Investigation Into Vibration Control Effect of Track Nonlinear Energy Sink Attached on a Frame Building

Abstract eng:
Nonlinear energy sinks (NES) are efficient vibration control devices. Its application has been studied in mechanical, automobile and aerospace engineering and made some achievements. However, there are little applications in civil engineering. To validate its vibration control effects on building structures, a series of shaking table tests were conducted on a five-story steel frame which is five meters high and six tons weight. Track of the NES were installed on the roof of the frame with rigid connections and mass of the NES was constrained to slide along the track through use of wheels which were made of either steel or rubber. Five earthquake waves with different frequency spectrums were selected to excite the frame coupled with NES under minor, moderate and major levels. Accelerations and displacements on each story of the frame were measured, recorded and evaluated. The experimental results demonstrate that with small mass ratio (2%) of main structure, NES has good performance in reducing the dynamic responses of the frame under seismic excitations. In the time domain analysis, it is shown that NES can attenuate the displacements, accelerations and RMS of the frame. NES exhibits wide-band frequency vibration controlling attributes that responses of the frame are reduced in multiple vibration modes after the acceleration response data were processed in the frequency domain. Comparisons of vibration reduction capability are made between NES with steel wheels and rubber wheels, and it is verified that different damping of NES makes a difference to the effect of vibration control.

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