Smart Structures and Systems

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Structural model updating of the Gageocho Ocean Research Station using mass reallocation method

  • Kim, Byungmo (Department of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Korea Maritime and Ocean University) ;
  • Yi, Jin-Hak (Department of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Korea Maritime and Ocean University)
  • Received : 2019.12.17
  • Accepted : 2020.06.07
  • Published : 2020.09.25
⟨ Previous Next ⟩

Abstract

To study oceanic and meteorological problems related to climate change, Korea has been operating several ocean research stations (ORSs). In 2011, the Gageocho ORS was attacked by Typhoon Muifa, and its structural members and several observation devices were severely damaged. After this event, the Gageocho ORS was rehabilitated with 5 m height to account for 100-yr extreme wave height, and the vibration measurement system was equipped to monitor the structural vibrational characteristics including natural frequencies and modal damping ratios. In this study, a mass reallocation method is presented for structural model updating of the Gageocho ORS based on the experimentally identified natural frequencies. A preliminary finite element (FE) model was constructed based on design drawings, and several of the candidate baseline FE models were manually built, taking into account the different structural conditions such as corroded thickness. Among these candidate baseline FE models, the most reasonable baseline FE model was selected by comparing the differences between the identified and calculated natural frequencies; the most suitable baseline FE model was updated based on the identified modal properties, and by using the pattern search method, which is one of direct search optimization methods. The mass reallocation method is newly proposed as a means to determine the equivalent mass quantities along the height and in a floor. It was found that the natural frequencies calculated based on the updated FE model was very close to the identified natural frequencies. In conclusion, it is expected that these results, which were obtained by updating a baseline FE model, can be useful for establishing the reference database for jacket-type offshore structures, and assessing the structural integrity of the Gageocho ORS.

Keywords

Acknowledgement

This research was supported by the project titled "Construction of Ocean Research Station and Their Application Studies" funded by the Ministry of Oceans and Fisheries, South Korea

References

  1. Ansys Inc. (2017), Ansys Mechanical Advanced Parametric Design Language v17.1.
  2. Baji, H. (2014), "The effect of uncertainty in material properties and model error on the reliability of strength and ductility of reinforced concrete members", Ph.D. Dissertation, University of Queensland, Brisbane, Australia.
  3. Bayraktar, A., Sevim, B. and Altunisika, A.C. (2011), "Finite element model updating effects on nonlinear seismic response of arch dam-reservoir-foundation systems", Finite Elem. Anal. Des., 47(2), 85-97. https://doi.org/10.1016/j.finel.2010.09.005
  4. Boscato, G. and Russo, S. (2015), "Global sensitivity-based model updating for heritage structures", Comput.-Aided Civil Infrastruct. Eng., 30(8), 620-635. https://doi.org/10.1111/mice.12138
  5. Cremona, C. and Santos, J. (2018), "Structural health monitoring as a big-data problem", Struct. Eng. Int., 28(3), 243-254. https://doi.org/10.1080/10168664.2018.1461536
  6. Deng, L. and Cai, C.S. (2010), "Bridge model updating using response surface method and genetic algorithm", J. Bridge Eng., 15(5), 553-564. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000092
  7. Engineering Dynamics, Inc. (1995), SACS USER'S MANUAL Release 4.
  8. Fang, S.E. and Perera, R. (2009), "A response surface methodology based damage identification technique", Smart Mater. Struct., 18(6), 065009. https://doi.org/10.1088/0964-1726/18/6/065009
  9. Foti, D., Diaferio, M., Giannoccaro, N.I. and Mongelli, M. (2012), "Ambient vibration testing, dynamic identification and model updating of a historic tower", NDT&E Int., 47, 88-95. https://doi.org/10.1016/j.ndteint.2011.11.009
  10. Fritzen, C.P., Klinkov, M., Kraemerbbs, P. and Koranyi, B. (2013), Vibration-Based Damage Diagnosis and Monitoring of External Loads, W. Ostachowicz and J.A. Guemes (eds.), New Trends in Structural Health Monitoring, January.
  11. Han, J.P. and Luo, Y.P. (2013), "Static and dynamic finite element model updating of a rigid frame-continuous girders bridge based on response surface method", Adv. Mater. Res., 639-640, 992-997. https://doi.org/10.4028/www.scientific.net/AMR.639-640.992
  12. Hess, P.E., Bruchman, D., Assakkaf, I.A. and Ayyub, B.M. (2002), "Uncertainties in material and geometric strength and load variables", Naval Engr. J., 114(2), 139-166. https://doi.org/10.1111/j.1559-3584.2002.tb00128.x
  13. Hosseinlou, F. and Mojtahedi, A. (2016), "FEM Updating for Offshore Jacket Structures Using measured Incomplete Modal Data", Int. J. Maritime Technol., 5, 1-11.
  14. Hosseinlou, F., Mojtahedi, A. and Yaghin, M.A.L. (2017), "Developing a SIM strategy for offshore jacket platforms based on the FE model updating and a novel simplified method", Ocean Eng., 145, 158-176. https://doi.org/10.1016/j.oceaneng.2017.08.013
  15. Jacquenot, G. (2009), Example of convergence of a direct search method on Broyden function. https://commons.wikimedia.org/wiki/File:Direct_search_BROYDEN.gif (Accessed 11 August 2019)
  16. Kim, D.H., Shim, J.S. and Min, I.K. (2006), "Dynamic response of Ieodo ocean research station", J. Coastal Ocean Engr., 18(1), 53-62. [In Korean]
  17. Kim, W., Yi, J.H., Min, I.K. and Shim, J.S. (2017), "Estimation of dynamic characteristics of Gageocho Ocean Research Station using long-term measurement data", J. Coastal Disaster Prev., 4(5), 263-270. [In Korean] https://doi.org/10.20481/kscdp.2017.4.5.263
  18. Kim, B., Kim, C. and Yi, J.H. (2019), "Model Updating for Gageocho Ocean Research Station Structure Using Structural Dynamic Characteristics", J. Coastal Disast. Prev., 6(5), 103-110. [In Korean] https://doi.org/10.20481/kscdp.2019.6.3.103
  19. Lei, Y., Wang, H.F. and Shen, W.A. (2012), "Update the finite element model of Canton Tower based on direct matrix updating with incomplete modal data", Smart Struct. Syst., Int. J., 10(4-5), 471-483. https://doi.org/10.12989/sss.2012.10.4_5.471
  20. Li, Y. and Li, H. (2011), "Boundary Updating of Offshore Jacket Structures Based on Measured Modal Frequencies", Proceedings of the 21st (2011) International Offshore and Polar Engineering Conference, Hawaii, USA, June, pp. 219-225.
  21. Link, M. and Weiland, M. (2009), "Damage identification by multi-model updating in the modal and in the time domain", Mech. Syst. Signal Process., 23(6), 1734-1746. https://doi.org/10.1016/j.ymssp.2008.11.009
  22. Link, M., Weiland, M., and Seckert, Th. (2008), "Computational model updating for damage identification in the time domain", Proceedings of ISMA 2008: International Conference on Noise and Vibration Engineering, Leuven, Belgium, September, pp. 3293-3305.
  23. Mottershead, J.E., Link, M. and Friswell, M.I. (2011), "The sensitivity method in finite element model updating: A tutorial", Mech. Syst. Signal Processing, 25(7), 2275-2296. https://doi.org/10.1016/j.ymssp.2010.10.012
  24. Ni, Y.Q., Xia, Y., Lin, W., Chen, W.H. and Ko, J.M. (2012), "SHM benchmark for high-rise structures: a reduced-order finite element model and field measurement data", Smart Struct. Syst., Int. J., 10(4-5), 412-426. https://doi.org/10.12989/sss.2012.10.4_5.411
  25. Oil & Gas UK. (2012), "The Decommissioning of steel piled jackets in the northern sea region", The United Kingdom Offshore Oil and Gas Industry Association Limited trading as Oil & Gas UK.
  26. Ren, W.X. and Chen, H.B. (2010), "Finite element model updating in structural dynamics by using the response surface method", Eng. Struct., 32(8), 2455-2465. https://doi.org/10.1016/j.engstruct.2010.04.019
  27. Sehgal, S. and Kumar, H. (2015), "Structural dynamic model updating techniques: A state of the art review", Arch. Computat. Methods Eng., 23(3), 515-533. https://doi.org/10.1007/s11831-015-9150-3
  28. Shim, J.S., Chun, I.S., Min, I.K. and Kim, S.S. (2015), "A study on damage recovery for Gageocho ocean research station", KSCE 2015 Convention & Civil Expo, Gunsan, South Korea, October. [In Korean]
  29. Teughels, A. and Roeck, G.D. (2004), "Structural damage identification of the highway bride Z24 by FE model updating", J. Sound Vib., 278(3), 589-610. https://doi.org/10.1016/j.jsv.2003.10.041
  30. The MathWorks, Inc. (2015), MATLAB and Global Optimization Toolbox Release 2015a, Natick, MA, USA.
  31. Woo, C. and Sin, J. (2012), "Precision Safety Diagnosis and Disaster Recovery Design of Gageocho Ocean Research Station", Report No. BSPE98689-10169-7, Korean Ocean Research & Development Institute. [In Korean]
  32. Yi, J.H., Park, J.S., Han, S.H. and Lee, K.S. (2013), "Modal identification of a jacket-type offshore structure using dynamic tilt response and investigation of tidal effects on modal properties", Eng. Struct., 49, 767-781. https://doi.org/10.1016/j.engstruct.2012.12.015
  33. Yu, E. and Chung, L. (2012), "Seismic damage detection of a reinforced concrete structure by finite element model updating", Smart Struct. Syst., Int. J., 9(3), 253-271. https://doi.org/10.12989/sss.2012.9.3.253
  34. Zhou, L., Wang, L., Chen, L. and Ou, J. (2016), "Structural finite element model updating by using response surfaces and radial basis functions", Adv. Struct. Eng., 19(9), 1446-1462. https://doi.org/10.1177/1369433216643876

Cited by

  1. Study on the propagation mechanism of blast waves using the ultra-dynamic strain test system vol.28, pp.1, 2020, https://doi.org/10.12989/sss.2021.28.1.143