Smart Structures and Systems

  • 제16권4호
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  • Pages.701-723
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  • 2015
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Comparison of seismic behavior of long period SDOF systems mounted on friction isolators under near-field earthquakes

  • Loghman, Vahid (Faculty of Civil Engineering, AmirKabir University of Technology (Tehran Polytechnic)) ;
  • Khoshnoudian, Faramarz (Faculty of Civil Engineering, AmirKabir University of Technology (Tehran Polytechnic))
  • 투고 : 2015.02.15
  • 심사 : 2015.05.03
  • 발행 : 2015.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

Friction isolators are one of the most important types of bearings used to mitigate damages of earthquakes. The adaptive behavior of these isolators allows them to achieve multiple levels of performances and predictable seismic behavior during different earthquake hazard levels. There are three main types of friction isolators. The first generation with one sliding surface is known as Friction Pendulum System (FPS) isolators. The double concave friction pendulum (DCFP) with two sliding surfaces is an advanced form of FPS, and the third one, with fully adaptive behavior, is named as triple concave friction pendulum (TCFP). The current study has been conducted to investigate and compare seismic responses of these three types of isolators. The structure is idealized as a two-dimensional single degree of freedom (SDOF) resting on isolators. The coupled differential equations of motion are derived and solved using state space formulation. Seismic responses of isolated structures using each one of these isolators are investigated under seven near fault earthquake motions. The peak values of bearing displacement and base shear are studied employing the variation of essential parameters such as superstructure period, effective isolation period and effective damping of isolator. The results demonstrate a more efficient seismic behavior of TCFP isolator comparing to the other types of isolators. This efficiency depends on the selected effective isolation period as well as effective isolation damping. The investigation shows that increasing the effective isolation period or decreasing the effective isolation damping improves the seismic behavior of TCFP compared to the other isolators. The maximum difference in seismic responses, the base shear and the bearing displacement, for the TCFP isolator are calculated 26.8 and 13.4 percent less than the DCFP and FPS in effective isolation damping equal to10%, respectively.

키워드

참고문헌

  1. Almazan, J.L., De la llera, J.C. and Inaudi, J.A. (1998), "Modeling aspects of structures isolated with the frictional pendulum system", Earthq. Eng. Struct. D., 27(80), 845-867. https://doi.org/10.1002/(SICI)1096-9845(199808)27:8<845::AID-EQE760>3.0.CO;2-T
  2. ASCE7-10 (2010), Minimum design loads for building and other structures, American Society of Civil Engineers, USA.
  3. Bagheri, M. and Khoshnoudian, F. (2014), "The effect of impact with adjacent structure on seismic behavior of base-isolated buildings with DCFP bearings", Struct. Eng. Mech., 51(2), 277-297. https://doi.org/10.12989/sem.2014.51.2.277
  4. Baker, J.W. (2007), "Quantitative classification of near-fault ground motions using wavelet analysis", B. Seismol. Soc. Am., 97(5), 1486-1501. https://doi.org/10.1785/0120060255
  5. Becker, T.C. and Mahin, S.A. (2011), "Experimental and analytical study of the bi-directional behavior of the triple friction pendulum isolator", Earthq. Eng. Struct. D., Published online in Wiley online Library, DOI:10.1002/eqe.1133.
  6. Becker, T.C. and Mahin, S.A. (2013), "Approximating peak responses in seismically isolated buildings using generalized modal analysis", Earthq. Eng. Struct. D., Published online in Wiley online Library, DOI:10.1002/eqe.2299.
  7. Constantinou, M.C., Kalpakidis, I., Filiatrault, A. and Ecker Lay, R.A. (2011), LRFD-based analysis and design procedures for bridge bearings and seisemic isolation, Technical Report MCEER-11-0004, State University of New York at Buffalo, Buffalo, New York, USA.
  8. Fadi, F. and Constantinou, M.C. (2009), "Evaluation of simplified methods for analysis for structures with triple friction pendulum isolators", Earthq. Eng. Struct. D., 39, 5-22.
  9. FEMA 695 (2009), Quantification of building seismic performance factors, Applied Technology Council, California, USA.
  10. Fenz, D.M. and Constantinou, M.C. (2006), "Behavior of the double concave friction pendulum bearing", Earthq. Eng. Struct. D., 35(11), 1403-1424. https://doi.org/10.1002/eqe.589
  11. Fenz, D.M. and Constantinou, M.C. (2007a), "Spherical sliding isolation bearings with adaptive behavior: Theory", Earthq. Eng. Struct. D., 37(2), 163-183. https://doi.org/10.1002/eqe.751
  12. Fenz, D.M. and Constantinou, M.C. (2007b), "Spherical sliding isolation bearings with adaptive behavior: Experimental verification", Earthq. Eng. Struct. D., 37(2), 185-205. https://doi.org/10.1002/eqe.750
  13. Fenz, D.M. and Constantinou, M.C. (2008a), Mechanical behavior of multi-spherical sliding bearings, Technical Report MCEER-08-0007, State University of New York at Buffalo, Buffalo, New York, USA.
  14. Fenz, D.M. and Constantinou, M.C. (2008b), "Modeling triple friction pendulum bearings for response-history analysis", Earthq. Spectra, 24(4), 1011-1028. https://doi.org/10.1193/1.2982531
  15. Fenz, D.M. and Constantinou, M.C. (2008c), Development, implementation and verification of dynamic analysis models for multi-spherical sliding bearings, Technical Report MCEER-08-0018, Multidisciplinary Center for Earthquake Engineering Research, State University of New York at Buffalo, Buffalo, New York, USA.
  16. Gueraud, R., Noel-leroux, J.P., Livolant, M. and Michalopoulos, A.P. (1985), "Seismic isolation using sliding elastomer bearing pads", Nuclear Eng. Des., 84(3), 363-377. https://doi.org/10.1016/0029-5493(85)90252-3
  17. Kim, Y.S. and Yun, C.B. (2007), "Seismic response characteristics of bridges using double concave friction pendulum bearings with tri-linear behavior", Eng. Struct., 29(11), 3082-3093. https://doi.org/10.1016/j.engstruct.2007.02.009
  18. Khoshnoudian, F. and Hemmati, A. (2011), "Seismic response of base-isolated structures using DCFP bearings wih tri-linear and bi-linear behaviors", Proceedings of the 12th Asia-Pacific Conference on Structural Engineering and Construction. Procedia Engineering.
  19. Khoshnoudian, F, and Rabie, M. (2011), "Response of multistory friction pendulum base-isolated buildings including the vertical component of earthquakes", Can. J. Civil Eng., 38, 1045-1059. https://doi.org/10.1139/l11-064
  20. Khoshnoudian, F. and Rabie, M. (2010), "Earthquake response of double concave friction pendulum base-isolated structures considering vertical component of earthquake", Adv. Struct. Eng., 13 (1). 1-14. https://doi.org/10.1260/1369-4332.13.1.1
  21. Loghman V., Khosnoudian F. and Banazadeh M. (2013), "Effects of vertical component of earthquake on seismic responses of triple concave friction pendulum base-isolated structures", J. Vib. Control., DOI: 10.1177/1077546313503359.
  22. Malekzadeh, M. and Taghikhany, T. (2010), "Adaptive behavior of double concave friction pendulum bearing and its advantages over friction pendulum systems", Scientla Iranica, 17(2), 81-88.
  23. Matsagar, V.A. and Jangid, R.S. (2004), "Influence of isolator characteristics on the response of base-isolated structures", Eng. Struct., 26(12), 1735-1749. https://doi.org/10.1016/j.engstruct.2004.06.011
  24. Morgan, T.A. and Mahin, S.A. (2011), The use of base-isolation system to achieve complex seismic performance objectives, Peer Report 2011/06, Pacific Earthquake Engineering Research Center, College of Engineering University of California, Berkeley, USA.
  25. Mostaghel, N. and Khodaverdian, M. (1987), "Dynamics of resilient-friction base isolator (R-FBI)", Earthq. Eng. Struct. D., 15(3), 379-390. https://doi.org/10.1002/eqe.4290150307
  26. Mostaghel, N. and Tanbakuchi, J. (1983), "Response of sliding structures to earthquake support motion", Earthq. Eng. Struct. D., 11(6), 729-748. https://doi.org/10.1002/eqe.4290110603
  27. Panchal, V.R. and Jangid, R.S. (2008), "Seismic behavior of variable frequency pendulum isolator", Earthq. Eng. Eng. Vib., 7,193-205. https://doi.org/10.1007/s11803-008-0824-9
  28. Panchal, V.R. and Jangid, R.S. (2011), "Performance of variable friction pendulum system for torsionally coupled structures", J. Vib. Contol., 18(3), 323-343.
  29. Pant, D.R., Constantinou, M.C. and Wijeyewickrema, A.C. (2013), "Re-evaluation of equivalent lateral force procedure for prediction of displacement demand in seismically isolated structures", Eng. Struct., 52, 455-465. https://doi.org/10.1016/j.engstruct.2013.03.013
  30. Scheller, J. and Constantinou, M.C. (1999), Response history analysis of structures with seismic isolation and energy dissipation systems: Verification examples for program SAP2000, Technical Report No. MCEER 99-02, Multidisciplinary Center for Earthquake Engineering Research, Buffalo, New York, USA.
  31. Tajammolian, H., Khoshnoudian, F., Talaee, S. and Loghman, V. (2014) "The effects of peak ground velocity of near-field ground motions on the seismic responses of base-isolated structures mounted on friction isolators", Earthq. Struct., 7(6), 1159-1282.
  32. Tsai, C.S., Chen, B.J., Pong, W.S. and Chiang, T.C. (2004), "Interactive behavior of structures with multiple friction pendulum isolation system and unbounded foundations", Adv. Struct. Eng., 7(6), 539-551. https://doi.org/10.1260/1369433042863189
  33. Tsai, C.S., Chiang, T.C. and Chen, B.J. (2005), "Experimental evaluation of piece wise exact solution for predicting seismic responses of spherical sliding type isolated structures", Earthq. Eng. Struct. D., 34(9), 1027-1046. https://doi.org/10.1002/eqe.430
  34. Yang, Y.B., Lee, T.Y. and Tsai, I.C. (1990), "Response of multi-degree-of-freedom structures with sliding supports", Earthq. Eng. Struct. D., 19(5), 739-752. https://doi.org/10.1002/eqe.4290190509
  35. Zayas, V.A., Low, S.S. and Mahin, S.A. (1987), The FPS earthquake resisting system, Experimental report No. UCB/EERC 87/01, EERC, University of California, Berkeley, USA.
  36. Zayas, V.A., Low, S.S. and Mahin, S.A. (1990), "A simple pendulum technique for achieving seismic isolation", Earthq. Spectra, 6(2), 317-333. https://doi.org/10.1193/1.1585573

피인용 문헌

  1. Seismic Responses of Isolated Structures with Mass Asymmetry Mounted on TCFP Subjected to Near-Fault Ground Motions vol.14, pp.8, 2016, https://doi.org/10.1007/s40999-016-0047-9
  2. Cyclic behaviour of triple friction pendulum isolators with elliptical surfaces vol.174, pp.3, 2015, https://doi.org/10.1680/jstbu.18.00186