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The reservations that Professor Heyman expresses regarding the relationship of loads assumed in simple plastic design to real states of loading have some justification, particularly in view of the dubious nature of stochastic calculations in relation to extreme loading conditions. I find it, however, more difficult to follow his arguments in relation to deflexions and stability calculations.
Professor M.R. Horne
The history of the Fort Regent from its origins to the present day are first described followed by the requirements of the States of Jersey and the evolution of the design now under construction. The engineering problems encountered and the derivation of design loadings together with the solutions to these problems and the design logic employed are discussed. The various structural elements that form the complete roof structure, such as the curved roof beams, fascia girders, portal frames, and the north and south ends and the dome, are fully described together with the design procedure for the structural elements and the methods of shop and site fabrication.
W.H. davies, B.A. Gray and F.E.S. West
Beams of varying depth are widely used in civil engineering structures, and are particularly suitable for large span prestressed concrete bridges. It is well known that the distribution of shear stress and hence principal tensile stress may be considerably affected by the variation in depth. A review is made of the various elastic analytical methods available, and their assumptions are discussed. The accuracy of each analysis is assessed on a plane wedge under separate application of normal force, shear, and bending moment, for a range of slopes and curvatures. The effect of curvature is shown to be unimportant for the values associated with bridges. The approximate forms of the solutions reached by Boussinesq and Wysiatycki are shown to be identical. These expressions are simple and give good agreement with the exact solution. Photo-elastic and finite element models are used to examine the accuracy of the various analytical methods applied to box-sections.
Gwynnes Davies, Richard S. Lamb and Cyril Snell