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The construction industry has undergone heavy criticism and self analysis over the last few years. Two studies, one by NEDO and the other by Slough Estates Limited were of particular interest, not least, because they were specific. Both found that from conception to execution of the building, the industry compares poorly with those of other countries. Another investigation carried out by the Building and Engineering
EDC's-'The professions in the construction industries' was primarily based on interviews and contains many opinions on shortcomings3and suggests many themes for
The fairly long discussion which has taken place on trussed rafters, connector plates
and associated aspects has brought a fairly vigorous response from Mr. H. J. Andrews in their defence. He writes: I feel the time has come to respond to some of the absurdities that are being quoted in your column 'Queries, Comments, Correspondence and Curiosities' in connection with trussed rafters, and more recently the addition
of joist hangers (Sept. 1977).
The theoretical background to the design of welded plate girders according to BS449 is adopted in a search for optimum design. Within certain practical limitations, design curves are derived for minimum weight design. A computer-based design system is described from which minimum cost designs can be produced for conventional plate girders and welded crane girders. Some observations derived from computer results are
given which, together with the design curves, provide guidelines to wards obtaining an optimum design.
G.C. de Jesus and A. Burns