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Publication
Investigation of residual stresses on the fire resistance of unrestrained cellular beams
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Advisor(s)
Abstract(s)
It is being a common engineering practice to use steel beams with web openings in buildings requiring
long spans, besides giving an important additional advantage of allowing services through instead of
underneath the beams. The presence of these openings is penalizing the carrying capacity at ambient
temperature and in the case of fire due to large cells and double nonlinearity geometric and material a
complex behaviour take place. In this study, numerical models for beams having closely spaced large
openings are simulated with ISO834 fire loading including both nonlinearities cited above in the primal
investigation. Followed as a second investigation, is the effect of residual imperfections added to the
numerical model mentioned above and simulated for different diagrams as presented within updated
literature. All simulations were done using the finite element software ANSYS, to analyse the results
captured for lateral torsional buckling (LTB) behaviour in terms of vertical and lateral displacement, von
Mises stresses for different sections at ambient and fire conditions. For this parametric study, the change
in cross-section geometries, opening spacing, beam length on the LTB of cellular beams is analysed.
Description
Keywords
Cellular beam Residual stress Fire Lateral torsional buckling
Pedagogical Context
Citation
Oribi, Sabrina Benyettou; Kada, Abdelhak; Lamri, Belkacem; Mesquita, L.M.R. (2021). Investigation of residual stresses on the fire resistance of unrestrained cellular beams. In The online collection for conference papers in civil Engineering. 4:2-4, p. 1386-1394