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SUMMARY The Shanghai World Financial Center Tower is the tallest landmark building in mainland China, with a height of 492 m. In order to mitigate wind-induced vibration, a set of two identical damping devices was installed at the 90th floor. The damping devices are active tuned mass dampers: under wind loading, the active control feature is enabled, while the active control feature becomes disabled under earthquake conditions, and the damping devices function as passive tuned mass dampers. The dynamic parameters of the damping devices, structural analysis results and field measurement results under different vibration scenarios are presented in this paper. The analysis and field measurement results show that the damping devices performed well and had the following characteristics: they increased the damping ratio up to eight times in field measurements and reduced the wind acceleration response up to 60% when wind speed is below the designed value in the analysis. Copyright © 2012 John Wiley & Sons, Ltd.

Summary Structure-soil-structure interaction (SSSI) phenomena under earthquake excitations are investigated in this paper. Based on the results of the shaking table test, this work presents a 3-dimensional finite element numerical simulation method using ANSYS software. In the simulation, an equivalent linear model is assumed for soil behavior, and contact elements are adopted to consider the nonlinearity state of the interface between foundation and surrounding soil. In addition, constrained equations are added to manage the uncoordinated degrees of freedom. By comparing the results of the finite element analysis with data obtained from the shaking table test, the dynamic response of the shaking table test can be simulated properly. Finally, the dynamic response of adjacent structures considering the SSSI effect is analyzed. The results show that with increased excitation, contact pressure, strain amplitude, and pile slip increase, whereas the peak acceleration magnification coefficient decreases. These results are significant for studying the effect of SSSI on seismic responses of structures.