NUMERICAL BUCKLING STRENGTH VERIFICATION OF CYLINDRICAL STEEL SHELL STRUCTURES SUBJECT TO COMBINED LOADING
NUMERICAL BUCKLING STRENGTH VERIFICATION OF CYLINDRICAL STEEL SHELL STRUCTURES SUBJECT TO COMBINED LOADING
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DOI：
10.1142/s0219455407002265
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发表时间：
2007-06
影响因子：
3.6
通讯作者：
W. Schneider;M. Gettel
中科院分区：
文献类型：
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作者：
W. Schneider;M. Gettel
在壳体承载能力的数值计算中，必须考虑阻力参数与标称值之间不可避免的偏差，因为这些结构对阻尼非常敏感。假设的缺陷是数值屈曲强度验证的基础，因为它们必须以一致的方式覆盖结构的所有意外缺陷的影响。在过去的几年里，对于圆柱形钢壳的基本屈曲情况，已经提出了一致的等效几何缺陷。壳体承受复合载荷的情况比较困难，因为没有太多的实验数据。基本问题和以前的建议，假设在组合加载等效缺陷的贡献进行了讨论。特别是，是否必须在不考虑载荷情况的情况下选择等效几何缺陷是一个有争议的问题，因为真实的壳体的缺陷是由制造而不是由载荷引起的。给出了原因，为什么这是不适用于在数值模拟的等效缺陷。在基本屈曲情况下已经证明的拟塌陷仿射缺陷的概念也可以应用于复合载荷下的壳体。
The inevitable deviations from the nominal data of the resistance parameters have to be included in a numerical calculation of the load-bearing capacity of shells, because these structures are very imperfection-sensitive. The assumed imperfections are fundamental for the numerical buckling strength verification, because they have to cover the influence of all accidental imperfections of the structure in a consistent manner. Consistent equivalent geometric imperfections have been developed during the last years for the basic buckling cases of the circular cylindrical steel shell. The situation at shells subject to combined loading is more difficult, because not so much experimental data is available. Fundamental problems and previous proposals for assuming equivalent imperfections at combined loading are discussed in the contribution. In particular, it is a moot point whether the equivalent geometric imperfections have to be chosen without regard to the load case, because imperfections of real shells are caused by manufacturing and not by loading. Reasons are given for, why this is not applicable at equivalent imperfections of a numerical simulation. The conception of quasi-collapse-affine imperfections, which has already been proved at the basic buckling cases, can also be applied to shells under combined loading.