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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Specifying Tolerance Limits for
Meridional Imperfections in Cooling
Author(s): J. G. A. Croll and K. 0. Kemp
Publication: Journal Proceedings
Appears on pages(s): 139-158
Keywords: cooling towers; concrete construction; reinforced concrete;
specifications; stresses; structural design; tolerances
reinforcing steels; shells(structural forms).
Abstract:Following the recent collapse of a cooling tower shell in Great Britain, believed to have been primarily due to the combined effects of geometric imperfections and vertical cracks, the design implications of geometric imperfections in the meridional profiles of cooling towers are reassessed. It is suggested that present and proposed tolerance recommendations are not sufficiently linked to the specific nature of the shell and its reinforcement, and if followed could result in serious overstressing. On the basis of a simplified approach to the analysis of a geometrically imperfect shell, tentative, code oriented, and rational tolerance specifications are presented. While retaining simplicity these recommendations do allow the tolerances to be related to the specific conditions which apply at any position of the "as designed" tower, and enable the complete specification of meridional tolerances prior to the commencement of construction.
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