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The effects of creep in reinforced concrete structures are briefly reviewed. In most structural units, creep alters the internal stress distribution and increases deflection but has little effect on ultimate strength.
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
Mr. J. E. C. Farebrother (F) : I have been asked to open this discussion in my capacity as Chairman of the Steering Committee of the LUCID organization. Len Jones has thanked almost everybody except himself and I would like to do that on behalf of the LUCID members.