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A Joint Meeting with the British Section of the Societe des Ingenieurs Civils de France was held at 11 Upper Belgrave Street, London, S.W.1,on Thursday, 30th May, 1946, at 6 p.m. The Chair was taken by Mr. Conrad Gribble, O.B.E., M.I.C.E., President of the British Section, who was supported by the President of the Institution, Prof. H. J. Collins.
THE PRESIDENT (Mr. F.E. Drury, M.Sc., M.I.Struct.E.) said that no doubt the members knew something about the strength of aluminium structures, but they did not know a great deal, perhaps, about aluminium and its alloys. The paper gave them an opportunity, therefore, to broaden their minds on this subject, especially from a metallurgical point of view.
Whilst it has been accepted since the days of Considere's work at the beginning of the century, that a helical form of lateral reinforcement increased the strength of a reinforced concrete column, so far as the Author is aware, it has never been claimed that the ordinary hoop form of binder gives any material contribution to the ultimate strength of the column. This Paper, amongst other points, submits the results of tests to destruction of nearly 200 small columns, and indicates quite definitely that the normal binders, if placed at a sufficiently small pitch, can contribute considerably to the load carrying capacity. It also questions the currently accepted practice of ascribing the helical binder effect to its function in restraining the lateral expansion of the concrete.
Jeffrey William Hitchen King