A parametric study on the dynamic ultimate strength of a stiffened panel subjected to wave- and whipping-induced stresses

Jagite, George; Bigot, Fabien; Derbanne, Quentin; Malenica, Šime; Sourne, Hervé Le; Cartraud, Patrice

doi:10.1080/17445302.2020.1790985

Cited by 10 publications

(5 citation statements)

References 29 publications

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“…Methods for the evaluation of ultimate hull girder strength may be classified as simplified or advanced methods. The advanced methods, such as the idealized structural unit method (ISUM) or the nonlinear finite element (FE) method, are based on a direct approach and allow for the analysis of more realistic failure mechanisms and loading scenarios, as presented by [21,29] and others. In the simplified methods, the hull girder's ultimate strength is approximated from yielding and elastic considerations, which, in many cases, rely on analytical calculations and empirical data.…”

Section: Methodsmentioning

confidence: 99%

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A Design Method to Assess the Primary Strength of the Delta-Type VLFS

Gafter

Drimer

2021

JMSE

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Very large floating structure (VLFS) is a sustainable concept centered around creating solid platforms at sea. The Delta is a new type of VLFS, designed to withstand open-sea conditions and to form, in addition to a broad deck areas, a sheltered basin of year-round operability. The design of this unique hull relies on direct calculations in order to identify critical load cases and assess their load effects. This study formulates a theoretical procedure for the initial assessment of the primary strength. The procedure analytically integrates the floatation loads while the hull rests at hydrostatic equilibrium on a wave surface and obtains the vertical and horizontal bending moment. This preliminary assessment tool enables a fast review of many load cases and provides the basic insights necessary for a reasonable initial design. Using the procedure, we conducted a primary load assessment for the design of Delta. By calculating the load response to 588 load cases, we identified the critical load scenario and the maximal axial stress. As the stress was too high, we improved the geometry in order to reduce loads and assessed proper scantlings for the critical section. We present the formulation of the procedure, the validation of the results, and the implementation for the structural design of the Delta VLFS.

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Section: Methodsmentioning

confidence: 99%

“…Geometric simplification, wave loading assumptions, and application of beam theory that are used in this analysis method date back almost two hundred years. In the early stages of design, such procedures are still widely use today [29,30].…”

Section: Methodsmentioning

confidence: 99%

A Design Method to Assess the Primary Strength of the Delta-Type VLFS

Gafter

Drimer

2021

JMSE

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“…The LSD [16] includes ultimate limit state (ULS), fatigue limit state (FLS), accidental limit state (ALS), and serviceability limit state (SLS). Among others, a number of studies have been conducted on ULS-based design, technique, and its applications in terms of ULS application to stiffened panels [36][37][38][39], scaling effect [40,41], stiffened panels with opening [42], dynamic ULS [43], low temperature effect [14], and prediction of ULS by an artificial neural network (ANN) [44]. The FLS of an offshore riser by an ANN and simplified method [45,46], the ALS and ULS of a non-ice class aged ship [4,47], a steel plated structure [3], a ship's hull [2], and Floating Liquefied Natural Gas (FLNG) [48,49] are also investigated.…”

Section: Ultimate Strength Calculations By the Non-linear Finite Element Methods (Nlfem)mentioning

confidence: 99%

Ultimate Compressive Strength of Stiffened Panel: An Empirical Formulation for Flat-Bar Type

Kim

Lim

et al. 2020

JMSE

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This research aims to study the ultimate limit state (ULS) behaviour of stiffened panel under longitudinal compression by a non-linear finite element method (NLFEM). There are different types of stiffeners mainly being used in shipbuilding, i.e., T-bar, flat-bar, and angle-bar. However, this research focuses on the ultimate compressive strength behaviour of flat-bar stiffened panel. A total of 420 reliable scenarios of flat-bar stiffened panel were selected for numerical simulation by the ANSYS NLFEM. The ultimate strength behaviours obtained were used as data for the development of closed form shape empirical formulation. Recently, our group proposed an advanced empirical formulation for T-bar stiffened panel, and the applicability of the proposed formulation to flat-bar stiffened panel is confirmed by this study. The accuracy of the empirical formulation obtained for flat-bar stiffened panel was validated by finite element (FE) simulation results of statistical analysis (R2 = 0.9435). The outcome obtained will be useful for ship structural designers in predicting the ultimate strength performance of flat-bar type stiffened panel under longitudinal compression.

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“…Liu et al [18] studied the dynamic failure of rectangular plates under lateral impact via impact experiments and FE analysis. Jagite et al [19] studied the dynamic ultimate load capacity of the stiffened plates under axial compression and lateral load in a parameterized way. Load values obtained by parameterization are more consistent with those measured under real-world conditions.…”

Section: Introductionmentioning

confidence: 99%

A Two-Step Approach for Evaluating the Dynamic Ultimate Load Capacity of Ship Structures

Zhang,

Cui,

Wang

2024

JMSE

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One important parameter for evaluating the safety and reliability of a ship is o the dynamic ultimate load capacity of ship structures. Because of the importance of this parameter, its determination is essential. In this paper, a novel “two-step” approach for determining the dynamic ultimate load capacity of ship structures is proposed. The main idea of two-step approach is to determine the dynamic ultimate load capacity based on the static ultimate load capacity after accounting for impacts that cause strain on the ship structures. This approach is based on nonlinear finite element method. Here, taking stiffened plate as a case study, the practical application of thus two-step approach is discussed in detail. The results of this approach reveal that the static ultimate load capacity decreases by less than 3% after a stiffened plate is subjected to an impact load whose amplitude corresponds to the dynamic ultimate load capacity. Then, the influence of the impact duration on the failure mode and the effect of the impact load cycles and the impact load sequence on the dynamic ultimate load capacity of the stiffened plate were investigated. Finally, the applicability of the two-step approach to a hull girder is demonstrated. The two-step approach and the conclusions presented in this paper can provide guidance for the evaluation of dynamic ultimate load capacity.

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A parametric study on the dynamic ultimate strength of a stiffened panel subjected to wave- and whipping-induced stresses

Cited by 10 publications

References 29 publications

A Design Method to Assess the Primary Strength of the Delta-Type VLFS

A Design Method to Assess the Primary Strength of the Delta-Type VLFS

Ultimate Compressive Strength of Stiffened Panel: An Empirical Formulation for Flat-Bar Type

A Two-Step Approach for Evaluating the Dynamic Ultimate Load Capacity of Ship Structures

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