Extradosed bridges and the application of Eurocode

Da Silva Escobar, Yenniffer (2014) Extradosed bridges and the application of Eurocode. BEng dissertation, University of Portsmouth.

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    Abstract

    The extradosed prestressed bridge concept is a relatively new type of structure regarded as a combination between prestress girder and cable-stayed bridge. In this type of structure the prestressing tendons are deviated outside the deck at the section over the piers imitating the shape of the bending moment diagram; this arrangement has proven to greatly improve the system efficiency allowing for ease of detailing and savings in materials usage. Despite the increasing popularity of the extradosed bridge and a number of them already been constructed particularly in Asia, this technology has not been widely adopted in Europe mainly due to the lack of design standards.
    The purpose of this work is to explore the criteria Eurocode applies to the design of the extradosed structures in order to evaluate their feasibility. A standard proportions extradosed bridge model is assumed and the main structural differences it presents from girder and cable-stayed bridges are outlined; in addition the bridge is analysed by means of a simplified line beam analysis and the relevant sections of Eurocode are related.
    The extradosed bridges constructed to date have demonstrated to be cost-effective, efficient and aesthetical appealing structures for the range of medium spans. Nevertheless Eurocodes do not specify criteria for the design of ‘extradosed cables’ or external unbonded tendons. A revision on the design criteria for steel tension components by the Eurocode Committee is recommended.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 16 Jan 2015 15:00
    Last Modified: 28 Jan 2015 12:47
    URI: http://eprints.port.ac.uk/id/eprint/16444

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