doi:10.3850/978-981-08-7920-4_S2-S66-cd
Finding Optimal Locations of Dampers in Active Controlled Structures Subjected to Earthquakes
Y. Ribakov1 and G. Agranovich2
1Department of Civil Engineering, Ariel University Center of Samaria, Israel.
2Department of Electrical Engineering and Electronics,
Ariel University Center of Samaria, Ariel, Israel.
ABSTRACT
Using active dampers for improving structural behavior under earthquakes was widely investigated
during the recent years. It was shown that active dampers are very effective and yield
significant reductions in response of structures to earthquakes. An important economical issue
in design of structures with active control systems is how many dampers should be used.
The cost of the control system usually depends on the number and price of a damping unit
and its connection to the frame and energy required for activation of the control system to
realize the optimal control algorithm. A solution of this problem was proposed by the authors
previously. It is based on the modified LQG design of active dampers located at each floor with
restrictions of the peak control forces. Energy, dissipated in the dampers, is obtained and most
effective dampers’ locations are selected according to maximum contribution to the total energy
dissipation. This study shows how effective is a limited set of dampers, compared to a full set,
when devices are located at all floors. Effectiveness of the proposed method is demonstrated in
numerical example. Response of the structures was obtained for full and limited sets of dampers.
A criterion, demonstrating the efficiency of a control system with limited set of dampers is
proposed. The results of this study form a way for selection of number of dampers and their
location allowing effective improvement of structural seismic response.
Keywords: Structural control, Seismic response, Active dampers, Limited set of dampers, Dampers location.
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