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The authors have presented an interesting method for the rapid estimation of maximum bending moments in decks of suspension bridges. Their approximate analysis draws to a
logical conclusion the more general method described by Bowen and Charlton (reference 3 of the paper). It is clear that the use of symmetry and antisymmetry offers a considerable computational advantage :two sets of three linear simultaneous equations are solved far more quickly than one set of six.
F. Van der Woude, M.S. Gregory and H.I.A. Hegab
The energy required to make, transport and erect the most common structural materials is tabulated, together with the energy to make unit areas of several building elements. An energy audit is carried out for 12 different layouts of basic structure including reinforced concrete, structural steel and loadbearing brickwork. Similar calculations for ll elevations of cladding suitable for use with the selected structures are also given. Where appropriate, the results for different elevations and structures are combined to give figures for total structure. To avoid the possibility of misleading conclusions. similar results are presented for the running energy required for the elevations considered. Conclusions are drawn concerning the lowest amount of energy required to build internal structures, elevations, and total structures.
Mr. P. B. Ronan: I would like to ask the authors if in retrospect they felt that the site investigation, in particular for a building of this magnitude, was adequate with particular reference to the two boreholes which were put down to give information about groundwater?