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Precast beams acting compositely with in situ concrete deckslabs are a popular form of bridge construction. In the last 40 years, the use of this form has been extended to constructing multispan bridges on a span-by-span basis with movement joints at each support. Such joints have not performed satisfactorily because the penetration of road salts through them causes corrosion damage in these constricted areas of the bridge. Several methods of eliminating such joints have been evolved during the last 30 years; these are briefly described here. The deckslab continuity method, evolved by the author; is then presented. Its concept, design and applications are described with a view to engineers extracting maximum advantage from this powequl, yet simple, method of achieving continuity in multispan bridges. It is also shown that this method generally results in large economies as compared with the other methods and some savings even as compared with the undesirable 'jointed' span-by-span construction.
When completed in 1999, Guildhall East will consist of four office levels and three basements. The two lower basements will provide art and manuscript storage, while the upper basement, containing the remains of a recently discovered Roman amphitheatre will be fitted out as a museum.
No-one concerned with the building and design process can afford to be complacent about corrosion problems in steel-framed buildings. This is one of the conclusions of the long-awaited best practice guidance on Prevention and repair of corrosion in steel-framed structures, launched at a seminar in London recently.