Elastic cross-section analysis of continuous composite beams affected by web slenderness

Paul Berry, S. L. Chan, J. G. Teng, K. F. Chung

    Research output: Chapter in Book / Conference PaperConference Paper

    Abstract

    ![CDATA[Continuous composite beams offer significant benefits over simply-supported composite beams: the load carrying capacity of otherwise identical beams is increased by 15–40% and the deflections are reduced by 60–70%. However, the presence of tensile reinforcement in the concrete slab of negative moment regions may cause an otherwise non-compact web to be affected by local buckling. The Australian Standard AS 2327.1 on simply supported composite beams covers the analysis of cross-sections in positive bending, but there are currently no rules for designing cross-sections of continuous composite beams in negative bending. This paper presents a method for the elastic analysis of cross-sections in negative bending, which eliminates the previous need for iterative solutions. It is based on the calculation of key levels of reinforcement that define the transition between different effective cross-sections. The method extends the 'hole in the web' approach used by AS 2327.1 and the European Standard Eurocode4 for the plastic cross-section analysis of non-compact webs (EC4 Class 3) to cover the elastic cross-section analysis of slender webs (EC4 Class 4). The method is most applicable to welded beams, which are common in bridge construction and generally more slender than hot-rolled sections. The paper shows that whereas the use of a longitudinal web stiffener provides only minimal benefit, the use of an additional bottom flange plate extending for a short distance over the support can lead to substantial strength gains.]]
    Original languageEnglish
    Title of host publicationAdvances in Steel Structures: Proceedings of the Third International Conference on Advances in Steel Structures, 9-11 December 2002, Hong Kong, China
    PublisherElsevier
    Number of pages8
    ISBN (Print)0080440177
    Publication statusPublished - 2002
    EventInternational Conference on Advances in Steel Structures -
    Duration: 14 Apr 2012 → …

    Conference

    ConferenceInternational Conference on Advances in Steel Structures
    Period14/04/12 → …

    Keywords

    • composite construction
    • composite beams
    • concrete slabs
    • elastic analysis (engineering)
    • buckling (mechanics)
    • bridges

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