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The introduction of new automatic welding plants, which can deal with sections up to 3.8 m deep and weights up to 50 t, happens to coincide with the completion of work on methods of producing optimum design for welded plate girders. The paper describes the operation of the plant and the methods available for obtaining optimum designs.
A Code of Practice for bridges (BS 5400) is currently being written, and those parts of the Code that relate to concrete bridges have been published. The purpose of this paper is to give the background to the Code clauses that are concerned with crack control in concrete bridges. Particular emphasis is given to certain clauses that do not appear in the current building Code because they are concerned with structural forms or stress situations that occur in bridges but not in buildings, e.g. reinforcement not perpendicular to cracks, and deep voided slabs. Where appropriate, the Code clauses and their implications are compared with present bridge design practice.
L.A. Clark and G. Elliott
Everyone is entitled to be, and generally is, incensed when misquoted; Mr Beal is admirably restrained in drawing attention to our carelessness. He writes: An error seems to have crept into my letter on limit-state design as it appeared in print (February 1980). Towards the end of the third paragraph, it reads, ‘Assuming no one wishes to build a structure composed solely of either dead load or secondary dead load’ . . ., which might seem a slightly odd statement. It should have read, ‘Assuming no one wishes to build a structure composed solely of either live load or secondary
dead load, . . .’