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Professor A.L.L. Baker, who represents the Institution of Structural Engineers, Institution of Civil Engineers, Reinforced Concrete Association and Cement and Concrete Association on the European Concrete Committee (CEB), reports on a meeting
of the Committee held in Ankara last September.
The paper describes the design, fabrication and erection of the welded steel box girders and concrete deck slab which form the composite superstructure of the bridge. The reasons for the various design features are stated. Mention is made of the use of
models for the design stage and the results of a quarter-size model test to destruction are given. The welding procedure is outlined and the method of erection of the girders is explained. The routine tests carried out to check the quality of materials and workmanship are enumerated. Various features of the superstructure are then described and the paper concludes with an indication of possible developments in composite design.
W.A. Fairhurst and A. Beveridge
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