried. This work aims to overview the ultimate strength assessment of intact ship structures in recent decades. Particular attention is paid to the ultimate strength of plates, stiffened panels, box girders, and entire ship hull structures. A discussion about numerical and experimental analyses is also provided. Finally, some conclusions and suggestions about potential future work are noted.

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

Cited by 27 publications

References 28 publications

An adaptable algorithm to predict the load-shortening curves of stiffened panels in compression

An adaptable algorithm to predict the load-shortening curves of stiffened panels in compression

Estimation of Buckling Response of the Deck Panel in Axial Compression

Collapse Strength of Intact Ship Structures

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