Correspondence on Grillage Analysis Applied to Cellular Bridge Decks by E.C. Hambly and E. Pennells

The duties and responsibilities associated with Building Regulations continue to stimulate what is, we are sure, a most useful and interesting discussion. Mr. F. D. Entwisle added to his succinct contribution (October 75) a further commentary stimulated by the observation of Mr. R. E. Musson and ourselves: I would like to comment on Mr. R. E. Musson's contribution and the last paragraph of your observations (October 75). Verulam

Effects of geometric imperfections in the form of the meridians of hyperboloidal cooling towers are re-assessed. It is shown that even moderate imperfections induce hoop stresses in the vicinity of the imperfection that are of the same order of magnitude as the meridional stresses that would occur in this same area of the perfect shell. K.O. Kemp and J.G.A. Croll

The Cruachan Viaduct, carrying the Tyndrum-Oban trunk road A85 along the north shore of Loch Awe, was strengthened during the 1930s, but became inadequate for present-day traffic and a further major construction has recently been completed. E.H. Cooley