Design Guide for Composite Highway Bridges


Design Guide for Composite Highway Bridges

Design Guide for Composite Highway Bridges is an amalgamation of guidance and example

calculations previously given in two separate Steel Construction Institute publications. Both
publications prepared by Mr D.C.Iles of the Steel Construction Institute, with advice from
members of the Steel Bridge Group.
The Steel Construction Institute expresses thanks to Messrs Bullen and Partners, the
Travers Morgan Group and Cass Hayward and Partners, for permission to use the designs
shown in the worked examples. Thanks are also expressed to Mr C.R. Hendry (W.S.Atkins)
and Miss N.Knudsen (SCI) for carrying out checks on the worked examples.
The work leading to this publication was funded by Corus (formerly British Steel).

Composite construction, using a reinforced concrete slab on top of steel girders, is an
economical and popular form of construction for highway bridges. It can be used over a wide
range of span sizes.
Design Guide for Composite Highway Bridges covers the design of continuous composite
bridges, with both compact and non-compact sections, and simply supported composite
bridges of the ‘slab-on-beam’ form of construction.
The guide assumes that the reader is familiar with the general principles of limit state
design and has some knowledge of structural steelwork. It provides advice on the general
considerations for design, advice on the initial design process and detailed advice on the
verification of structural adequacy in accordance with BS 5400. It concludes some advice on
structural detailing. The determination of design forces throughout the slab is described, key
features relating to slab design are identified, and detailed advice on slab design is given. The
selection of protective treatment and bearings is excluded, being well covered in other

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