Real-time hybrid simulation of smart base-isolated raised floor systems for high-tech industry

  • Chen, Pei-Ching (Department of Civil and Construction Engineering, National Taiwan University of Science and Technology) ;
  • Hsu, Shiau-Ching (Department of Civil Engineering, National Taiwan University) ;
  • Zhong, You-Jin (Department of Civil Engineering, National Taiwan University) ;
  • Wang, Shiang-Jung (Department of Civil and Construction Engineering, National Taiwan University of Science and Technology)
  • Received : 2018.09.19
  • Accepted : 2018.12.17
  • Published : 2019.01.25


Adopting sloped rolling-type isolation devices underneath a raised floor system has been proved as one of the most effective approaches to mitigate seismic responses of the protected equipment installed above. However, pounding against surrounding walls or other obstructions may occur if such a base-isolated raised floor system is subjected to long-period excitation, leading to adverse effects or even more severe damage. In this study, real-time hybrid simulation (RTHS) is adopted to assess the control performance of a smart base-isolated raised floor system as it is an efficient and cost-effective experimental method. It is composed of multiple sloped rolling-type isolation devices, a rigid steel platen, four magnetorheological (MR) dampers, and protected high-tech equipment. One of the MR dampers is physically tested in the laboratory while the remainders are numerically simulated. In order to consider the effect of input excitation characteristics on the isolation performance, the smart base-isolated raised floor system is assumed to be located at the roof of a building and the ground level. Four control algorithms are designed for the MR dampers including passive-on, switching, modified switching, and fuzzy logic control. Six artificial spectrum-compatible input excitations and three slope angles of the isolation devices are considered in the RTHS. Experimental results demonstrate that the incorporation of semi-active control into a base-isolated raised floor system is effective and feasible in practice for high-tech industry.


Supported by : National Center for Research of Earthquake Engineering (NCREE), Ministry of Science and Technology


  1. AC156 (2010), Acceptance Criteria for Seismic Qualification by Shake-table Testing of Nonstructural Components and Systems. ICC Evaluation Service inc.
  2. Bahar, A., Salavati-Khoshghalb, M. and Ejabati, S.M. (2018), "Seismic protection of smart base-isolated structures using negative stiffness device and regulated damping", Smart Struct. Syst., 21(3), 359-371.
  3. Chae, Y., Kazemibidokhti, K. and Ricles, J.M. (2013), "Adaptive time series compensator for delay compensation of servohydraulic actuator systems for real-time hybrid simulation", Earthq. Eng. Struct. D., 42(11), 1697-1715.
  4. Chai, J.F., Loh, C.H. and Sato, T. (2002), "Modeling of phase spectrum to simulate design ground motions", J. Chinese Inst. Engineers, 25(4), 447-459.
  5. Chen, P.C. and Tsai, K.C. (2013) "Dual compensation strategy for real-time hybrid testing", Earthq. Eng. Struct. D., 42(1), 1-23.
  6. Cho, S.W., Kim, B.W., Jung, H.J. and Lee, I.W. (2005) "Implementation of modal control for seismically excited structures using magnetorheological dampers", Journal of Engineering Mechanics (ASCE), 131(2), 177-184.
  7. Darby, A.P., Williams, M.S. and Blakeborough, A. (2002), "Stability delay compensation for real-time substructure testing", J. Eng. Mech. - ASCE, 128(12), 1276 -1284.
  8. Dyke, S.J., Spencer, B.F., Sain, M.K. and Carlson, J.D. (1996) "Modeling and control of magnetorheological dampers for seismic response reduction", Smart Mater. Struct., 5(5), 565-575.
  9. Friedman, A., Dyke, S.J., Phillips, B.M., Ahn, R., Dong, B., Chae, Y., Castaneda, N., Jiang, Z., Zhang, J., Cha, Y., Ozdagli, A.I., Spencer, B.F., Ricles J.M., Christenson, R., Agrawal, A. and Sause, R. (2015), "Large-scale real-time hybrid simulation for evaluation of advanced damping system performance", J. Struct. Eng. - ASCE, 141(6), 04014150.
  10. Hayati, S. and Song, W. (2017) "An optimal discrete-time feedforward compensator for real-time hybrid simulation", Smart Struct. Syst., 20(4), 483-498.
  11. Horiuchi, T., Inoue, M., Konno, T. and Namita, Y. (1999), "Realtime hybrid experimental system with actuator delay compensation and its application to a piping system with energy absorber", Earthq. Eng. Struct. D., 28(10), 1121-1141.<1121::AID-EQE858>3.0.CO;2-O
  12. Javanbakht, M. and Amini, F. (2016), "Application of simple adaptive control to an mr damper-based control system for seismically excited nonlinear buildings", Smart Struct. Syst., 18(6), 1251-1267.
  13. Jung, R.Y., Shing, P.B., Stauffer, E. and Bradford, T. (2007), "Performance of a real-time pseudodynamic test system considering nonlinear structural response", Earthq. Eng. Struct. D., 36(12), 1785-1809.
  14. Liao, W.I., Chai, J.F., Loh, C.H. and Huang, S.H. (2013), "Seismic performance of raised floor system by shake-table excitations", Struct. Des. Tall Spec. Build., 22(10), 770-782.
  15. Mamdani, E.H. (1974), "Application of fuzzy algorithms for control of simple dynamic plant", Proceedings of the Institution of Electrical Engineers, 121(12), 1585-1588.
  16. Ramallo, J.C., Johnson, E.A. and Spencer, B.F. (2002), "Smart base isolation systems", J. Eng. Mech. - ASCE, 128(10), 1088-1099.
  17. Shao, X., Lindt, J., Bahmani, P., Pang, W., Ziaei, E., Symans, M., Tian, J. and Dao, T. (2014), "Real-time hybrid simulation of a multi-story wood shear wall with first-story experimental substructure incorporating a rate-dependent seismic energy dissipation device", Smart Struct. Syst., 14(6), 1031-1054.
  18. Wang, S.J., Hwang, J.S., Chang, K.C., Shiau, C.Y., Lin, W.C., Tsai, M.S., Hong, J.X. and Yang, Y.H. (2014), "Sloped multiroller isolation devices for seismic protection of equipment and facilities", Earthq. Eng. Struct. D., 43(10),1443-1461.
  19. Wang, S.J., Yu, C.H., Lin, W.C., Hwang, J.S. and Chang, K.C. (2017), "A generalized analytical model for sloped rolling-type seismic isolators", Eng. Struct., 138, 434-446.
  20. Zhang, R., Phillips B.M., Taniguchi, S., Ikenaga, M. and Ikago, K. (2017) "Shake table real-time hybrid simulation techniques for the performance evaluation of buildings with inter-story isolation", Struct. Control Health Monit., 24(10), e1971.
  21. Zheng, L. and Li, Y.N. (2009), "Fuzzy-sliding mode control of a full car semi-active suspension systems with mr dampers", Smart Struct. Syst., 5(3), 261-277.