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首页> 外文会议>SSTA(Shell Structures: Theory and Applications) Conference; 20051012-14; Jurata(PL) >Equivalent geometric imperfections for the numerical buckling strength verification of steel shell structures subject to axial compression
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Equivalent geometric imperfections for the numerical buckling strength verification of steel shell structures subject to axial compression

机译：轴向受压钢壳结构数值屈曲强度验证的等效几何缺陷

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The most sophisticated method of a numerical buckling strength verification of steel shell structures is a geometrically and materially non-linear analysis with imperfections included (GMNIA). By this way, equivalent geometric imperfections, which have to cover the influence of all deviations from the nominal dates of the resistance parameters, are fundamental for the quality of the buckling strength verification. The problem of equivalent geometric imperfections includes the problems of their shape and size. Eigenmode-affine, single wavy axisymmetric imperfections and multi-wavy axisymmetric imperfections are analysed in the paper and compared with respect to their influence on the load bearing capacity. Besides the hints regarding the imperfection mode, the Eurocode makes statements about the imperfection amplitudes, which are to be adopted. Using these imperfection amplitudes, partly substantial differences between numerically and experimentally determined buckling resistances arise for several geometries. Possibilities are discussed to overcome these inconsistencies also thin-walled shells, keeping up the framework of the Eurocode to use only geometric equivalent imperfections.
机译：验证钢壳结构屈曲强度的最复杂方法是​​几何和材料非线性分析，其中包括缺陷（GMNIA）。通过这种方式，等效几何缺陷必须覆盖抗力参数标称日期的所有偏差的影响，这对于屈曲强度验证的质量至关重要。等效几何缺陷的问题包括其形状和大小的问题。本文分析了本征模仿射，单波浪轴对称缺陷和多波浪轴对称缺陷，并比较了它们对承载能力的影响。除了关于瑕疵模式的提示外，欧洲规范还对瑕疵幅度作了陈述，这些陈述将被采用。使用这些缺陷幅度，对于几种几何形状，在数值上和实验上确定的屈曲阻力之间会产生部分实质性差异。讨论了克服这些不一致的可能性以及薄壁壳体的可能性，从而使Eurocode的框架得以保留，仅使用几何等效缺陷。

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