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A definition of structuralstability is given in terms of the sensitivity of structures to variations of the design parameters. The problem of overall stability is then considered, as distinct from localmember stability, and two main modes of overall instability are identified, namely lateral and torsionalinstability. Each of these modes of overall instability are then examined in terms of some of the main factors involved, particularly the variability of live loads, stiffness and geometry, and the influence of geometrical changes during live loading and differential settlements. Statistical methods have been used where appropriate.
David J. Dowrick
Introduction by Dr. Taylor: Four years ago, to this month, a paper of which I was a joint author (with Dr. Somerville) entitled 'The influence of detailing on the strength of reinforced concrete structures' was presented to this Institution. At the close of that paper, Mr. Geddes, then President, suggested that the Institution would like to hear more of our continuing research on detailing. Although this paper treats some more detailing problems in much the same way as before (and in one case presents more information on a subject discussed before) our approach to detailing problems has been extended. The basic message from our previous paper was that the normal Code rules for detailing (bond, bearing etc.) are not necessarily sufficient when considering the detailing of critical parts of concrete structures, in particular at intersections between elements. In the cases mentioned in the last paper it was suggested that, providing internal statically determinate truss systems could be envisaged and steel was provided to carry the tension, with concrete carrying the compression, the resulting details would have a good chance of working safely.
The paper provides the designer of precast concrete buildings with a valuable design aid. To enable general design rules to be established within the context of current design practice it would be of great assistance if the authors could offer some
advice concerning the following: