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Towards a unified stress grading for timber
It is hoped that this correspondence on the above title will cover most of the interesting points raised by Mr. J. K. Sykes (M) in the Verulam column, June 1976, page 233.
Dr. D.N. Nwokoye
Professor Bolton gives an exposition of the stability of frames that may well commend itself to engineers seeking an elementary understanding of the phenomenon. Precisely for this reason it is a misleading and even potentially dangerous paper. Although far from the intention of the author, it in fact conveys the impression that frame stability is a local phenomenon, calculable from the stiffness of a single symmetrical joint in a 'no-shear' frame on the assumption that the remote ends of the columns are direction-fixed. To attempt to derive the sway stability of a frame by considering one joint is just as inadequate as the procedure common in Codes, and criticised by Bolton, of merely dealing with crudely calculated effective lengths of single members. By contrast, in discussing our approximate methods, Wood and the contributor both give
explicit recognition to the fact that sway stability is an overall frame behaviour problem, thereby deriving more consistent results for derived critical loads.
M.R. Horne, R.H. Wood and J.W. Bunce
The President: Good evening, ladies and gentlemen, and welcome to this rather special meeting, which is a combined one with the the British Group of International Association for Bridge and Structural Engineering. As well as welcoming all those of you in the body of the hall, we have a number of special guests that I would mention. First and foremost, Professor Leonhardt and Frau Leonhardt, and of course of Professor Leonhardt more later. We have Baroness Sharp, Dr. and Mrs. Feilden, Sir Hugh Wilson, Sir Charles Husband, Mr. Philip Gooding, and Professor Baker.