Earthquakes and Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Mechanical performance analysis of an electromagnetic friction pendulum system based on Maxwell's principle

  • Mao Weikang (School of Civil Engineering, Lanzhou University of Technology) ;
  • Li Xiaodong (School of Civil Engineering, Lanzhou University of Technology) ;
  • Chen Enliang (School of Civil Engineering, Lanzhou University of Technology)
  • Received : 2023.11.09
  • Accepted : 2024.06.11
  • Published : 2024.08.25
⟨ Previous Next ⟩

Abstract

Friction pendulums typically suffer from poor uplift-restraining. To improve the uplift-restraining and enhance the energy dissipation capacity, this article proposed a composite isolation device based on electromagnetic forces. The device was constructed based on a remote control system to achieve semi-active control of the composite isolation device. This article introduces the theory and design of an electromagnetic chuck-friction pendulum system (ECFPS) and derives the theoretical equation for the ECFPS based on Maxwell's electromagnetic attraction equation to construct the proposed model. By conducting 1:3 scale tests on the electromagnetic device, the gaps between the practical, theoretical, and simulation results were analyzed, and the accuracy and effectiveness of the theoretical equation for the ECFPS were investigated. The hysteresis and uplift-restraining performance of ECFPS were analyzed by adjusting the displacement amplitude, vertical load, and input current of the simulation model. The data obtained from the scale test were consistent with the theoretical and simulated data. Notably, the hysteresis area of the ECFPS was 35.11% larger than that of a conventional friction pendulum. Lastly, a six-story planar frame structure was established through SAP2000 for a time history analysis. The isolation performances of ECFPS and FPS were compared. The results revealed that, under horizontal seismic action, the horizontal seismic response of the bottom layer of the ECFPS isolation structure is greater than that of the FPS, the horizontal vibration response of the top layer of the ECFPS isolation structure is smaller than that of the FPS, and the axial force at the bottom of the columns of the ECFPS isolation structure is smaller than that of the FPS isolation structure. Therefore, the reliable uplift-restraining performance is facilitated by the electromagnetic force generated by the device.

Keywords

Acknowledgement

This work was supported partly by the National Natural Science Foundation of China (No. 51968043) and we would like to thank Editage (www.editage.cn) for English language editing.

References

  1. Cao, Y., Pan, P., Sun, J. and Wang, H. (2022), "Research on the mechanical performance and isolation effect of a disc spring single friction pendulum three-dimensional isolation device", J. Build. Struct., 43(7), 10. https://doi.org/10.14006/j.jzjgxb.2020.0721.
  2. Chen, X., Li, J., Li, Y. and Gu, X. (2016), "Lyapunov-based semi-active control of adaptive base isolation system employing magnetorheological elastomer base isolators", Earthq. Struct., 11(6), 1077-1099. https://doi.org/10.12989/eas.2016.11.6.1077.
  3. Dhaduk, R., Patel, V.B. and Panchal, V. (2021), "Seismic response of torsionally coupled building isolated with multiple-variable frequency pendulum isolator", Int. J. Adv. Res. Sci. Commun. Technol., 6(2), 1. https://doi.org/10.48175/ijarsct-1552.
  4. Ghodrati, A.G., Ayoub, S., Sajad, V. and Pejman, N. (2017), "Effect of seismic pounding on buildings isolated by triple friction pendulum bearing", Earthq. Struct., 12(1), 35-45. https://doi.org/10.12989/eas.2017.12.1.035.
  5. Ismagilov, T.Z. (2015). "Second order finite volume scheme for Maxwell's equations with discontinuous electromagnetic properties on unstructured meshes", J. Comput. Phys., 282, 33-42. https://doi.org/10.1016/j.jcp.2014.11.001.
  6. Karunaratne, N.P.K.V., Thambiratnam, D.P. and Perera, N.J. (2016), "Magneto-rheological and passive damper combinations for seismic mitigation of building structures", Earthq. Struct., 11(6), 1001-1025. https://doi.org/10.12989/eas.2016.11.6.1001.
  7. Khelifi, A. and Boujemaa, S. (2022), "Boundary layer method for solving full Maxwell equations in the presence of an electromagnetic inhomogeneity of small diameter", J. Math. Anal. Applicat., 505(2), 125584. https://doi.org/10.1016/j.jmaa.2021.125584.
  8. Kim, H.G., Yoshitomi, S., Tsuji, M. and Takewaki, I. (2012), "New three-layer-type hysteretic damper system and its damping capacity", Earthq. Struct., 3(6), 821-838. https://doi.org/10.12989/eas.2012.3.6.821.
  9. Oliveto, N.D. (2022), "Geometrically nonlinear analysis of friction pendulum systems under tri-directional excitation", Eng. Struct., 269, 114770. https://doi.org/10.1016/j.engstruct.2022.114770.
  10. Panchal, V.R. and Jangid, R.S. (2009), "Seismic response of structures with variable friction pendulum system", J. Earthq. Eng., 13(2), 193-216. https://doi.org/10.1080/13632460802597786.
  11. Soni, D.P., Mistry, B.B., Jangid, R.S. and Panchal, V.R. (2011), "Seismic response of the double variable frequency pendulum isolator", Struct. Control Health Monit., 18(4), 450-470. https://doi.org/10.1002/stc.384.
  12. Tsai, C.S., Chen, W.S., Chiang, T.C. and Chen, B.J. (2006), "Component and shaking table tests for full-scale multiple friction pendulum system", Earthq. Eng. Struct. Dyn., 35(13), 1653-1675. https://doi.org/10.1002/eqe.598.
  13. Xue, S., Pan, K. and Li, X. (2012), "Experimental study on the mechanical properties of vertical anti pull friction pendulum bearings", J. Civil Eng., 45(S2), 6-10. https://doi.org/10.15951/j.tmgcxb.2012.s2.028.
  14. Yang, T., Marafi, N.A., Calvi, P.M., Wiebe, R., Eberhard, M.O. and Berman, J.W. (2020), "Accounting for spectral shape in a simplified method of analyzing friction pendulum systems", Eng. Struct., 222, 111002. https://doi.org/10.1016/j.engstruct.2020.111002.
  15. Yu, Y., Royel, S., Li, J., Li, Y. and Ha, Q. (2016), "Magnetorheological elastomer base isolator for earthquake response mitigation on building structures: Modeling and second-order sliding mode control", Earthq. Struct., 11(6), 943-966. https://doi.org/10.12989/eas.2016.11.6.943.
  16. Zhang, F., Deng, J., Cao, S. and Dang, X. (2023), "Experimental and simulation studies of adaptive stiffness double friction pendulum bearing", Struct., 57, 105026. https://doi.org/10.1016/j.istruc.2023.105026.
  17. Zhao, G., He, H., Ma, Y. and Yang, H. (2023), "Seismic response analysis of a bridge with rotational mass friction damper and limited friction pendulum isolation", J. Civil Eng., 56(2), 1. https://doi.org/10.15951/j.tmgcxb.2022.0403.
  18. Zhuang, P., Sun, S. and Han, M. (2021), "Experimental study on the performance of SMA cable composite friction pendulum isolation support", J. Build. Struct., 42(S02). https://doi.org/10.14006/j.jzjgxb.2021.