Structural Engineering and Mechanics

Techno-Press (테크노프레스)
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Nonlinear, seismic response spectra of smart sliding isolated structures with independently variable MR dampers and variable stiffness SAIVS system

  • Received : 2005.08.30
  • Accepted : 2006.03.30
  • Published : 2006.10.20
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Abstract

Under high velocity, pulse type near source earthquakes semi-active control systems are very effective in reducing seismic response base isolated structures. Semi-active control systems can be classified as: 1) independently variable stiffness, 2) independently variable damping, and 3) combined variable stiffness and damping systems. Several researchers have studied the effectiveness of independently varying damping systems for seismic response reduction of base isolated structures. In this study effectiveness of a combined system consisting of a semi-active independently variable stiffness (SAIVS) device and a magnetorheological (MR) damper in reducing seismic response of base isolated structures is analytically investigated. The SAIVS device can vary the stiffness, and hence the period, of the isolation system; whereas, the MR damper enhances the energy dissipation characteristics of the isolation system. Two separate control algorithms, i.e., a nonlinear tangential stiffness moving average control algorithm for smooth switching of the SAIVS device and a Lyapunov based control algorithm for damping variation of MR damper, are developed. Single and multi degree of freedom systems consisting of sliding base isolation system and both the SAIVS device and MR damper are considered. Results are presented in the form of nonlinear response spectra, and effectiveness of combined variable stiffness and variable damping system in reducing seismic response of sliding base isolated structures is evaluated. It is shown that the combined variable stiffness and variable damping system leads to significant response reduction over cases with variable stiffness or variable damping systems acting independently, over a broad period range.

Keywords

Acknowledgement

Supported by : National Science Foundation

References

  1. Agrawal, A.K., Yang, J.N. and He, W.L, (2003), 'Applications of some semiactive control systems to benchmark cable-stayed bridge', J. Struct. Eng., 129(7), 884-894 https://doi.org/10.1061/(ASCE)0733-9445(2003)129:7(884)
  2. Carlson, J.D. and Chrzan, M.J. (1994), 'Magnetorheological fluid dampers', U.S. Patent No. 5,277,281
  3. Dyke, S.J., Spencer, B.F.J., Sair, M.K. and Carlson, J.D. (1998), 'An experimental study of MR dampers for seismic protection', Smart Materials and Structures, 7, 693-703 https://doi.org/10.1088/0964-1726/7/5/012
  4. Gavin, H.P. (2001), 'Control of seismically excited vibration using electrorheological materials and Lyapunov methods', IEEE Trans. Automatic Control, 9(1), 27-36
  5. He, W.L., Agrawal, A.K. and Yang, J.N. (2003), 'A novel semi-active friction controller for linear structures against earthquakes', J. Struct. Eng., 129(7), 941-950 https://doi.org/10.1061/(ASCE)0733-9445(2003)129:7(941)
  6. Jabbari, F. and Bobrow, J.E. (2002), 'Vibration suppression with resettable device', J. Eng. Mech., 128(9), 916-924 https://doi.org/10.1061/(ASCE)0733-9399(2002)128:9(916)
  7. Kobori, T., Takahashi, M., Nasu, T., Niwa, N. and Ogasawara, K. (1993), 'Seismic response controlled structure with active variable stiffness system', Earthq. Eng. Struct. Dyn., 22, 925-941 https://doi.org/10.1002/eqe.4290221102
  8. Madden, G.J., Symans, M.D. and Wongprasert, N. (2002), 'Experimental verification of seismic response of building frame with adaptive sliding base-isolation system', J. Struct. Eng., 128(8), 1037-1045 https://doi.org/10.1061/(ASCE)0733-9445(2002)128:8(1037)
  9. Makris, N. (1997), 'Rigidity-plasticity-viscosity: Can electrorheological dampers protect base isolated structures from near-source ground motions?', Earthq. Eng. Struct. Dyn., 26, 571-591
  10. Mao, Y. (2002), 'Sliding mode control and nonlinear spectra of smart base isolated structrues', M.S. Thesis, Rice University, Houston, TX, USA
  11. Nagarajaiah, S. and Mate, D. (1998), 'Semi-active control of continuously variable stiffness system', Proc., 2nd World Conf. Structural Control, 1, 397-405
  12. Nagarajaiah, S. and Mao, Y. (2004), 'Response of smart sliding isolated structures with independently variable stiffness and variable damping systems in near fault earthquakes', The US-Korea Joint Seminar/Workshop on Smart Structures Technologies, Seoul, Korea, September
  13. Nagarajaiah, S. and Saharabudhe, S. (2006), 'Seismic response control of smart sliding isolated buildings using variable stiffness systems: An experimental and numerical study', Earthq. Eng. Struct. Dyn., 35(2), 177-197 https://doi.org/10.1002/eqe.514
  14. Nagarajaiah, S., Spencer, B.F. and Yang, J.N. (2004), 'Recent advances in control of civil infrastructure in USA', US-Korea Workshop on Smart Structures, Seoul, Korea, September
  15. Nagarajaiah, S. and Varadarajan, N. (2005), 'Semi-active control of wind excited building with variable stiffness TMD using short time Fourier transform', J. Eng. Struct., 27, 431-441 https://doi.org/10.1016/j.engstruct.2004.10.015
  16. Narasimhan, S. and Nagarajaiah, S. (2005), 'A SIFT semiactive controller for base isolated buildings with variable stiffness isolation systems', Eng. Struct., 27(4), 514-523 https://doi.org/10.1016/j.engstruct.2004.11.010
  17. Sahasrabudhe, S. (2002), 'Semi-active control of sliding isolated buildings and bridges with variable stiffness and damping systems', Ph.D. Thesis, Rice University, Houston, TX, USA
  18. Sahasrabudhe, S. and Nagarajaiah, S. (2005a), 'Experimental study of sliding base-isolated buildings with magnetorheological dampers in near-fault earthquakes', J. Struct. Eng., 131(7), 1025-1034 https://doi.org/10.1061/(ASCE)0733-9445(2005)131:7(1025)
  19. Sahasrabudhe, S. and Nagarajaiah, S. (2005b), 'Semi-active control of sliding isolated bridges using MR dampers: An experimental and numerical study', Earthq. Eng. Struct. Dyn., 34(8), 965-983 https://doi.org/10.1002/eqe.464
  20. Saharabudhe, S. and Nagarajaiah, S. (2005), 'Effectiveness of variable stiffness systems in base isolated bridges subjected to near fault earthquakes: Experimental and numerical study', Int. J. Intelligent Material Systems and Structures, 16(9), 743-756 https://doi.org/10.1177/1045389X05054999
  21. Spencer, B.F., Dyke, S.J., Sain, M.K. and Carlson, J.D. (1997), 'Phenomenological model of a magnetorheological damper', J. Eng. Mech., 123(3), 230-238 https://doi.org/10.1061/(ASCE)0733-9399(1997)123:3(230)
  22. Spencer, B.F., Johnson, E.A. and Ramallo, J.C. (2000), 'Smart isolation for seismic control', JSME Int. J Ser. C., 43(3), 704-711 https://doi.org/10.1299/jsmec.43.704
  23. Spencer, B.F. and Nagarajaiah, S. (2003), 'State of the art of structural control', J. Struct. Eng., 129(7), 845-856 https://doi.org/10.1061/(ASCE)0733-9445(2003)129:7(845)
  24. Symans, M.D. and Constantinou, M.C. (1999), 'Semi-active control systems for seismic protection of structures: A state-of-the-art review', Eng. Struct., 21(6), 469-487 https://doi.org/10.1016/S0141-0296(97)00225-3
  25. Varadarajan, N. and Nagarajaiah, S. (2004), 'Wind response control of building with variable stiffness tuned mass damper using empirical mode decomposition/hilbert transform', J, Eng. Mech., 130(4), 451-458 https://doi.org/10.1061/(ASCE)0733-9399(2004)130:4(451)
  26. Yang, J.N., Kim, J.H. and Agrawal, A.K. (2000), 'Resetting semiactive stiffness damper for seismic response control', J. Struct. Eng., 126(12), 1427-1433 https://doi.org/10.1061/(ASCE)0733-9445(2000)126:12(1427)
  27. Yang, J.N. and Agrawal, A.K. (2002), 'Semi-active hybrid control systems for nonlinear buildings against near-field earthquakes', Eng. Struct., 24(3), 271-280 https://doi.org/10.1016/S0141-0296(01)00094-3
  28. Yang, J.N., Wu, J.C., Kawashima, K. and Unjoh, S. (1995), 'Hybrid control of seismic excited bridge structures', Earthq. Eng. Struct. Dyn., 24, 1437-1451 https://doi.org/10.1002/eqe.4290241103

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