Optimal design and test of periodic foundation

SUN Feifei1,2,YANG Jiaqi1,XIAO Lei1

Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (12) : 1-8.

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PDF(1793 KB)
Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (12) : 1-8.

Optimal design and test of periodic foundation

  • SUN Feifei1,2,YANG Jiaqi1,XIAO Lei1
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Abstract

The idea of employing periodic foundations (PFs) to mitigate seismic damage to superstructure relies on attenuating seismic waves’ energy around the superstructure’s Eigenfrequency. The seismic mitigation performance of PFs depends on several aspects, including the tuning frequency ratio of inner resonators and their mass ratios and damping ratios. The stiffness of host material, the reaction of superstructures and frequency components of seismic waves also influence the performance of PFs. An optimization design method based on the average reduction of peak responses of a superstructure under excitations of several selected seismic waves is proposed. The result indicates that the peak responses of the superstructure under 44 selected seismic waves are averagely reduced by 30% by the optimal PF. Parametric studies indicate that the performance of the optimal PF is robust concerning to parameter deviations. The effectiveness of the design method was proved by a small scaled shaking table test.

Key words

Periodic foundation / Attenuation zone / Seismic isolation / Optimization

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SUN Feifei1,2,YANG Jiaqi1,XIAO Lei1. Optimal design and test of periodic foundation[J]. Journal of Vibration and Shock, 2020, 39(12): 1-8

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