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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.'
Mr. M. H. Rees: 'This is an extremely interesting structure and I have really just three questions out of the very numerous thoughts that have occurred to me, mostly concerned with the staging of prestressing and the adjustment of arch thrust on decentering. Both of these go to make tools invaluable to the designer in making large span concrete structures economic.'
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