3D Second Order Analysis of Industrial Buildings

Second orders effects were included historically by the effective length method (K concept), all the studies about that methodology were developed in frames on plane, and with regular rectangular frames. The new way to include those effects is the uses of second order analysis, direct analysis method or alternative simplified options. This methodology was included in ANSI AISC360 in the 2005 version an in the 2010 version. As before, the studies already developed for DAM analysis are in plane. In this paper is revisited the “K concept”, by numerical analysis, and extended to the 3D space. Using models of industrial steel structures symmetric and nonsymmetric, plane and 3D stability analysis were developed, and the results are compared with plane behavior. Several conclusions and recommendations are exposed in lieu of the analyzed models.

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