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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
There are environmental, technical and commercial reasons why the increased use of lightweight aggregate for concrete should be encouraged in this country. In this paper,
arguments in favour of and factors acting against the more general use of the material are examined and it is suggested that a major stumbling block is confusion between straight forward lightweight aggregate concrete suitable for most normal construction and the more exotic materials requiredfor highly specialised applications. The author
proposes a new category of lightweight concrete for those mixes that behave like normal dense concrete and argues that they should be exempt from the special restrictions imposed by current Codes of Practice on reinforced lightweight
concrete. Examples of the use of both types of lightweight concrete are given together with summaries of cost studies and cost evaluations.
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).