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The CHAIRMAN, introducing the author, recalled that the paper was a description of one of our major national schemes of post-war reconstruction which had formed the subject of a very pleasurable visit by the Scottish Branch last year when the previous President was able to visit the works.
Sir, In this paper, Mr. Robson considers the effect on bending moments when the change of moment of inertia along a continuous reinforced concrete beam is taken into account. Changes are assumed to occur where the bending moment changes sign, and the calculations are based on the ratio of the moment of inertia of a plain concrete tee beam for sagging moment, and a rectangular beam for hogging moment.
Before dealing with the main substance of this subject there are certain factors which should be appreciated in order to obtain a true picture of the many variables which confront the structural engineer in work associated with the gas industry. W.R. Garrett