Equivalent shell element for ship structural design

Avi, Eero; Lillemäe, Ingrit; Romanoff, Jani; Niemelä, Ari

doi:10.1080/17445302.2013.819689

Cited by 15 publications

(4 citation statements)

References 17 publications

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“…It also accounted for ordinary stiffeners and large openings. Laminate elements were used to model the stiffened panels as equivalent shell elements [35]. Orthotropic plate elements were used to model the side shell openings [36].…”

Section: Structural Modelmentioning

confidence: 99%

“…Orthotropic plate elements were used to model the side shell openings [36]. Based on engineering experience, smaller openings and structures that do The equivalent laminate elements consisted of three layers, namely: (1) deck plate, (2) stiffener web, and (3) stiffener flange [35]. Such layers have both iso-and orthotropic material properties and axial stiffness in the direction of the stiffeners.…”

Section: Structural Modelmentioning

confidence: 99%

“…Accordingly, the deck plate layer was modeled with isotropic material properties, and the stiffener flange and web layers were suitably defined as orthotropic. The laminate elements also have out of plane shear stiffness [35]. Bulkhead structures without ordinary stiffening were modeled with plate elements having isotropic material properties.…”

Section: Structural Modelmentioning

confidence: 99%

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Springing Analysis of a Passenger Ship in Waves

Tilander

Patey²,

Hirdaris

2020

JMSE

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Traditionally, the evaluation of global loads experienced by passenger ships has been based on closed-form Classification Society Rule formulae or quasi direct analysis procedures. These approaches do not account for the combined influence of hull flexibility, slenderness, and environmental actions on global dynamic response. This paper presents a procedure for the prediction of the global wave-induced loads of a medium-size passenger ship using a linear potential flow flexible fluids interaction model. The study compares results from direct long-term hydro-structural computations against Classification Society Rules. It is demonstrated that for the specific vessel under consideration: (a) the elastic contributions of the responses on loads are negligible as springing effects occur outside of the wave energy spectrum, (b) deviations of the order of 28% arise by way of amidships when comparing direct hydrodynamic analysis predictions encompassing IACS UR S11A hog/sag nonlinear correction factors and the longitudinal strength standard, and (c) the interpretation of the wave scatter diagram influences predictions by approximately 20%. Based on these indications, it is recommended that further parametric studies over a range of passenger ship designs could help draw unified conclusions on the total influence of global and local hydrodynamic actions on passenger ship loads and dynamic response.

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Section: Structural Modelmentioning

confidence: 99%

Section: Structural Modelmentioning

confidence: 99%

Section: Structural Modelmentioning

confidence: 99%

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Springing Analysis of a Passenger Ship in Waves

Tilander

Patey²,

Hirdaris

2020

JMSE

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“…This mainly relates to the detrimental effect on the global fatigue strength caused by welding processes, which are inevitable in the assembly of the block-based, modular superstructure [3]. Part of the challenge also comes from the interaction between the local mechanical behavior of the welds and the global response of the ship [3], [4]. For this reason, recognizing the influencing factors in the ship performance is of fundamental importance.…”

Section: Introductionmentioning

confidence: 99%

A Stress Magnification Factor for Plates With Welding-Induced Curvatures

Mancini

Remes

Romanoff

2020

Volume 2A: Structures, Safety, and Reliability

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The fatigue strength of thin-walled structures can be reduced significantly by non-linear secondary bending effects resulting from geometrical imperfections such as axial and angular misalignments. The welding-induced distortions can cause a critical increase of the structural hot-spot stress in the vicinity of the weld. Traditionally, the classification society rules for the fatigue strength assessment of welded ship structures suggest an analytical formula for a stress magnification factor km for axial and angular misalignment under axial loading condition. Recently, the well-known analytical solution for the angular misalignment has been extended to account for the curvature effect. The present paper analyses the effect of non-ideal, intermediate boundary conditions between fixed and pinned ends. In this regard, the fixity factors ρ (with 0 ≤ ρ ≤ 1 from ideally pinned to clamped conditions) are introduced in order to model the actual constraint on the rotation close to the ends. Under tension, a non-negligible decrease of the km factor is observed in relation to the reduction of the fixity factor at the welded end, while the fixity factor related to the loaded end has a minor effect on the km factor. Under compression, the reduction of the beam end fixity factors results into lower buckling resistance.

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