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Dr P. A. Jackson (F) (Gifford & Partners) Having been responsible for the assessment, testing and analysis of a number of similar bridges, I was very interested in this paper. I have a few comments and would like to hear the authors’ views.
A happy New Year to you all! The Christmas holiday has proved inspirational to a number qf readers... Deflection of portals Mr D. H. Camilleri has written from Malta and is concerned about the vertical deflection of portal frames. He writes: I have often wondered regarding the validity of the ridge deflection dRE quoted in section 11.5 of Manual for the design of steelwork building structures given as: dRE = dE X cot e, where dE is the horizontal deflection.
This paper considers where over-design may exist in current engineering practice and, in particulal; traces the history of imposed load allowances and the relevance of current values, as designated in the current British Standard, to today’s commercial ofice buildings. Independent research into actual loading conditions is considered and compared with the normally adopted values of imposed loads. Anomalies with other western European countries are noted, and areas where a review of the current relevant British Standards may be appropriate are identfied. J.A. Austin