Cylindrical members in offshore structures

Chen, W.F.; Sohal, I.

doi:10.1016/0263-8231(88)90010-9

Cited by 20 publications

(6 citation statements)

References 26 publications

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“…Furthermore, it is worth noting that Chen and Sohal (1988) have given an empirical formula for the critical curvature of the local buckling of a tube bent in the plastic range. The author has shown (Farkas 1990b) that this formula gives values which agree well with 5L.pl-Values according to (13) or (13a).…”

Section: Lmentioning

confidence: 99%

“…In the study by Chen and Sohal (1988) the postbuckling behaviour is described on the basis of the results obtained by numerical methods (see Section 5.1). Since the combination of these numerical methods with the optimum design procedure would be too complicated, for our purposes it is sufficient to use the relatively simple closed formula de-rived by Supple and Collins (1980).…”

Section: Aspects Of Optimizationmentioning

confidence: 99%

“…Recent analytical and experimental research results have described the elastic, elasto-plastic and plastic behaviour of tubes loaded in compression and bending (Chen and Sohal 1988). The author's aim is to complete these analytical investigations by optimization studies to show designers how to determine structural versions which satisfy not only the design constraints, but also the economic aspects.…”

mentioning

confidence: 98%

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Optimum design of circular tubes loaded in compression in preand post-buckling ranges

Fárkas

1992

Structural Optimization

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Based on Kuhn-Tucker optimality criteria, using a grapho-analytical method, simple closed formulae are given for optimal diameter and thickness of centrally compressed struts of circular hollow section. These dimensions minimize the crosssectional area and fulfill the design constraints. In the prebuckling range overall and local elastic buckling constraints are defined. In the post-buckling range the optimal sizes can be calculated using the formulae valid for the prebuckling range, but instead of the limiting D/t-ratio, valid for semi-compact tubes, the plastic limiting D/t-ratio should be used to avoid local buckling. The comparative calculations show the mass savings achievable by using a higher-strength steel as well as the larger axial shortening of struts made of higher-strength steel.

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Section: Lmentioning

confidence: 99%

Section: Aspects Of Optimizationmentioning

confidence: 99%

mentioning

confidence: 98%

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Optimum design of circular tubes loaded in compression in preand post-buckling ranges

Fárkas

1992

Structural Optimization

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“…The cylindrical tubular members are predominant in these offshore structures because of several reasons. They minimize hydrodynamic forces, have high torsional rigidity, and offer great local strength against impact loading [1]. The exposure of these elements to the marine environment without adequate protection may lead to corrosion process, which over time can reach advanced degradation levels that the structure was not designed to withstand.…”

Section: Introductionmentioning

confidence: 99%

Ultimate bending capacity of perforated pipe cross sections

Knupp

Vaz

Cyrino

2019

Mar Syst Ocean Technol

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The aim of this work is to derive analytical solutions for the remaining capacity of perforated tubular structures, which are subjected to combined loading of bending and tensile or compressive stresses. Effects of internal pressure and loads of thermal origin are not considered. Parametric study addresses the increase in the cross section ultimate bending capacity when considering strain hardening effects compared to the assumption of elastic-perfectly plastic material. The need for operation extension for longer periods than initially foreseen, the possibility of relocation and reuse of these structures, for example, has motivated studies related to the structural integrity of these members and their subcomponents. It is sought to present formulations that help the decision-making to repair or replace deteriorated elements identified in inspections, in view of the economic impact coming from offshore works and, mainly, from possible production losses. Keywords Remaining capacity • Perforated structures • Combined loading • Strain hardening t Pipe cross section thickness y c Distance between centroid of compressive area and centroid of whole pipe cross section y t Distance between centroid of tensile area and centroid of whole pipe cross section Z P Plastic section modulus * Andressa Baptista Knupp

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“…Most of the relevant literature dates back to the XX century, when many authors investigated on buckling of thin cylindrical shells [3,4,5]. It was found that the buckling behaviour of cylindrical shells subjected to bending depends on the material parameters as well as geometric parameters, especially the diameter-thickness ratio D/t [6].…”

Section: Introductionmentioning

confidence: 99%

Novel stiffeners exploiting internal pressurisation to enhance buckling behaviour under bending loads

Polenta

Garvey

Chronopoulos

et al. 2016

Thin-Walled Structures

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The paper proposes a novel type of stiffener designed to bear bending loads by exploiting internal pressure effects. The stiffener is made of two adjacent thin-walled pipes (r/t ≥ 50) jointed with a connecting strip. Such structure is shown to have higher performance against buckling failure compared to a single pipe and its geometry allows for good exploitation of internal pressurisation.The study is conducted by using the FEA software ANSYS and the analysis technique is the linear perturbation buckling analysis. Internal pressure ranges from 0 to 1.4 MPa. The buckling mechanisms are observed for a set of models with different values of length, wall thickness and geometric variation of the cross-section. It is shown that two different buckling modes can take place. However, for a given geometry, the level of pressure can alter the behaviour and lead to one mode rather than the other one.Potential of the presented structure is maximised by the use of high performance materials and a possible aerospace engineering application is presented.

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Cylindrical members in offshore structures

Cited by 20 publications

References 26 publications

Optimum design of circular tubes loaded in compression in preand post-buckling ranges

Optimum design of circular tubes loaded in compression in preand post-buckling ranges

Ultimate bending capacity of perforated pipe cross sections

Novel stiffeners exploiting internal pressurisation to enhance buckling behaviour under bending loads

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