The Structural Engineer > Archive > Volume 52 (1974) > Issues > Issue 9 > Discussion on Prestressing Steels by K.W. Longbottom and G.P. Mallett
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Discussion on Prestressing Steels by K.W. Longbottom and G.P. Mallett

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