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This project involved an investigation into the behaviour of the negative moment regions of continuous composite bridges. It aimed to produce numerical and experimental evidence to determine the behaviour of the negative moment regions and to provide a basis for more efficiency and competitive design rules. Practical composite steel/concrete bridge details for negative moment regions are given in the results of a survey of practising bridge designers. Existing design methods for the behaviour of the regions are presented and compared. The results of four major tests which consider the true U-frame behaviour of steel/concrete composite girders for bridges and buildings are discussed and compared with existing design methods. The experimental work is closely correlated to numerical models developed to study the complex buckling behaviour of the negative moment regions. The project concludes that the existing design methods underestimate the load-carrying capacity of continuous composite girders of both compact and noncompact sections. This is due to the methods being based upon incorrect or limited structural models. Additonally, the important effect of discrete U-frame action in composite girders with stiffened webs is not adequately represented in any of the design methods.

Additional information

Authors: O'CONNOR M, The Steel Construction Institute, Ascot (GB);MARTIN D, The Steel Construction Institute, Ascot (GB)
Bibliographic Reference: EUR 15513 EN (1996) 295pp., FS, ECU 30
Availability: Available from the (2)
ISBN: ISBN 92-827-6192-4
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