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04.09: Cylindrically curved steel panels in bridge design: Buckling and post‐buckling behaviour under shear stresses
Author(s) -
Ljubinković Filip,
Martins João Pedro,
da Silva Luís Simões
Publication year - 2017
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.129
Subject(s) - buckling , curvature , structural engineering , stiffness , aspect ratio (aeronautics) , materials science , shear (geology) , drop (telecommunication) , critical load , composite material , mathematics , geometry , engineering , telecommunications
The main goal of this work is to investigate the behaviour of the cylindrically curved steel panels subjected to pure in‐plane shear stresses. The most relevant works regarding the simply supported curved panels under shear stresses were firstly revised and based on these studies the numerical models were calibrated. As one of the main objectives of this study, the influnce of aspect ratio and curvature parameter on both elastic buckling and post‐buckling behavior of curved panels was analysed. Regarding the curvature parameter, it was concluded that the higher curvatures in general lead to the increased critical buckling load and moreover to the shell‐like behaviour, which result in rather unstable post‐critical behaviour. As for the aspect ratio effect, due to the reduction of the initial stiffness, the higher aspect ratios lead to the drop in buckling load, and thus also lower post‐buckling reserves. On the other hand, the curved panels with low aspect ratio, showed a behaviour similar to the panels with the high curvatures parameters, which is characterized by sudden drop in bearing capacity and huge deflections after the critical load is reached. Furthermore, using the fully non‐linear numerical simulations, the imperfection sensitivity of the curved panels was examined, where, in particular, shape, amplitude and sign of the imperfections were varied. It was concluded that the panels with the higher curvatures as well as the non‐squared panels are more sensitive to the imperfections. Concerning the shape effect, it is more emphasized in case of the panels with the smaller radii, where it may have an impact on the post‐buckling behaviour. Finally, regarding the sign of the imperfections, it was proven that both directions of imperfections have to be verified in order to obtain the most unfavourable behaviour. The sign sensitivity is particularly noticed for the panels which buckle in symmetric buckling mode.