The behaviour of T-end connections To Circular Hollow Sections (CHS)

  • Abdussamad Wnis

    Student thesis: Doctoral ThesisDoctor of Philosophy

    Abstract

    Welded T-end connections for structural hollow sections (SHS) are one of the simplest and cheapest to fabricate. However, at present there is little understanding of the design guidance available especially for such connections to circular hollow sections. Work has mainly been conducted in Australia and is limited in scope and no guidance currently exist in the UK

    Several design approaches exist, but none seem to be able to predict the thickness of end (cap) plate required to carry the full tension capacity of the hollow section. The thickness of the cap plate is thought to be a major factor in determining the capacity of the connection. Other factors which may affect the behaviour of the connection are the weld size, the thickness, and breath of the CHS member

    This project is primarily concerned with investigating and understanding the fundamental behaviour of welded T-end connections to circular hollow section (CHS) members subjected to axial tension. A total of 22 specimens were tested to failure. Parameters considered for the investigation were the tube size and the cap plate thickness. The cleat plate thickness was kept constant for all tests. Finite element (FE) models are to be developed to compare with experimental results. The yield line method, based on failure mechanism models developed elsewhere, was also use to predict the failure load of the specimens. The results obtained from the tests, the finite element analysis, and the yield line analysis are compared and discussed. An attempt is made to suggest design guidelines for such connection based on the findings of the current research.
    The test results revealed that the use of thick cap plate (more 12.5mm) does not necessarily lead to increased joint capacity. There was also evidence of shear lag effects taking place as none of the specimens reached its full tensile strength.
    Date of AwardJul 2007
    Original languageEnglish
    Awarding Institution
    • Coventry University
    SupervisorMessaoud Saidani (Supervisor)

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