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THE PRESIDENT (Dr. Oscar Faber, O.B.E., M.Inst.C.E.) proposed a hearty vote of thanks to Dr. Evans for his magnificent paper. It contained, he said, a wealth of material, which might be dealt with adequately if it were spread over six lectures and if about twenty meetings were devoted to its discussion. Mr. GOWER B.R. Pimm, M.Inst.C.E. (Member of Council), endorsed the President’s tribute to the excellence of the paper, but admitted that considerable study was necessary in order to digest its contents.
1. The various analytical methods for determining the stresses in a continuous framework all start from the same assumptions and lead to the same conclusions, the intermediate processes being relatively long or short according to the characteristics of the particu1ar problem involved. The Author has indicated elsewhere the derivation of special methods from the principle of least work (R. l), and has shown that where it can be applied directly the method of analysis by the principle of least work gives results more readily and more simply than is possible by the application of special methods (R. 2,3). In this paper the method of least work is extended to cover all types of frameworks.
TESTS made on structures for the purpose of obtaining new or confirmatory information can be divided into three main groups:-
I. Those dealing with the strength, durability and mechanical properties of materials and construction. Tests of the chemical composition of materials are the work of the analytical chemist and not the structural engineer, although the latter is, of course, interested in the chemical composition in so far as it affects strength and durability.
II. Tests of foundations and incidentally of the properties of the media by which the substructures are supported.
III. Tests of the mechanical and static properties and strength of projected or completed superstructures.