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Mr. B. Rhodes: Mr. Longbottom has done less than justice to large diameter strand, by which I mean 28 mm (1 1/8 in) diameter strand. I know it is not used a lot, but this is really because of lack of effort on the part of the manufacturers and the system suppliers. 28 mm diameter strand has certain basic drawbacks, namely:
1. The shape of the load/extension curve
2. Relaxation losses at 6 per cent
3. Lower grip efficiencies
4. The tendency to fly open when cut
5. The 'banana' effect at the ends
Professor S. Mackey (F) : My main concern is to learn why, in Britain, limited records of wind and pressure measurements are being extrapolated to such a degree that if applied to Hong Kong conditions would render economic design of buildings impossible.
On 20 July last, under ref. BRA/1068/2, the DOE addressed the letter given below to local authorities, new town development corporations, etc. The letter contains an assessment of the BRE Report on the failure of roof beams at Sir John Cass's Foundation and Red Coat Church of England Secondary School, Stepney, and sets out a programme of action for inspection and assessment. Attached to the letter was an annex 'Suggestions for testing high alumina cement concrete' which is published on page 326.