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Internal ring-stiffeners do not significantly affect the ductility of tubular joints as stiffened joints reach their peak strengths at about the same deformation level as their unstiffened counterparts

Strength of ring-stiffened tubular T-joints in offshore structures—

JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, no. 3 (1999): 239.0-264

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摘要

Although not commonly used in modern design, ring-stiffeners were extensively used to enhance the strength of tubular joints found in older offshore steel jacket structures. No detailed guidance on the determination of strength of ring-stiffened joints can be found in any major offshore code. There is therefore a need for research for the...更多

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简介
  • Tubular joints in circular hollow sections are major structural components in offshore jacket structures.
  • None of the major offshore design codes, such as API [2] and HSE [3], provides any substantial quantitative recommendations on static strength requirements.
  • This is due partly to the vast variety of possible stiffening arrangements and partly to the dearth of information avail-
重点内容
  • Tubular joints in circular hollow sections are major structural components in offshore jacket structures
  • Guidance on strength estimation is still needed for the purposes of structural assessment of older platforms and it is estimated that there are at least 2000 ring-stiffened joints in the North Sea alone [1]
  • For the stiffened joint R-1-1, Table 2 shows that changing the number of rings of elements down the depth of the stiffener has no noticeable effect on strength
  • A database of some 40 stiffened joints has been generated from the numerical study
  • Internal ring-stiffeners do not significantly affect the ductility of tubular joints as stiffened joints reach their peak strengths at about the same deformation level as their unstiffened counterparts
  • The joint ratios ␤ and ␥ have a significant influence on the strength enhancement provided by the stiffeners
结果
  • Results of convergence and validation study

    The results of the convergence study for the unstiffened joint R-0-2, shown in Table 1, illustrate that convergence was more or less achieved with a mesh density of 1452 elements, as a significant increase in the number of elements to 1808, mesh R-0-2/5, which more than doubled the cpu time required for analysis, produced almost no change in strength.
  • The load–displacement history for each analysis, stiffened or unstiffened, was plotted and the strength of the joints, as well as the stiffeners, were determined from these plots.
结论
  • A database of some 40 stiffened joints has been generated from the numerical study.
  • The numerical procedure can provide accurate and valid strength predictions of both unstiffened and stiffened T-joints.
  • 3. The development of discrete plastic zones in the stiffeners suggests that they fail by the formation of plastic hinges from bending, rather than fail by shear yielding.
  • 4. The joint ratios ␤ and ␥ have a significant influence on the strength enhancement provided by the stiffeners
表格
  • Table1: Results of convergence study for unstiffened joint R-0-2
  • Table2: Results of convergence study for stiffened joint R-1-1
  • Table3: Results of validation study
  • Table4: Notation for stiffened joint reference
  • Table5: Details of joints/stiffeners for investigating the influence of tw and dw
  • Table6: Details of joints/stiffeners for investigating the influence of tf
  • Table7: Details of joints/stiffeners for investigating the influence of bf
  • Table8: Details of joint/stiffeners for investigation the influence of ␤
  • Table9: Details of joint/stiffeners for investigation the influence of ␥
  • Table10: Comparison of joints with single, double and triple stiffeners
Download tables as Excel
基金
  • Financial support from both the University of Wales Swansea and MSL Engineering are gratefully acknowledged
引用论文
  • Wimpey Offshore. In-service database for ring-stiffened tubular joints, Report WOL 035/91, 1991.
    Google ScholarFindings
  • American Petroleum Institute API-RP2A-LRFD: recommended practice for planning, designing and constructing fixed offshore platforms, 1st ed., 1993.
    Google ScholarFindings
  • Health and Safety Executive. Offshore installations: guidance on design, construction and certification, 3rd amendment to 4th ed., 1995.
    Google ScholarFindings
  • Lee MMK, Llewelyn-Parry A. A theoretical model for predicting the strength of ring-stiffened tubular T-joints in offshore structures. Struct. Bldgs Proc. Inst. Civil Eng. 1999;134:19–31.
    Google ScholarLocate open access versionFindings
  • Sawada Y, Idogaki S, Sketia K. Static and fatigue tests on T-joints stiffened by an internal ring. Offshore Technology Conference, 1979, Houston, USA, paper OTC 3422.
    Google ScholarFindings
  • Marshall PW. Design of welded tubular connections—basis and use of AWS code of provisions. Amsterdam: Elsevier, 1992.
    Google ScholarFindings
  • Akiyama, N., Yashima, M., Akiyama, H. and Otake, A. Report on tests conducted on the ultimate strength of steel tubular joints. Jap Soc Steel Construct (JSSC) 1979;10(102) (in Japanese).
    Google ScholarLocate open access versionFindings
  • Brandi R. Behaviour of unstiffened and stiffened tubular joints. Conference on Steel in Marine Structures, Paris, 1981, paper 6.1.
    Google ScholarFindings
  • Underwater Engineering Group (UEG). Design of tubular joints for offshore structures. CIRIA UR33, vol. 3, Part F: Complex Welded, Cast and Composite Joints, 1985.
    Google ScholarLocate open access versionFindings
  • Roark RJ. Formulas for stress and strains. New York: McGraw-Hill Publishing, 1965.
    Google ScholarFindings
  • Krasenberg RW. Ring stiffeners in circular hollow section joints. Final thesis, Delft University of Technology, 1990.
    Google ScholarFindings
  • Lee MMK, Dexter EM, Kirkwood MG. Strength of moment loaded tubular T/Y-joints in offshore platforms. Struct. Eng. J. Inst. Struct. Eng. 1995;73(15):239–46.
    Google ScholarLocate open access versionFindings
  • Lee MMK, Wilmshurst SR. Numerical modelling of CHS joints with multiplanar double-K configuration. J. Construct. Steel Res. 1995;32:281–301.
    Google ScholarLocate open access versionFindings
  • Dexter EM, Lee MMK, Kirkwood MG. Overlapped K joints in circular hollow sections under axial loading. J. Offshore Mech. Arctic Engng Trans. Am. Soc. Mech. Eng. 1996;118(1):53–61.
    Google ScholarLocate open access versionFindings
  • ABAQUS Version 5.5, User’s manuals I and II, theory manual. Hibbit, Karlson and Sorensen
    Google ScholarFindings
  • Kurobane Y, Makino Y, Ochi K. Ultimate resistance of unstiffened tubular joints. J. Struct. Engng Am. Soc. Civil Eng. 1984;110(2):385–400.
    Google ScholarLocate open access versionFindings
  • Pan RB, Plummer FB, Kuang JG. Ultimate strength of tubular joints. J. Petrol. Technol. 1977;29(4):449–60.
    Google ScholarLocate open access versionFindings
  • Stol HGA, Puthli RS, Bijlaard FSK. Experimental research on tubular T-joints under proportionally applied combined static loading. In: Behaviour of offshore structures. Amsterdam: Elsevier, 1985:134–43.
    Google ScholarFindings
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