To continue the introduction to steel and composite bridges. To describe footbridges, moving bridges, and service bridges. To provide initial guidance in the selection of bridge form and span.
SUMMARY
This lecture describes three types of special bridges, highlighting some of the features in design. Footbridges are narrow, lightly loaded structures frequently in visually sensitive locations. Moving bridges are subject to particular constraints of geometry and mass. Services bridges offer special opportunities for innovative design. The lecture concludes with some guidance on the appropriate selection of bridge form and on the determination of optimum spans for viaducts.
In the lecture The design of steel and composite bridges: part 1, attention was concentrated both on the principal design parameters and the various structural forms that a designer may consider when carrying out the preliminary or conceptual design of a bridge. It is probably safe to say that the large majority of bridges are fixed structures carrying a road or railway, and it is easy to see how the types discussed can be used for such bridges. In this second part, attention will first be given to particular considerations affecting some special types of bridge. Three types will be discussed - footbridges, moving bridges, and service bridges (pipelines, etc.). Some guidance on choice of bridge type and span is also provided.
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