Performance of tuned particle impact damper and tuned mass damper seismic control systems considering mainshock-aftershock

Generally, seismic structural design codes have been defined in accordance with a single shock or mainshock. Also, seismic control systems are usually designed and studied based on single events. considering that ground motions in seismic zones are not a single event and usually several remarkable aftershocks accompany a mainshock, the seismic behavior of controlled structures and performance of the seismic control systems are not clear under real seismic sequences. The current study investigates the seismic behavior of a 3D seismic controlled steel structure and the performance of the seismic control systems under seven real mainshock-aftershocks using non-linear implicit analysis. A tuned particle impact damper (TPID) was used that combines a passive TMD and a particle impact damper (PID) to increase efficiency and performance by working out-of-phase with the main structure and increasing energy absorption. The efficiency of the TPID and TMD seismic control systems was studied by comparing the seismic behavior of the TPID-controlled, TMD-controlled and uncontrolled structures under seismic sequences. The parameters of the frequency response, top-story maximum relative displacement, structural damage (residual displacement) and inter-story drift ratio were studied. Additionally, by considering the structural system as a closed adiabatic isolated system with ground motion energy as the only system input energy, the absorbed kinetic and potential (inelastic dissipated energy) energies in seismic control systems were calculated and compared. Results showed that both TPID and TMD seismic control systems are efficient under seismic sequences. But the TPID system is a more efficient seismic control system compared to the TMD system. Also, this case showed that because of the high performance of the TPID and TMD seismic controlled systems, unlike the moment-resisting uncontrolled structures, there is no need to consider seismic sequences in the design of TPID- and TMD-controlled structures.

Automated summary

Seismic structural design codes and seismic control systems have traditionally been based on single events, such as a mainshock. However, in reality, seismic zones experience multiple aftershocks along with the mainshock. This study investigates the seismic behavior of a 3D seismic controlled steel structure and the efficiency of seismic control systems under real mainshock-aftershock sequences. The results show that the tuned particle impact damper (TPID) system, which combines a passive tuned mass damper (TMD) and a particle impact damper (PID), is more efficient than the TMD system. Additionally, the high performance of TPID and TMD control systems eliminates the need to consider seismic sequences in their design.