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The application of electric arc welding to the fabrication of steel bridge girders and building frames has resulted naturally in the increased use of the “continuous” or “rigid frame” type of structure. Typical of this form of construction are the portal frame and Vierendeel girders, for both of which satisfactory methods of computing the member moments, loads and shears have been evolved. An examination of the
literature, however, shows that reliable methods of designing the joints between the members of these structures are less well known and that there is some doubt as to the degree of accuracy with which the stresses in the joints can be estimated by such formulae as have been put forward.
Arnold William Hendry
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.