Stability of steel shell structures

Schmidt, Herbert

doi:10.1016/s0143-974x(99)00084-x

Cited by 104 publications

(38 citation statements)

References 22 publications

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“…Moreover, it corresponds to the suggestion in [12], not to use "worst" imperfections, which are not certainly traceable or even improbable at real shells, but simple equivalent geometric imperfections, which are technically relevant and which initiate the buckling process ("stimulating" geometric imperfections).…”

Section: Pattern Of the Equivalent Geometric Imperfectionsupporting

confidence: 69%

Stimulating Equivalent Geometric Imperfections for the Numerical Buckling Strength Verification of Axially Compressed Cylindrical Steel Shells

Schneider

2005

Comput Mech

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A geometrically and materially nonlinear analysis with imperfections included (GMNIA) is currently the most sophisticated and perspectively the most accurate method of a numerical buckling strength verification. By this way, equivalent geometric imperfections, which have to cover the influence of all deviations from the nominal data of the resistance parameters, are fundamental. The problem of consistent equivalent geometric imperfections includes the problems of their shape and size. It is recommended to start from the failure modes of the perfect structure in order to get imperfection patterns, which are unfavourable with respect to buckling resistance, relevant referring to manufacture and easy to use. The influence of the imperfection length is not sufficiently attended in the present design codes. It is proposed to use the full wave length of the ideal ring buckling mode as the imperfection length of the equivalent geometric imperfection for the basic buckling case of the axially compressed cylindrical shell. Finally, proposals are made for consistent equivalent geometric imperfection amplitudes of this buckling case.

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Section: Pattern Of the Equivalent Geometric Imperfectionsupporting

confidence: 69%

Stimulating Equivalent Geometric Imperfections for the Numerical Buckling Strength Verification of Axially Compressed Cylindrical Steel Shells

Schneider

2005

Comput Mech

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“…spheres and cylinders) prove to have the highest imperfection sensitivity. Several papers deal with the problem of finding the initial imperfection connected to the lowest ultimate load of cylindrical structures [23][24][25][26][27][28]. In the early stages of imperfection studies on cylinders, the analogy to column and plate buckling was considered appropriate and therefore the imperfection affine to the lowest eigenmode was taken as the worst initial imperfection.…”

Section: Thin-walled Cylindermentioning

confidence: 99%

“…Among them one can basically distinguish between those which are derived from the hypothesis that it is possible to obtain a sufficiently accurate structural response for an imperfect structure from the properties of a perfect structure ("perturbation approach") and those which obtain the structural response by analyzing the imperfect structure itself ("direct approach"). The review of different approaches accompanied with an impact on modern design procedures of engineering structures can be found in Schmidt [24].…”

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confidence: 99%

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Optimization method for the determination of the most unfavorable imperfection of structures

Kristanič

Korelc

2008

Comput Mech

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The paper presents an optimization method for direct determination of the most unfavorable imperfection of structures by means of ultimate limit states. When analyzing imperfection sensitive structures it turns out that the choice of the shape and size of initial imperfections has a major influence on the response of the structure and its ultimate state. Within the optimization algorithm the objective function is constructed by means of a fully nonlinear direct and first order sensitivity analysis. The method is not limited to small imperfections and also allows the imposition of "technological" constraints on the shape of the imperfection, thus making it possible to avoid unrealistically low ultimate loads. When carefully constructed, the objective function and constraints remain linear enabling the use of numerically efficient and readily available linear programming algorithms. Imperfection analyses are shown for thin-walled girders and a cylinder to demonstrate the applicability and efficiency of the proposed method.

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“…The calculations were limited to two very important, independent load factors occurring in silo structures: negative pressure and wind. The choice of the loading has been suggested in Eurocodes [3] and [4] as well as in many papers on the subject (e. g. [9], [10], [14]). In the case of wind load, the probability distribution of its direction (described by the actual data) was also taken into account.…”

Section: Introductionmentioning

confidence: 99%

Effect of geometric imperfections on aluminium silo capacities

et al. 2014

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An aluminium silo with initial imperfections is analysed. Two types of imperfection are considered. The first one takes the form of local indentations in the shell; their size and range are adopted on the basis of the standard guidelines. The second type is a global imperfection described through the use of its eigenforms and by means of two-dimensional random fields. The calculations are limited to two cases of loading: negative pressure and wind. The choice of the loading has been suggested in Eurocodes. In the case of wind load, the probability distribution of its direction is taken into account. Einfluss geometrischer Imperfektionen auf die Belastbarkeit von Aluminium-Silokonstruktionen. Ein Aluminium-Silo mit anfängli-chen Imperfektionen wird untersucht. Zwei Typen von

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Stability of steel shell structures

Cited by 104 publications

References 22 publications

Stimulating Equivalent Geometric Imperfections for the Numerical Buckling Strength Verification of Axially Compressed Cylindrical Steel Shells

Stimulating Equivalent Geometric Imperfections for the Numerical Buckling Strength Verification of Axially Compressed Cylindrical Steel Shells

Optimization method for the determination of the most unfavorable imperfection of structures

Effect of geometric imperfections on aluminium silo capacities

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