The corresponding frequency response of the model loaded by wind in the x-direction is shown in Fig. 4. It can be seen that with dampers the fundamental frequencies increase due to an increase of the frame stiffness caused by the dampers. Time series of acceleration of the type shown in Fig. 5 are used to determine overall damping ratios by the log-decrement method. Initial findings show that all three types of dampers are effective in reducing the wind response of the model structure. The viscoelastic dampers not only provide additional damping but also increase stiffness of the structure.
Study continues to investigate optimization of damping with a minimum number of dampers.