Capacity Evaluation of Ressalat Jacket of Persian Gulf Considering Proper Finite Element Modeling of Tubular Members

Authors

Sharif University of Technology

Abstract

The capacity curve obtained from the pushover analysis of jacket-type offshore platforms gives their structural performance levels, ultimate capacity and ductility. Accurate estimation of structural capacity curve is of great importance. Accurate modeling of the global and local buckling of compression tubular members in a correct form is an effective part of studying the behavior of offshore jackets under all various types of loading conditions at any given time of their life. Modeling of compressive braces by shell or solid elements when the imperfections are applied leads to deformations due to local buckling based on buckling modes. This paper aims to achieve more accurate compressive behavior of compression members. The ABAQUS finite element software has been used for this purpose. Regarding to the results achieved from investigation of buckling in tubular members proper elements have been introduced to investigate the global and local buckling phenomena. Then pushovers results of Ressalat jacket with conventional modeling versus more accurate modeling proposed in this paper for compressive members have been compared as a case study. According to the results applying improper mesh size for compressive members can under-predict the ductility by 33% and under-estimate the lateral loading capacity up to 8%. Finally, ISO equations and Marshall strut theory have been applied to investigate critical buckling load and post-buckling response of tubular braces. The innovation of this paper is investigating the interaction of global and local buckling in the braces of jacket with 1-Dimentional elements using ISO equations and buckling envelope derived from the solid element results, which results in low computational costs.

Keywords

References

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  2. 1- Karamanos, S.A., Tassoulas, J.L., (1996), Tubular members II: local buckling and experimental verification, Journal of engineering mechanics, 122(1), p. 72-78. [DOI:10.1061/(ASCE)0733-9399(1996)122:1(72)]
  3. Sadowski, A.J., Rotter, J.M., (2013), solid or shell finite elements to model thick cylindrical tubes and shells under global bending, International journal of mechanical sciences, 74, pp.143-153. [DOI:10.1016/j.ijmecsci.2013.05.008]
  4. Bardi, F.C., Kyriakides, S., (2006), Plastic buckling of circular tubes under axial compression-part I: experiments, International journal of mechanical sciences, 48(8), pp.830-841. [DOI:10.1016/j.ijmecsci.2006.03.005]
  5. Bardi, F.C., Kyriakides, S., Yun, H.D., (2006), Plastic buckling of circular tubes under axial compression-part II: analysis, International journal of mechanical sciences, 48(8), pp.842-854. [DOI:10.1016/j.ijmecsci.2006.03.002]
  6. Yasseri, S., Skinner, K., Styles, D., (2006), Post buckling response study for high D/t tubular members, Technical report.
  7. Xia, W. and Hoogenboom, P.C.J., (2011), Buckling analysis of offshore jackets in removal operations, ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering (pp. 449-454), American Society of Mechanical Engineers. [DOI:10.1115/OMAE2011-49601]
  8. Fernando, P., Rodrigues, N., Jacob, BP., (2005), Collapse analysis of steel jacket structures for offshore oil exploitation, Journal of constructional steel research, 61. [DOI:10.1016/j.jcsr.2005.02.005]
  9. (2007), ISO 19902, International Standard: Petroleum and natural gas industries-fixed steel offshore structures, First edition.
  10. Marshall, P.W., (1992), Design of welded tubular connections, basis and use of AWS code provisions, Elsevier.
  11. Simulia, D.S. (Dassault Systèmes), (2012), Abaqus 6.12 documentation, Providence, Rhode Island, US, 261.
  12. Tabeshpour, M.R., Erfani, M.H., Sayyadi, H., (2016), Study on ultimate capacity of offshore jacket platforms by using beam elements, considering the effects of global and local buckling of the elements, 18th international conference of marine industries (MIC2016), Kish Island.
  13. Tabeshpour, M.R., Erfani, M.H. and Sayyaadi, H., (2019), Challenges in calculation of critical buckling load of tubular members of jacket platforms in finite element modeling, Journal of marine science and technology, pp.1-21. [DOI:10.1007/s00773-019-00686-5]
  14. Tabeshpour, M.R., Erfani, M.H. and Sayyadi, H., (2019), Study on ultimate capacity of offshore jacket platforms considering the effects of general and local buckling of the elements, Advances in Solid and Fluid Mechanics., 1(1), pp.9-17.
  15. Tabeshpour, M.R., Erfani, M.H. and Sayyadi, H., (2018), Investigation of uncertainties in buckling and post-buckling behavior of typical braces of offshore jacket platforms by using solid elements in ABAQUS, 20th international conference of marine industries (MIC2018), Tehran.
  16. Su, R.K. and Wang, L., (2015), Flexural and axial strengthening of preloaded concrete columns under large eccentric loads by flat and precambered steel plates, Structure and infrastructure engineering, 11(8), pp.1083-1101. [DOI:10.1080/15732479.2014.936879]

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