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The Structural Engineer, Volume 65, Issue 7, 1987
BS5400 is a limit state Code, but it still specifies maximum Stresses under service load. This amounts to specifuing maximum allowable working stresses. The need for this restriction has been questioned on the grounds that stresses are not fundamental design criteria. The limits do, however, serve a useful function within the Code. The new revision to the Code allows the stress check to be avoided, provided certain rules are complied with. These rules have a logical bask and produce designs for simple beams which do not depart significantly from the stress limits themselves. One effect of the stress limits that has not been widely appreciated is that they produce a severe restriction on the economic advantage that can be obtained from the use of inelastic analysis at the ultimate limit state. This is because the service stresses, rather than ultimate strength, are critical in design, a fact that should be reflected in the attention that design service loads receive when loading is reviewed. P.A. Jackson
The following is the text of the address given by the President, Professor Happold, at celebrations to mark the centenary of the Canadian Society for Civil Engineering held in Montreal in May. The commemorative medal presented to the Society was illustrated in last month’s issue of The Structural Engineer (p221). It is said that, when the first French settlers sailed up the St. Lawrence River, they were so appalled by the wildness of the country they saw that they wrote across the map ’Acanada’-here is nothing. Yet, we have come to learn that this nation has great resources and its development by man was- and is - inevitable.
Mr H. B. Gould (F) G. Maunsell & Partners): It has been a great privilege to hear the authors of three such interesting papers present them so interestingly. The fields they cover have such wide implications that it is difficult to know not so much where to ask questions but where to finish. I will limit myself, therefore, to one or two addressed to the authors of each of the papers.