Author: Lightfoot, E;Michael, Duncan
First published: N/A
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Lightfoot, E;Michael, Duncan
The loading and structural behaviour of ships are described in general terms and an account is given of some of the contributions to structural knowledge which have emanated from shipbuilding sources. Design policy is discussed and it is noted that the design rules of the classification societies, which are based primarily on experience rather than on explicit factors against limiting conditions, lead to structures which are economical and safe. The classification societies (the largest of which is Lloyds Register) retain responsibility for the ship’s structure throughout its life; the experience on which the rules are based is therefore extensive and well co-ordinated.
The paper presents a numerical technique based on improved finite differencc formulae of the Hermitian type, for the analysis of structures taking into account the second-order effects of the displacements of the structure. The same method can be extended
to evaluate the critical loads of structures. The method, which is quite general, does not make use of previously tabulated data and can also include non-linear effects in the analysis. It can be applied to the second-order analysis of most plane structures
including continuous beam-columns, multi-storeyed rigid frames and arches. The author has illustrated the approach with several applications.
The design of submerged tunnels is a very wide subject and this paper, therefore, gives only an outline of the problems encountered.