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The Structural Engineer

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. A.L.L. Baker

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Author – Baker, A L L

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The Structural Engineer

Mr. F.H. Needham (Member of Council) said he was particularly interested in the reference to the use of Delta bronze for reinforcement. This was most unusual, but the speaker had had occasion to do the same four years previously. The advisability of using it had been weighed up very carefully indeed. It had three principal snags: first, the very high cost-l0 times that of mild steel; second, low value of E, which affected calculations quite considerably; third, the fact that it could not be bent cold. On the latter point they had followed the advice given by the makers; it had been suggested that marginal cracks would appear on the outside if it were bent to too small a radius.

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The Structural Engineer

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

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Author – Fairhurst, W A;Beveridge, A

Price – £9