Smart Structures and Systems

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Seismic isolation performance sensitivity to potential deviations from design values

  • Alhan, Cenk (Department of Civil Engineering, Istanbul University) ;
  • Hisman, Kemal (Department of Civil Engineering, Istanbul University)
  • Received : 2015.07.31
  • Accepted : 2016.05.20
  • Published : 2016.08.25
⟨ Previous Next ⟩

Abstract

Seismic isolation is often used in protecting mission-critical structures including hospitals, data centers, telecommunication buildings, etc. Such structures typically house vibration-sensitive equipment which has to provide continued service but may fail in case sustained accelerations during earthquakes exceed threshold limit values. Thus, peak floor acceleration is one of the two main parameters that control the design of such structures while the other one is peak base displacement since the overall safety of the structure depends on the safety of the isolation system. And in case peak base displacement exceeds the design base displacement during an earthquake, rupture and/or buckling of isolators as well as bumping against stops around the seismic gap may occur. Therefore, obtaining accurate peak floor accelerations and peak base displacement is vital. However, although nominal design values for isolation system and superstructure parameters are calculated in order to meet target peak design base displacement and peak floor accelerations, their actual values may potentially deviate from these nominal design values. In this study, the sensitivity of the seismic performance of structures equipped with linear and nonlinear seismic isolation systems to the aforementioned potential deviations is assessed in the context of a benchmark shear building under different earthquake records with near-fault and far-fault characteristics. The results put forth the degree of sensitivity of peak top floor acceleration and peak base displacement to superstructure parameters including mass, stiffness, and damping and isolation system parameters including stiffness, damping, yield strength, yield displacement, and post-yield to pre-yield stiffness ratio.

Keywords

Acknowledgement

Supported by : Istanbul University

References

  1. Alhan, C. and Gavin, H.P. (2004), "A parametric study of linear and non-linear passively damped seismic isolation systems for buildings", Eng. Struct., 26(4), 485-497. https://doi.org/10.1016/j.engstruct.2003.11.004
  2. Alhan, C. and Ozgur, M. (2015), "Seismic responses of base-isolated buildings: efficacy of equivalent linear modeling under near-fault earthquakes", Smart Struct. Syst., 15(6), 1439-1461. https://doi.org/10.12989/sss.2015.15.6.1439
  3. Alhan, C. and Surmeli, M. (2011), "Shear building representations of seismically isolated buildings", Bull. Earthq. Eng., 9, 1643-1671. https://doi.org/10.1007/s10518-011-9293-z
  4. Benzoni, G. (editor) (2015), Proceedings on electronic key of the 14th world conference on seismic isolation, energy dissipation and active vibration control of Structures, San Diego, California, USA, September 9-11, 2015.
  5. Casciati, S., Chassiakos, A.G. and Masri, S.F. (2014), "Toward a paradigm for civil structural control", Smart Struct. Syst., 14(5), 981-1004. https://doi.org/10.12989/sss.2014.14.5.981
  6. Charmpis, D.C., Komodromos, P. and Phocas, M.C. (2012), "Optimized earthquake response of multi-storey buildings with seismic isolation at various elevations", Earthq. Eng. Struct. D., 41(15), 2289-2310. https://doi.org/10.1002/eqe.2187
  7. Cheng, F.Y., Jiang, H. and Lou, K. (2008), Smart structures: Innovative systems for seismic response control, CRC Press, Taylor & Francis Group, Boca Raton.
  8. Chopra, A.K. (2001), Dynamics of structures: Theory and applications to earthquake engineering, 2nd edition, Pearson Education, Inc, NJ, USA.
  9. Contento, A. and Di Egidio, A. (2014), "On the use of base isolation for the protection of rigid bodies placed on a multi-storey frame under seismic excitation", Eng. Struct., 62-63, 1-10. https://doi.org/10.1016/j.engstruct.2014.01.019
  10. Falsone, G. and Ferro, G. (2006), "Best performing parameters of linear and non-linear seismic base isolator systems obtained by the power flow analysis", Comput. Struct., 84(31-32), 2291-2305. https://doi.org/10.1016/j.compstruc.2006.08.068
  11. Gavin, H., Alhan, C. and Oka, N. (2003), "Fault-tolerance of semiactive isolation", J. Struct. Eng.-ASCE, 129(7), 922-932. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:7(922)
  12. Guo, T., Xu, W., Song, L.L. and Wei, W. (2014), "Seismic-isolation retrofits of school buildings: Practice in china after recent devastating earthquakes", J. Perform. Constr. Fac., 9, 147-171.
  13. Hirata, K., Shiojiri, H., Mazda, T. and Kontani, O. (1989), "Response variability of isolated structure due to randomness of isolation devices", ICOSSAR 89, Proceedings of the 5th International Conference on Structural Safety and Reliability, San Francisco, 7-11 August, 1989.
  14. Hisman, K. (2011), "Sensitivity of the performances of seismic isolation platforms to small deviations in mechanical properties of seismic isolators", MSc Thesis, Department of Civil Engineering, Institute of Science, Istanbul University (in Turkish).
  15. Huang, P.C., Wan, S. and Yen, J.Y. (2009), "A novel method of searching appropriate ranges of base isolation design parameters through entropy-based classification", Struct. Control Health. Monit., 16(4), 385-405. https://doi.org/10.1002/stc.259
  16. Jangid, R.S. (2007), "Optimum lead-rubber isolation bearings for near-fault motions", Eng. Struct., 29(10), 2503-2513. https://doi.org/10.1016/j.engstruct.2006.12.010
  17. Kamalzare, M., Johnson, E.A. and Wojtkiewicz, S.F. (2015) "Efficient optimal design of passive structural control applied to isolator design", Smart Struct. Syst., 15(3), 847-862. https://doi.org/10.12989/sss.2015.15.3.847
  18. Kasai, K., Mita, A., Kitamura, H., Matsuda, K., Morgan, T.A. and Taylor, A.W. (2013), "Performance of seismic protection technologies during the 2011 Tohoku-Oki Earthquake", Earthq. Spectra, 29(51), 265-293. https://doi.org/10.1193/1.4000131
  19. Komodromos, P. (2000), Seismic isolation for earthquake-resistant structures, WIT Press, Southampton, UK.
  20. Liu, T., Zordan, T., Briseghella, B. and Zhang, Q. (2014), "An improved equivalent linear model of seismic isolation system with bilinear behavior", Eng. Struct., 61, 113-126. https://doi.org/10.1016/j.engstruct.2014.01.013
  21. Martelli, A., Clemente, P. and De Stefano, A. (2014b), "How to ensure seismic safety of schools, hospitals, museums and other strategic or public structures if the existing buildings are monumental or simply old", PROHITECH'14, Proceedings of the 2nd International Conference on Protection of Historical Constructions, Bogazici University Publishing, Editores: F.M. Mazzolani & G. Altay, Antalya, Turkey, 7-9 May, pp. 431-437.
  22. Martelli, A., Clemente, P. and Forni, M. (2015), "Worldwide state-of-the-art of development and application of anti-seismic systems based on the information provided at the ASSISi Sendai Conference in 2013 and later and conditions for their correct use", Key-Note lecture, Proceedings of the 14th World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures, San Diego, USA, 9-11 September, Book of Abstracts, p. 9.
  23. Martelli, A., Clemente, P., De Stefano, A., Forni, M. and Salvatori, A. (2014a), "Recent development and application of seismic isolation and energy dissipation and conditions for their correct use", Perspectives on European Engineering and Seismology, Editor: Atilla Ansal, Book Series: Geotechnical, Geological and Earthquake Engineering, 1, 449-488, Springer.
  24. Mazza, F. and Vulcano, A. (2012), "Effects of near-fault ground motions on the nonlinear dynamic response of base-isolated r.c. framed buildings", Earthq. Eng. Struct. D., 41(2), 211-232. https://doi.org/10.1002/eqe.1126
  25. Morgan, T.A. and Mahin, S.A. (2008), "Performance-based design of seismic isolated buildings considering multiple performance objectives," Smart Struct. Syst., 4(5), 655-666. https://doi.org/10.12989/sss.2008.4.5.655
  26. Naeim, F. and Kelly, J.M. (1999), Design of seismic isolated structures: From theory to practice, John Wiley & Sons, Inc., USA.
  27. Nagarajaiah, S. and Xiaohong, S. (2000), "Response of base-isolated USC hospital building in Northridge earthquake", J. Struct. Eng. - ASCE, 126(10), 1177-1186. https://doi.org/10.1061/(ASCE)0733-9445(2000)126:10(1177)
  28. Nagarajaiah, S., Reinhorn, A.M. and Constantinou, M.C. (1991), "3D-Basis: Nonlinear dynamic analysis of three-dimensional base isolated structures: Part II," Techical Report NCEER-91-0005, National Center for Earthquake Engineering, State University of New York at Buffalo.
  29. Nigdeli, S.M., Bekdas, G. and Alhan C. (2014), "Optimization of seismic isolation systems via harmony search", Eng. Optim., 46(11), 1553-1569. https://doi.org/10.1080/0305215X.2013.854352
  30. Pan, P., Ye, L., Shi, W. and Cao, H.Y. (2012), "Engineering practice of seismic isolation and energy dissipation structures in China", Sci. China-Technol. Sci., 55(11), 3036-3046. https://doi.org/10.1007/s11431-012-4922-6
  31. Pan, P., Zamfirescu, D., Nakashima, M., Nakayasu, N. and Kashiwa, H. (2005), "Base-isolation design practice in Japan: Introduction to the Post-Kobe approach", J. Earthq. Eng., 9(1), 147-171. https://doi.org/10.1080/13632460509350537
  32. Park Y.J., Wen Y.K. and Ang A.H.S. (1986), "Random vibration of hysteretic systems under bi-directional ground motions", Earthq. Eng. Struct. D., 14(4), 543-557. https://doi.org/10.1002/eqe.4290140405
  33. PEER (2005), http://peer.berkeley.edu/smcat/search.html, Peer Strong Motion Databank
  34. Petti, L., Giannattasio, G., De Iuliis, M. and Palazzo, B. (2010), "Small scale experimental testing to verify the effectiveness of the base isolation and tuned massdampers combined control strategy", Smart Struct. Syst., 6(1), 57-72. https://doi.org/10.12989/sss.2010.6.1.057
  35. Shenton III, H.W. and Holloway, E.S. (2000), "Effect of stiffness variability on the response of isolated structures", Earthq. Eng. Struct. D., 29(1), 19-36. https://doi.org/10.1002/(SICI)1096-9845(200001)29:1<19::AID-EQE893>3.0.CO;2-9
  36. Siringoringo, D. and Fujino, Y. (2015), "Seismic response analyses of an asymmetric base-isolated building during the 2011 Great East Japan (Tohoku) Earthquake", Struct. Control Health Monit., 22(1), 71-90. https://doi.org/10.1002/stc.1661
  37. Vassiliou, M.F., Tsiavos, A. and Stojadinovic, B. (2013) "Dynamics of inelastic base-isolated structures subjected to analytical pulse ground motions", Earthq. Eng. Struct. D., 42(14), 2043-2060. https://doi.org/10.1002/eqe.2311