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    Flexural behaviour of asymmetric composite beam with low degree of shear connection

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    Publication date
    2018-02
    Author
    Sheehan, Therese
    Dai, Xianghe
    Lam, Dennis
    Keyword
    Composite beams; Shear connection; Unpropped construction; Eurocode 4
    Peer-Reviewed
    Yes
    
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    Abstract
    This paper outlines an experiment on a 12 m long composite beam subjected to uniformly distributed loading. Although composite beams are widely used, current Eurocode design guidelines for these types of members can be over-conservative, particularly in relation to the required degree of shear connection. The tested beam comprised a concrete slab supported by profiled metal decking, connected to an asymmetric fabricated steel I-beam using welded shear studs. The specimen was assembled using unpropped construction methods and had a degree of shear connection equal to 33%, significantly lower than the minimum required amount specified in Eurocode 4. A uniformly distributed load was applied to the specimen, which was increased until the failure occurred characterized by yielding of the steel beam. The maximum bending moment of the composite beam obtained from the test was close to the plastic bending resistance according to the Eurocode 4. No concrete crushing or shear stud failure was observed and the end slips exceeded 6 mm, the limit for ductile behaviour in Eurocode 4. The test demonstrated the merits of unpropped construction, which are currently not fully exploited in Eurocode 4. The comparison and analysis suggest that the design limits governing the minimum degree of shear connection might be revised.
    URI
    http://hdl.handle.net/10454/14048
    Version
    Accepted Manuscript
    Citation
    Sheehan T, Lam D and Dai X (2018) Flexural behaviour of asymmetric composite beam with low degree of shear connection. Journal of Constructional Steel Research. 141: 251-261.
    Link to publisher’s version
    https://doi.org/10.1016/j.jcsr.2017.11.018
    Type
    Article
    Collections
    Engineering and Informatics Publications

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