Earthquakes and Structures

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Early adjusting damping force for sloped rolling-type seismic isolators based on earthquake early warning information

  • Hsu, Ting-Yu (Department of Civil and Construction Engineering, National Taiwan University of Science and Technology) ;
  • Huang, Chih-Hua (Department of Civil and Construction Engineering, National Taiwan University of Science and Technology) ;
  • Wang, Shiang-Jung (Department of Civil and Construction Engineering, National Taiwan University of Science and Technology)
  • Received : 2020.09.11
  • Accepted : 2020.12.28
  • Published : 2021.01.25
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Abstract

By means of installing sloped rolling-type seismic isolators (SRI), the horizontal acceleration transmitted to the to-be-protected object above can be effectively and significantly reduced under external disturbance. To prevent the maximum horizontal displacement response of SRI from reaching a threshold, designing large and conservative damping force for SRI might be required, which will also enlarge the transmitted acceleration response. In a word, when adopting seismic isolation, minimizing acceleration or displacement responses is always a trade-off. Therefore, this paper proposes that by exploiting the possible information provided by an earthquake early warning system, the damping force applied to SRI which can better control both acceleration and displacement responses might be determined in advance and accordingly adjusted in a semi-active control manner. By using a large number of ground motion records with peak ground acceleration not less than 80 gal, the numerical results present that the maximum horizontal displacement response of SRI is highly correlated with and proportional to some important parameters of input excitations, the velocity pulse energy rate and peak velocity in particular. A control law employing the basic form of hyperbolic tangent function and two objective functions are considered in this study for conceptually developing suitable control algorithms. Compared with the numerical results of simply designing a constant, large damping factor to prevent SRI from pounding, adopting the recommended control algorithms can have more than 60% reduction of acceleration responses in average under the excitations. More importantly, it is effective in reducing acceleration responses under approximately 98% of the excitations.

Keywords

Acknowledgement

This research was financially aided by the Ministry of Science and Technology, Taiwan under the grant No MOST 107-2625-M-011-003, and the Taiwan Building Technology Center from the Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education, Taiwan. The support is greatly acknowledged.

References

  1. Abdollahzadeh, G. and Darvishi, R. (2017), "Cyclic behavior of DCFP isolators with elliptical surfaces and different frictions", Struct. Eng. Mech., 64(6), 731-736. https://doi.org/10.12989/sem.2017.64.6.731.
  2. AC156 (2010), Acceptance criteria for seismic certification by shake-table testing of nonstructural components. ICC Evaluation Service LLC.
  3. Calabrese, A., Spizzuoco, M., Losanno, D. and Barjani, A. (2020), "Experimental and numerical investigation of wire rope devices in base isolation systems", Earthq. Struct., 18(3), 275-284. http://dx.doi.org/10.12989/eas.2020.18.3.275.
  4. Chen, P.C. and Wang, S.J. (2016), "Improved control performance of sloped rolling-type isolation devices using embedded electromagnets", Structural Control and Health Monitoring, 24(1), 1853. https://doi.org/10.1002/stc.1853.
  5. Chen, P.C., Hsu S.C., Zhong, Y.J. and Wang, S.J. (2019), "Realtime hybrid simulation of smart base-isolated raised floor systems for high-tech industry", Smart Struct. Syst., 23(1), 091-106. http://dx.doi.org/10.12989/sss.2019.23.1.091.
  6. Cui, S., Bruneau, M. and Constantinou, M.C. (2012), "Integrated design methodology for isolated floor systems in single-degreeof-freedom structural fuse systems", Report No. MCEER-12-004, Multidisciplinary Center for Earthquake Engineering Research, State University of New York at Buffalo, U.S.A.
  7. De Iuliis, M., Petti, L. and Palazzo, B. (2008), "Semi-active control of structures by using early warning seismic network information", Proceedings of the 4th European conference of structural control, St. Petersburg, Russia, September.
  8. Erdik, M., Fahjan, Y., Ozel, O., Alcik, H., Mert, A. and Gul, M. (2003), "Istanbul earthquake rapid response and the early warning system", Bull. Earthq. Eng., 1, 157-163. https://doi.org/10.1023/A:1024813612271.
  9. Festa, G., Zollo, A. and Lancieri, M. (2008), "Earthquake magnitude estimation from early radiated energy", Geophy. Res. Lett., 35(22), L22307. https://doi.org/10.1029/2008GL035576.
  10. Harvey Jr, P.S. and Gavin, H.P. (2014), "Double rolling isolation systems: a mathematical model and experimental validation", International Journal of Non-Linear Mechanics, 61, 80-92. https://doi.org/10.1016/j.ijnonlinmec.2014.01.011.
  11. Harvey Jr, P.S. and Kelly, K.C. (2016), "A review of rolling-type seismic isolation: historical development and future directions", Eng. Struct., 125, 521-531. https://doi.org/10.1016/j.engstruct.2016.07. 031.
  12. Harvey, Jr, P.S., Zéhil, G.P. and Gavin, H.P. (2014), "Experimental validation of a simplified model for rolling isolation systems", Earthq. Eng. Struct. Dyn., 43(7), 1067-1088. https://doi.org/10.1002/eqe.2387.
  13. Iervolino, I. (2011), "Performance-based earthquake early warning", Soil Dyn. Earthq. Eng., 31(2), 209-222. https://doi.org/10.1016/j.soildyn.2010.07.010.
  14. Iuliis, M.D. and Faella, C. (2013), "Effectiveness analysis of a semiactive base isolation strategy using information from an early-warning network", Eng. Struct., 52, 518-535. https://doi.org/10.1016/j.engstruct.2013.03.025.
  15. Jangid, R.S. and Londhe, Y.B. (1998), "Effectiveness of elliptical rolling rods for base isolation", J. Struct. Eng., ASCE, 124(4), 469-472. https://doi.org/10.1061/(ASCE)0733-9445(1998)124:4(469).
  16. Jia, G., Gidaris, I., Taflanidis, A.A. and Mavroeidis. (2014), "Reliability-based assessment/design of floor isolation systems", Eng. Struct., 78(1), 41-56. https://doi.org/10.1016/j.engstruct.2014.07.031.
  17. Kanda, K., Kobori, T., Ikeda, Y. and Koshida, H. (1994), "The development of a "pre-arrival transmission system for earthquake information" applied to seismic response controlled structures", Proceedings of the 1st World Conference on Structural Control, California, U.S.A, November, TA3, 23-32.
  18. Kasalanati, A., Reinhorn, A.M., Constantinou, M.C. and Sanders, D. (1997), "Experimental study of ball-in-cone isolation system", Proceedings of the ASCE Structures Congress XV, Portland, Oregon, U.S.A, April.
  19. Kobori, T. (2000), "Future perspective of structural control in earthquake engineering", Proceedings of the 12th World Conference on Earthquake Engineering, Auckland, New Zealand, January-February, 2841.
  20. Kumar, M., Whittaker, A.W. and Constantinou, M.C. (2015), "Characterizing friction in sliding isolation bearings", Earthq. Eng. Struct. Dyn., 44(9), 1409-1425. https://doi.org/10.1002/eqe.2524.
  21. Maddaloni, G., Caterino, N. and Occhiuzzi, A. (2011), "Semiactive control of the benchmark highway bridge based on seismic early warning systems", Bull. Earthq. Eng., 9, 1703. https://doi.org/10.1007/s10518-011-9259-1.
  22. Maddaloni, G., Caterino, N., Nestovito, G. and Occhiuzzi, A. (2013), "Use of seismic early warning information to calibrate variable dampers for structural control of a highway bridge: evaluation of the system robustness", Bull. Earthq. Eng., 11, 2407-2428. https://doi.org/10.1007/s10518-013-9510-z.
  23. Mahmood, H. and Amirhossein, S. (2011), "Using orthogonal pairs of rollers on concave beds (OPRCB) as a base isolation system - Part I: analytical, experimental and numerical studies of OPRCB isolators", Struct. Des. Tall Spec. Build., 20(8), 928-950. https://doi.org/10.1002/tal.568.
  24. Nuzzo, I., Caterino, N., Maddaloni, G. and Occhiuzzi, A. (2017), "Smart hybrid isolation of a case study highway bridge exploiting seismic early warning information", Eng. Struct., 147, 134-147. https://doi.org/10.1016/j.engstruct.2017.05.057.
  25. Pnevmatikos, N.G. and Gantes, C.J. (2007), "Pole selection for structural control using the complex Fourier characteristics of the incoming earthquake", Struct. Control Heal. Monit., 14(3), 428-447. https://doi.org/10.1002/stc.165.
  26. Pnevmatikos, N.G., Kallivokas, L.F. and Gantes, C.J. (2004), "Feed-forward control of active variable stiffness systems for mitigating seismic hazard in structures", Eng. Struct., 26(4), 471-483. https://doi.org/10.1016/j.engstruct.2003.11.003.
  27. Saha, A., Saha, P., Nestovito, G. and Patro, S.K. (2018), "Seismic protection of the benchmark highway bridge with passive hybrid control system", Earthq. Struct., 15(3), 227-241. http://dx.doi.org/10.12989/eas.2018.15.3.227.
  28. Shahbazi, P. and Taghikhany, T. (2017), "Sensitivity analysis of variable curvature friction pendulum isolator under near-fault ground motions", Smart Struct. Syst., 20(1), 23-33. https://doi.org/10.12989/sss.2017.20.1.023.
  29. Shahi, S.K. and Baker, J.W. (2014), "An efficient algorithm to identify strong-velocity pulses in multicomponent ground motions", Bull. Seismol. Soc. Amer., 104(5), 2456-2466. http://dx.doi.org/10.1785/0120130191.
  30. Vargas, R. and Bruneau, M. (2009), "Experimental response of buildings designed with metallic structural fuses II", J. Struct. Eng., ASCE, 135(4), 394-403. https://doi.org/10.1061/(ASCE)0733-9445(2009)135:4(394).
  31. 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. Dyn., 43(10), 1443-1461. https://doi.org/10.1002/eqe.2404.
  32. Wang, S.J., Sung, Y.L. and Hong, J.X. (2020), "Sloped rollingtype bearings designed with linearly variable damping force", Earthq. Struct., 19(2), 129-144. http://dx.doi.org/10.12989/eas.2020.19.2.129.
  33. Wang, S.J., Yu, C.H., Cho, C.Y. and Hwang, J.S. (2019), "Effects of design and seismic parameters on horizontal displacement responses of sloped rolling-type seismic isolators", Struct. Control Heal. Moni., 26(5), e2342. https://doi.org/10.1002/stc.2342.
  34. ang, 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. https://doi.org/10.1016/j.engstruct.2016.12.027.
  35. Wei, B., Wang, P., He, X., Zhang, Z. and Chen, L. (2017), "Effects of friction variability on a rolling-damper-spring isolation system", Earthq. Struct., 13(6), 551-559. https://doi.org/10.12989/eas.2017.13.6.551.
  36. Yurdakul, M. and Ates, S. (2018), "Stochastic responses of isolated bridge with triple concave friction pendulum bearing under spatially varying ground motion", Struct. Eng. Mech., 65(6), 771-784. https://doi.org/10.12989/sem.2018.65.6.771.
  37. Zhou, Q., Lu, X., Wang, Q., Feng, D. and Yao, Q. (1998), "Dynamic analysis on structures base isolated by a ball system with restoring property", Earthq. Eng. Struct. Dyn., 27(8), 773-791. https://doi.org/10.1002/(SICI)1096-9845(199808)27:8<773::AID-EQE749>3.0.CO;2-A.