Challenges in the computation of lower-bound buckling loads for tanks under wind pressures
Author: Eduardo M. Sosa, Luis A. Godoy | Size: 728 KB | Format:PDF | Quality:Unspecified | Publisher: Elsevier | Year: 2010 | pages: 11
This paper reports on the implementation of a lower-bound approach for the buckling of imperfection-sensitive shells using general purpose finite element codes. The stability of cylindrical steel tanks under wind pressure is evaluated for two tank configurations: conical roof tanks and open top tanks. For both tank configurations, several geometric relations are considered in order to find the variation of the knock-down factor as the geometry changes. The reduced energy method is implemented to compute a lower-bound for critical wind pressures and the results are compared with the static non-linear analysis carried out on the same models. An alternative way to implement the reduced energy method is presented to improve the results obtained with the proposed methodology
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The progress of non-linear FE-methods allows it nowadays to simulate the load-bearing behaviour
of steel shells taking geometric and material nonlinearities and imperfections into account. In this
paper it is investigated for the basic buckling case of uniform external pressure, which equivalent
geometric imperfections have to be applied in the numerical analysis (GMNIA) to achieve the
experimentally determined buckling resistances. Single longitudinal imperfections are better suited
than eigenform-affine initial deformations. Proposals for the imperfection amplitude and
imperfection width are submitted. The results are compared with the regulations of the Eurocode.
Essential modifications are discussed.
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A reduced stiffness approach for the buckling of open cylindrical tanks under wind loads
Author: Rossana C. Jacaa, Luis A. Godoyb, Fernando G. Floresb, James G.A. Croll | Size: 660 KB | Format:PDF | Quality:Unspecified | Publisher: Elsevier | Year: 2007 | pages: 10
This paper reports on the implementation of a lower bound approach to the buckling analysis of cylindrical shells for tanks subjected
to wind loads. The formulation is based on a reduced energy model of the shell adapted to a special purpose, semi-analytical, finite
element program in which it is possible to separately compute the membrane and bending energy contributions. First, the energy
components are investigated, in order to identify stabilizing and destabilizing contributions. Second, an eigenvalue analysis is carried out
using a reduced value of the stiffness, in which membrane components are eliminated on the basis that they are assumed to be eroded as a
result of mode coupling catalyzed by imperfections. The methodology is employed for thin-walled, above ground, tanks under wind
pressures. It is shown that the resulting critical loads constitute lower bounds to those obtained using a nonlinear analysis of the shell,
including imperfections, and also to those obtained from experiments.
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The wind-induced buckling of thin-walled steel cylinders, such as silos and
tanks, was investigated by wind-tunnel testing for a limited range of the
parameters. While wind-buckling of short, stocky shells can be well represented
by an equivalent uniform external pressure, long shells show quite a
different behaviour, which is strongly influenced by the axial compression
forces. This paper presents a study of this behaviour, based on numerical
analyses and considering various types of imperfection shape. The effect of
geometrical nonlinearity, as well as material plasticity, has also been
included. A comparison with test results shows good agreement with the
numerical results of imperfect shells, provided that special eigenmodeshaped
modes of imperfections are excluded.
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Specimen Calculation of 3 bay Car shed of HDPE mesh
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Calculation report of a HDPE mesh car park structure 3 bay example in SAP
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