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There have been many situations in which flexural members - especially bridge girders -have been found to have less than the desired strength. A widely used method of providing additional strength has been the introduction of prestressing by means of external tendons'. External tendons are prestressing strands situated outside the original concrete section and are connected to the structure by anchorages and deviators. B.J. Sun
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.
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