Ultimate strength of Y and T stiffeners subjected to lateral loads with three different levels of initial imperfection

Badran, Sherif Farouk; Saddek, Amr B.; Leheta, H

doi:10.1016/j.oceaneng.2012.12.022

Cited by 12 publications

(10 citation statements)

References 17 publications

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“…The physical properties of the stiffener models are defined; the density is 7.85×10 -6 kg/mm 3 , Young's modulus is 206,000 N/mm 2 , and Poisson's ratio is 0.3 (Badran et al, 2013). As mentioned in section 4, an analytical solution focused on a linear elastic range of material, so this section neglected the value of the yield stress.…”

Section: Specifying Materials Properties and Boundary Conditionmentioning

confidence: 99%

“…Nonconventional stiffeners have also been used in ship and offshore structure design and construction for many years, e.g., rectangular box stiffeners, Hat stiffeners, and N and M stiffeners. Moreover, new types of non-conventional stiffeners have been studied and applied in a midship section of a double-hull oil tanker to simulate the ultimate strength, which is defined as the Y-stiffener type, as shown in Figure 1(a) (Badran et al, 2013). The study obtained a comparison of the displacement result between T stiffeners and Y-stiffeners subjected to lateral loads.…”

Section: Introductionmentioning

confidence: 99%

“…ANSYS software has been used to design the plates of a ship, and static numerical analysis has been done based on nonlinear finite element theory (Saad-Eldeen et al, 2016). The material properties of the stiffener models were defined by Badran et al (2013). The response of Euler-Bernoulli beams and stiffen panels with a given Young's modulus and Poisson ratio have been analysed (Sofi & Muscolino, 2015;Tanaka et al, 2014;Xu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Comparison the Stiffened Plate Deflection of T and RSF Stiffeners on Marine Structure Subjected Force and Pressure

Reabroy

2020

Marit. Technol. Res.

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This work aims to compare the vertical deflection between perfect T and Rectangular Support Flange (RSF) stiffeners when subjected to forces and pressures. The geometry of stiffener models comprises the conventional T stiffener model design, used in double hull oil tankers, and the RSF stiffener, which is of a modified type whose design is based on T stiffener specifications. The deflection theories of simply supported beam were studied by the double integral method. Finite Element Analysis (FEA) is used to design and simulate the vertical deflection and the maximum equivalent stress of stiffeners when subjected to force and pressure under the same boundary condition. Various stiffener models are studied, and the FEA results presented graphically. The theoretical and FEA results are in good agreement. The load-deflection curves show that the performance of the RSF stiffener is superior to that of the conventional T stiffener.All rights reserved

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Section: Specifying Materials Properties and Boundary Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison the Stiffened Plate Deflection of T and RSF Stiffeners on Marine Structure Subjected Force and Pressure

Reabroy

2020

Marit. Technol. Res.

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“…Most of the recent studies are based on numerical simulations employing geometrically and materially Nonlinear Finite Element Method (NLFEM) analyses, e.g. Xu et al (2012Xu et al ( , 2013, , Ozdemir & Ergin (2013), Badran et al (2013), Tanaka et al (2014), Gannon et al (2012), Tekgoz et al (2013), , Doshi & Vhanmane (2014), Choung et al (2014), , although some of the recent studies include experimental testing, e.g. Xu & Guedes Soares (2012a, b, 2013a, Shanmugam et al (2014).…”

Section: General Remarksmentioning

confidence: 99%

Progressive collapse analysis of a bulk carrier using IACS prescribed and NLFEM derived load—end shortening curves

Kitarović¹,

Andrić²,

Pirić³

et al. 2015

Towards Green Marine Technology and Transport

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This paper considers hull girder ultimate strength of a bulk carrier at its midship section, as determined by an incremental-iterative progressive collapse analysis method prescribed by the IACS Common Structural Rules for Bulk Carriers (IACS CSR-BC). In addition to the originally prescribed load-end shortening curves, curves determined by the nonlinear finite element method analysis (considering the influence of the idealized initial geometrical imperfections) are also considered. Results obtained by both sets of curves are compared and discussed on both local (structural components load-end shortening curve) and global (hull girder ultimate bending capacity and collapse sequence) level, for both sagging and hogging cases.of the hull girder submitted to bending. PCA methods are based on evaluation of the (nonlinear) bending moment to curvature relationship which describes the hull girder progressive collapse (for sagging and/ or hogging cases), which is induced by yielding and/ or various feasible buckling modes of the uncoupled discrete structural components (longitudinal stiffeners with the attached breadth of plating, hard corners and transversely stiffened plating) of the critical segment (between two adjacent transverse web frames).

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“…Badran et al (2013) compared the ultimate strength of Y-and T-stiffeners subjected to lateral loads considering the effect of three initial imperfection levels. Utilising El-Hanafi et al (2013) methodology, performed an extensive analytical study comparing different Y-stiffener profiles against the conventional ones in both deck and bottom stiffened panels.…”

Section: Introductionmentioning

confidence: 99%

Reliability analysis of novel stiffened panels using Monte Carlo simulation

Leheta

Elhanafi

Badran

2016

Ships and Offshore Structures

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The present study aims to perform reliability analyses using Monte Carlo simulation to compute and compare the time-invariant reliability indices of stiffened panels with either conventional T-stiffeners or novel Y (Hat + Tee/Angle) stiffeners profiles in a double hull oil tanker's bottom and deck panels under axial compressive loads. The ultimate strength and the applied axial compressive stress formulations used in the limit state functions are obtained based on the International Association of Classification Societies-Common Structural Rules for oil tankers considering the following failure modes: unstiffened plate buckling, stiffener beam-column buckling, and stiffener torsional/flexural buckling (tripping). With the Y-stiffeners profile, a considerable improvement in the panels' reliability index throughout the vessel lifetime is achieved.

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Ultimate strength of Y and T stiffeners subjected to lateral loads with three different levels of initial imperfection

Cited by 12 publications

References 17 publications

Comparison the Stiffened Plate Deflection of T and RSF Stiffeners on Marine Structure Subjected Force and Pressure

Comparison the Stiffened Plate Deflection of T and RSF Stiffeners on Marine Structure Subjected Force and Pressure

Progressive collapse analysis of a bulk carrier using IACS prescribed and NLFEM derived load—end shortening curves

Reliability analysis of novel stiffened panels using Monte Carlo simulation

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