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
复制标题
模拟等效几何缺陷进行轴向压缩圆柱钢壳屈曲强度数值验证
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
W. Schneider
中科院分区：
文献类型：
--
作者：
W. Schneider
考虑缺陷的几何和材料非线性分析（GMNIA）是目前最复杂和最精确的屈曲强度数值验证方法。通过这种方式，等效的几何缺陷，它必须涵盖的阻力参数的标称数据的所有偏差的影响，是基本的。一致等效几何缺陷问题包括缺陷的形状和尺寸问题。建议从完整结构的失效模式出发，得到不利于抗屈曲的缺陷模式，这些缺陷模式与制造有关且易于使用。现行规范对缺陷长度的影响没有给予足够的重视。对于轴压圆柱壳的基本屈曲情况，建议用理想环屈曲模态的全波长作为等效几何缺陷的缺陷长度。最后，建议一致的等效几何缺陷振幅的这种屈曲情况。
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.