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The problems of interaction between manmade structures and the ground which nature provides to support them are always with us; we were glad that the Institution's Symposium in May to launch its excellent state-of-the-art report was so well attended. Discussion was lively and interesting; Sam Thorburn and his committee are to be commended for producing a stimulating and useful study.
The subject of this paper is of great current interest to bridge
engineers and I should like to add a few comments.
By separating a vibration problem into two distinct parts, one concerned only with the spring forces in the structure and the other only with the inertial forces imposed by the mass carried, easy calculations can be used to solve fairly complex structures.