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Mr. Brian Scruby (Chairman): ‘ A point that occurred to me when reading your paper was that when I went to America a few years ago I saw some buildings which I thought were rather typical of the industrial side of American building and which seemed to be designed for a specific period of time. I wonder if you would say something about durability and its particular reference to the time factor? '
Mr. K. F. Simm (of Freeman Fox & Partners) writes: ' The computer program described by the author greatly simplifies the analysis of reinforced concrete columns subject to bi-axial bending. It has been used in my office for some time and the data preparation is very much easier than the laborious hand calculation involved in Saville's method. '
At present, the requirements for structural concrete are specified in five different Codes of Practice. These Codes have been drafted at different times and it is not surprising that they differ considerably in those sections related to the specification and production of the concrete. This paper describes the development of the requirements for concrete in the Codes from 1934 to 1965. D.C. Teychenne