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Vibration Analysis of Welded Tubular Structures Considering Local Joint Flexibility

Received: 5 December 2017     Published: 6 December 2017
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Abstract

Welded tubular structure is the backbone of offshore jacket platform. As a thin-walled structure, local joint flexibility (LJF) in a tubular structure is prominent, and it may produce significant effect on the dynamic performance for the overall structure. This study presents a simplified model to analyze the dynamic behavior of a steel tubular structure with LJF. The presented model simplifies a tubular structure into a frame model consisted of beam elements with considering the LJFs at the connections between any two elements. The LJF is simulated with a fictitious beam element (FBE). Methods for defining the dimensions of the cross section and the material properties of the FBE are provided. The accuracy of the presented method is verified through comparing with three dimensional (3D) finite element results on the vibration of a tubular structure. The tested results indicate that LJF has remarkable effect on the vibration of welded tubular structures, and the simplified model presented in this study can provide more accurate estimation compared to conventional rigid frame model.

Published in American Journal of Mechanics and Applications (Volume 5, Issue 5)
DOI 10.11648/j.ajma.20170505.11
Page(s) 41-46
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2017. Published by Science Publishing Group

Keywords

Welded Tubular Structure, Local joint Flexibility (LJF), Simplified Model, Fictitious Beam Element (FBE), Vibration

References
[1] API. Recommended practice for planning, designing and constructing heliports for fixed offshore platforms. API PR2A-WSD, American Petroleum Institute, USA, 2000.
[2] H. Liu, Z. Chen, S. Xu, Y. Bu, “Structural behavior of aluminum reticulated shell structures considering semi-rigid and skin effect”, Steel and Composite Structures, 2015, vol. 54, pp. 121-133.
[3] B. Z. Chen, Y. R. Hu, M. J. Tan, “Local joint flexibility of tubular joints of offshore, structures”, Marine Structures, 1990, vol. 3, pp. 177-197.
[4] L. X. Yang, T. Y. Chen, S. Y. Wu, “Local flexibility behavior of tubular joints and its effect on global analysis of tubular structures”, China Ocean Engineering, 1990, vol. 4, pp. 371-384.
[5] Y. R. Hu, B. Z. Chen, M. J. Tan, “An equivalent element representing local flexibility of tubular joints in structural analysis of offshore platforms”, Computers and Structures, 1993, vol. 47, pp. 957-969.
[6] T. Chen, H. Zhang, “Stress analysis of spatial frames with consideration of local flexibility of multiplanar tubular joint”, Engineering Structures, 1996, vol. 18, pp. 465-471.
[7] W. Wang, Y. Y. Chen, “Modeling and classification of tubular joint rigidity and its effect on the global response of CHS lattice girders”, Structural Engineering and Mechanics, vol. 21, pp. 677-698.
[8] M. Mirtaheri, H. Ali Zakeri, P. Alanjari, M. Amin Assareh, “Effect of joint flexibility on overall behavior of jacket type offshore platforms”, American Journal of Engineering and Applied Sciences, 2009, vol. 2, pp. 25-30.
[9] P. Alanjari, B. Asgarian, M. Kia, “Nonlinear joint flexibility element for the modelling of jacket-type offshore platforms”, Applied Ocean Research, 2011, vol. 33, pp. 147-157.
[10] J. G. Bouwkamp, “An improved joint model and equations for flexibility of tubular joints”, Journal of Petroleum Technology, 1996, vol. 18, pp. 1491-1499.
[11] Y. Ueda, S. M. H. Rashed, K. Nakacho, “An improved joint model and equations for flexibility of tubular joints”, Journal of Offshore Mechanics and Arctic Engineering, 1990, vol. 112, pp. 157-168.
[12] G. Z. Qiu, J. C. Zhao, “Analysis and calculation of axial stiffness of tubular X-joints under compression on braces”, Journal of Shanghai Jiaotong University (Science Edition), 2009, vol. 14, pp. 410-417.
[13] G. Z. Qiu, J. H. Gong, J. C. Zhao, “Parametric formulae for axial stiffness of CHS X-joints subjected to brace axial tension”, Journal of Zhejiang University - Science A (Applied Physics & Engineering), 2011, vol. 12, pp. 121-130.
[14] F. Gao, B. Hu, H. P. Zhu, “Parametric equations to predict LJF of completely overlapped tubular joints under lap brace axial loading”, Journal of Constructional Steel Research, 2013, vol. 89, pp. 284-292.
[15] F. Gao, B. Hu, H. P. Zhu, “Local joint flexibility of completely overlapped tubular joints under in-plane bending”, Journal of Constructional Steel Research, 2014, vol. 99, pp. 1-9.
[16] L. J. Jia, Y. Y. Chen, “Evaluation of elastic in-plane flexural rigidity of unstiffened multiplanar CHS X-joints”, International Journal of Steel Structures, 2014, vol. 14, pp. 23-30.
[17] B. Asgarian, V. Mokarram, P. Alanjari, “Local joint flexibility equations for Y-, T and K-type tubular joints”, Ocean System Engineering, 2014, vol. 4, pp. 151-167.
[18] H. Fessler, P. B. Mockford, J. J. Webster, “Parametric equations for the flexibility matrix of single brace tubular joint in offshore structures”, Proceedings of the Institution of Civil Engineers, 1986, vol. 81, pp. 659-673.
Cite This Article
  • APA Style

    Yamin Wang, Yongbo Shao, Shanshan Tu, Dongping Yang, Gengqi Niu, et al. (2017). Vibration Analysis of Welded Tubular Structures Considering Local Joint Flexibility. American Journal of Mechanics and Applications, 5(5), 41-46. https://doi.org/10.11648/j.ajma.20170505.11

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    ACS Style

    Yamin Wang; Yongbo Shao; Shanshan Tu; Dongping Yang; Gengqi Niu, et al. Vibration Analysis of Welded Tubular Structures Considering Local Joint Flexibility. Am. J. Mech. Appl. 2017, 5(5), 41-46. doi: 10.11648/j.ajma.20170505.11

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    AMA Style

    Yamin Wang, Yongbo Shao, Shanshan Tu, Dongping Yang, Gengqi Niu, et al. Vibration Analysis of Welded Tubular Structures Considering Local Joint Flexibility. Am J Mech Appl. 2017;5(5):41-46. doi: 10.11648/j.ajma.20170505.11

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  • @article{10.11648/j.ajma.20170505.11,
      author = {Yamin Wang and Yongbo Shao and Shanshan Tu and Dongping Yang and Gengqi Niu and Fengle Long},
      title = {Vibration Analysis of Welded Tubular Structures Considering Local Joint Flexibility},
      journal = {American Journal of Mechanics and Applications},
      volume = {5},
      number = {5},
      pages = {41-46},
      doi = {10.11648/j.ajma.20170505.11},
      url = {https://doi.org/10.11648/j.ajma.20170505.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajma.20170505.11},
      abstract = {Welded tubular structure is the backbone of offshore jacket platform. As a thin-walled structure, local joint flexibility (LJF) in a tubular structure is prominent, and it may produce significant effect on the dynamic performance for the overall structure. This study presents a simplified model to analyze the dynamic behavior of a steel tubular structure with LJF. The presented model simplifies a tubular structure into a frame model consisted of beam elements with considering the LJFs at the connections between any two elements. The LJF is simulated with a fictitious beam element (FBE). Methods for defining the dimensions of the cross section and the material properties of the FBE are provided. The accuracy of the presented method is verified through comparing with three dimensional (3D) finite element results on the vibration of a tubular structure. The tested results indicate that LJF has remarkable effect on the vibration of welded tubular structures, and the simplified model presented in this study can provide more accurate estimation compared to conventional rigid frame model.},
     year = {2017}
    }
    

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    T1  - Vibration Analysis of Welded Tubular Structures Considering Local Joint Flexibility
    AU  - Yamin Wang
    AU  - Yongbo Shao
    AU  - Shanshan Tu
    AU  - Dongping Yang
    AU  - Gengqi Niu
    AU  - Fengle Long
    Y1  - 2017/12/06
    PY  - 2017
    N1  - https://doi.org/10.11648/j.ajma.20170505.11
    DO  - 10.11648/j.ajma.20170505.11
    T2  - American Journal of Mechanics and Applications
    JF  - American Journal of Mechanics and Applications
    JO  - American Journal of Mechanics and Applications
    SP  - 41
    EP  - 46
    PB  - Science Publishing Group
    SN  - 2376-6131
    UR  - https://doi.org/10.11648/j.ajma.20170505.11
    AB  - Welded tubular structure is the backbone of offshore jacket platform. As a thin-walled structure, local joint flexibility (LJF) in a tubular structure is prominent, and it may produce significant effect on the dynamic performance for the overall structure. This study presents a simplified model to analyze the dynamic behavior of a steel tubular structure with LJF. The presented model simplifies a tubular structure into a frame model consisted of beam elements with considering the LJFs at the connections between any two elements. The LJF is simulated with a fictitious beam element (FBE). Methods for defining the dimensions of the cross section and the material properties of the FBE are provided. The accuracy of the presented method is verified through comparing with three dimensional (3D) finite element results on the vibration of a tubular structure. The tested results indicate that LJF has remarkable effect on the vibration of welded tubular structures, and the simplified model presented in this study can provide more accurate estimation compared to conventional rigid frame model.
    VL  - 5
    IS  - 5
    ER  - 

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Author Information
  • School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, China

  • School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, China

  • School of Civil Engineering, Yantai University, Yantai, China

  • Technology Inspection Centerr, China Petroleum & Chemical Corporation, Dongying, China

  • Technology Inspection Centerr, China Petroleum & Chemical Corporation, Dongying, China

  • Technology Inspection Centerr, China Petroleum & Chemical Corporation, Dongying, China

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