Shaking Table Test and Numerical Analysis of Tall Buildings Using a New Eddy-Current Tuned Mass Damper

Abstract eng:
Vibration control devices such as tuned mass dampers (TMDs), tuned liquid dampers (TLD) and other supplemental damping devices have been used to improve the vibration performance of tall buildings and proved quite economical and efficient. Due to Faraday’s Law of Induction and Lenz’s Law, a new application is created incorporating eddy current damping which consists of the permanent magnet and metal conductor into a large-scale, pendulum-based TMD in tall buildings to mitigate the structural vibration under wind or seismic scenarios. A shaking table test of a five-story steel frame with eddy-current TMD was performed and the results are presented to evaluate the earthquake-induced vibration control performance. The results indicate that the earthquake-induced acceleration and displacement response of the steel frame can be effectively reduced by the TMD. A 1000 ton eddy-current TMD was installed on the top of Shanghai Center Tower (SHC), a 632m-height building in China. Numerical analysis of the SHC structural model with the TMD was conducted and the results indicate that for SHC the eddy-current TMD was able to reduce wind-induced structural acceleration by 45%60% and earthquake-induced structural displacement by 5%-15%.

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