New Data On The Ultimate Strength Of Tubular Welded K Joints Under Moment Loads

Siu Yung Alan Ma, I.E. Tebbett

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    A joint industry testing programme on the static strength of welded tubular joints is now completed. Tests on large scale steel models were carried out for a number of joint types and load cases for which little m no data are available to support current design criteria.

    This paper presents the test results of ten specimens of K configuration. Six K joints were tested under in-plane moment loading; for three specimens both braces were loaded in the same direction and for remaining three specimens the individual braces were loaded in opposite directions. The other five specimens were tested under out-of-plane loading with all braces loaded in the same direction. Other parameters embodied in the tests were ß ratio (ratio of brace to chord diameters) and ? ratio (ratio of gap between braces to chord diameter). The in-plane moment loaded tests on six K joints undertaken showed that stress field interaction developed in the gap region between braces is generally detrimental. The use of existing formulae for T/Y joints would underestimate the strength of K joints under in-plane moment loads. The results of out-of-plane moment loaded K joints indicate that current design approaches will yield adequate solutions. Comments are given on the suitability of the existing recommendations as given in API RP2A Specification and UEG publication which forms the basis of the new draft guidance on static strength recently issued by the UK Department of Energy.
    Original languageEnglish
    Title of host publicationOffshore Technology Conference, Houston, Texas,
    Place of PublicationHouston, Texas, USA.
    Publication statusPublished (VoR) - 2 May 1988


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