PSI - Issue 64
Margherita Autiero et al. / Procedia Structural Integrity 64 (2024) 1798–1805 Author name / Structural Integrity Procedia 00 (2019) 000–000
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showed that collapse time for this type of structure is of the order of a few minutes, and to study it is essential not only to carry out advanced analyses refining them as much as possible, for example, in the field of non-uniform temperature distribution and all the instability phenomena. Moreover, the analyses stopped at the collapse of the most stressed elements, and for this reason, it was not possible to analyze the real global collapse and the correct collapse time. This is due to the type of analyses that SAFIR allows to implement which are dynamic implicit analyses that stop when convergence problems are reached. Since ARSWs are characterized by elements with a reduced deformed capacity (class 4 sections), that does not allow the development of a full plastic stress distribution in the section and leads to an incomplete plastic redistribution along the members in the structure. Therefore, to correctly estimate the fire collapse times and the shape of the global mechanism, to go beyond the time of collapse provided by SAFIR or implicit analysis is necessary, manually eliminating the elements that collapse. The reliability of this iterative procedure, based on subsequent implicit analyses, will be examined, and validated by modelling the same structure with another structural software, ABAQUS CAE, that allows the implementation of both implicit and explicit analyses. References Bernuzzi, C., Draskovic, N., Simoncelli, M., 2015. European and United States approaches for steel storage pallet rack design. Part 2: practical applications. Thin-walled Structures vol. 97, pp.321–341. Caprili, S., Morelli, F., Salvatore, W., Natali, A., 2018. Design and Analysis of Automated Rack Supported Warehouses, Open Civil Engineering Journal, vol. 12, no. 1, pp. 150-166. CEN European Committee for Standardization. 2009. 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