Earthquakes and Structures

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Mathematical model and results for seismic responses of a nonlinear isolation system

  • Li, Shanshan (School of Civil Engineering, Central South University) ;
  • Xiang, Ping (School of Civil Engineering, Central South University) ;
  • Wei, Biao (School of Civil Engineering, Central South University) ;
  • Tan, Hao (School of Civil Engineering, Central South University) ;
  • Fu, Yunji (School of Civil Engineering, Central South University)
  • Received : 2019.10.05
  • Accepted : 2021.07.21
  • Published : 2021.09.25
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Abstract

The friction and viscous damping actions always cause nonlinear responses of a seismic isolation system under earthquakes. Their influence on the seismic responses needs investigation in detail. In order to analyze the effects of nonlinear phenomenon on the seismic isolation system, a mathematical model was built for such a nonlinear isolation system, and the nonlinear responses were calculated and analyzed. The numerical results indicate that an appropriate combination of spring, Coulomb friction and viscous damper is able to achieve an optimal seismic performance. The stiffness and natural period of system are significantly influenced by the friction action. Both the friction action and the viscous damping action can dissipate earthquake energy, and the optimal value of one depends on the value of the other in the seismic isolation system. All of the values of spring, Coulomb friction and viscous damper should be accurately evaluated before the design of seismic isolation system.

Keywords

Acknowledgement

This research is jointly supported by the National Natural Science Foundations of China under grant No. 51778635, U1934207 and 51978667, the Natural Science Foundations of Hunan Province under grant No. 2019JJ40386 and the Innovation-driven Plan in Central South University under grant No. 20200017050004. The above support is greatly appreciated.

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