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Measurement and Assessment of Geometric Imperfections in Thin-walled Panels


Bernard, ES and Coleman, R and Bridge, RQ, Measurement and Assessment of Geometric Imperfections in Thin-walled Panels, Thin-Walled Structures, 33, (2) pp. 103-127. ISSN 0263-8231 (1999) [Refereed Article]

DOI: doi:10.1016/S0263-8231(98)00043-3


Thin-walled members may be subject to performance limitations arising through local or distort!onal buckling of slender elements comprising the cross-section of the member, or over-all buckling of the member. The effects of structural instability may be aggravated by the presence of geometric imperfections in these elements. An investigation is presented into methods of measuring and assessing geometric imperfections in cold-rolled thin-walled steel panels. These methods can be used to characterise the geometry of prismatic thin-walled members that exhibit performance sensitivity due to geometric imperfections. The measurement procedures investigated include close-range photogrammetry, precise optical levelling, and the use of a co-ordinate measurement machine. The assessment procedure comprises a leastsquares spectral decomposition of the measurements to characterise the imperfections existent in the panels under investigation, and estimates of the precision of the derived Fourier coefficients are used to inter-compare the three measurement procedures. The investigation has demonstrated that statistically significant imperfections may exist in thin-walled members at short and medium wavelengths, leading to a reduction in the load carrying capacity. Both optical levelling and the co-ordinate measurement machine technique can yield desirable results, but for high precision work, use of the co-ordinate measurement machine is recommended. © 1999 Elsevier Science Ltd. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Engineering
Research Group:Civil engineering
Research Field:Structural engineering
Objective Division:Construction
Objective Group:Construction materials performance and processes
Objective Field:Metals
UTAS Author:Coleman, R (Professor Richard Coleman)
ID Code:16304
Year Published:1999
Web of Science® Times Cited:21
Deposited By:Geography and Environmental Studies
Deposited On:1999-08-01
Last Modified:2000-06-28

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