Author: Rhodes, Peter S
First published: N/A
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Rhodes, Peter S
Good approximations to engineering problems are, if anything, more important than lengthy rigorous solutions. This is particularly true in the dynamic analysis of structures since dynamic stability does not usually enter the design of a structure but will only be taken into consideration with regard to the safety of the established
Mr. S.T. Jones: 'At a meeting of professional structural engineers my view of this particular work is from a rather different angle from that of anyone else in the hall; it is from the rather unusual position of a highway operator.'
With the growing importance of the light, metallic, reficulated dome as a structural form, the need for improved stability criteria is emphasized. For elastic, single-layer
dome frameworks of the regular triangulated, reticular type an analysis is made of both local buckling and local snap-through instability. The critical constants are found to be functions of a single geometric characteristic parameter of the dome that corresponds to the effective slenderness ratio for columns. The buckling analysis can
be generalized to cover the inelastic range by use of the tangent modulus, but it is shown that this bifurcation buckling load is of limited usefulness as an index for
predicting structural behaviour. An improved criterion of local stability is given in a form suitable for design use, subject to experimental verification.