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Effects of shear keys on seismic performance of an isolation system

  • Wei, Biao (School of Civil Engineering, Central South University) ;
  • Li, Chaobin (School of Civil Engineering, Central South University) ;
  • Jia, Xiaolong (School of Civil Engineering, Central South University) ;
  • He, Xuhui (School of Civil Engineering, Central South University) ;
  • Yang, Menggang (School of Civil Engineering, Central South University)
  • Received : 2019.01.12
  • Accepted : 2019.04.26
  • Published : 2019.09.25
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Abstract

The shear keys are set in a seismic isolation system to resist the long-term service loadings, and are cut off to isolate the earthquakes. This paper investigated the influence of shear keys on the seismic performance of a vertical spring-viscous damper-concave Coulomb friction isolation system by an incremental dynamic analysis (IDA) and a performance-based assessment. Results show that the cutting off process of shear keys should be simulated in a numerical analysis to accurately predict the seismic responses of isolation system. Ignoring the cutting off process of shear keys usually leads to untrue seismic responses in a numerical analysis, and many of them are unsafe for the design of isolated structure. And those errors will be increased by increasing the cutting off force of shear keys and decreasing the spring constant of shear keys, especially under a feeble earthquake. The viscous damping action postpones the cutting off time of shear keys during earthquakes, and reduces the seismic isolation efficiency. However, this point can be improved by increasing the spring constant of shear keys.

Keywords

Acknowledgement

Supported by : National Natural Science Foundations of China, Natural Science Foundations of Hunan Province

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