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A new general method is presented for analysing the distribution of concentrated loads in right orthotropic bridge decks. The analysis is compared with the Guyon-Massonnet analysis within the limited range of the latter and is found to give significantly higher values of longitudinal moment. Good correlation is found with experimental values on slabs obtained by Rowe and by the authors.
Professor A.R. Cusens and R.P. Pama
Mr. S. Butler: ‘Having read the paper before I came to this meeting, and from past acquaintance with the aeroplane, I should first like to make a statement and then put a question. I was interested in the mention of seven per cent of take-off weight for the pay load; in fact in the paper it says “Only seven per cent”. This was rather more creditable than one tends to think. For a railway train, thought of as a transport vehicle, I believe it is one per cent, if not appreciably less. I think the optimum in percentage pay load goes to a mini car with four hefty men and luggage, and that makes about thirty to thirty-five per cent.'
It is shown that an examination of the deformation of a free cable suggests an array of diagonal stays or braces as a means of reducing the deflections. The braces prestress the cable which, since it behaves nonlinearly, produces an increase in the stiffness. Bracing is similar to gravity loading in that it increases the vertical forces acting on the cable. The increased stiffness is thus analogous to gravity stiffness. A theory is presented for analysing this type of structure, and a numerical method of solving the governing equations is given. An experimental investigation verifying the theory is included and finally a theoretical discussion of the significance of the main parameters is given.
T.J. Poskitt and P.R. Stott