Author: Davies, W H;Gray, B A;West, F E S
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Davies, W H;Gray, B A;West, F E S
The reservations that Professor Heyman expresses regarding the relationship of loads assumed in simple plastic design to real states of loading have some justification, particularly in view of the dubious nature of stochastic calculations in relation to extreme loading conditions. I find it, however, more difficult to follow his arguments in relation to deflexions and stability calculations.
Professor M.R. Horne
For nearly thirty years, including seven years of war-time, I had no contact with the Institution headquarters except by post and through reading-or trying to read-the journal. In early days I knew only one name: Major Maitland, and I wondered but never understood what went on at 'headquarters'. How did 'they' decide whether or not I was to achieve my ambition to become a fully-fledged structural engineer? One realized that Major Maitland did not do all the work himself and that even given a President, elected yearly, the two of them must have a large body of assistance, both from the members themselves and from some sort of secretariat, to handle all the business-not fully understood by me of a major professional institution.
Peter S. Rhodes
An experimental investigation on reinforced concrete beams undertaken to determine the influence of fluctuation of loading on deflexions is described. The beams were subjected to a range of loading regimes usually with a fluctuating component. A linear logarithmic relationship was found between the increase in maximum deflexion and the
number of fluctuations or the length of time under load. Increases in deflexion of beams under fluctuating loads were about the same as for beams subjected to sustained load equal in magnitude to the maximum of the fluctuation. The results are related to present design criteria and methods of analysis for deflexions of reinforced concrete structures and the implications for design are discussed.
P.R. Sparks and J.B. Menzies