Dynamic Analysis and Seismic Responses of Industrial Rack Structures with Perforated Cold-formed Steel Columns using Line Elements
Ziemian, Ronald D.
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Industrial rack structures with perforated cold-formed steel columns and braces are extensively used in high seismic intensity regions, whose dynamic responses under transient excitations should be carefully evaluated for ensuring structural safety. Nevertheless, it is difficult to robustly analyze such structural systems comprised of monosymmetrical open-section members, mostly because of their complicated cross-section shapes with non-coincidence of shear centre and centroid for inducing the Wagner’s effects and complex buckling modes. Until now, there was no free and easy-to-use computer program available for frames with considering these features, especially for seismic design of industrial rack structures. Recent research, developing efficient line element formulations, has made substantial progress in simulating the buckling behavior of nonsymmetrical section members for both static and dynamic loads. These new element formulations have been implemented into a newer version of the educational analysis software MASTAN2-v5.1, which is introduced for the transient analysis of the industrial rack with perforated cold-formed steel columns for evaluating their seismic responses. The numerical algorithms, including mathematical derivations, are illustrated in brief. An efficient method for considering perforations on the column is proposed, where the steel plate thickness is reduced for such considerations. Validation examples are given, where the numerical method using shell elements are used to generate the benchmark solutions. In this study, some additional features such as the treatment of thin-walled perforated columns, axially and flexural semi-rigid connections are explored. The common industrial rack structures are studied for evaluating the dynamic responses under typical earthquake excitations, that can provide useful information for their applications in high seismic intensity regions.