Abstract Summary
The dynamic performance evaluation of two adjacent single-degree-of-freedom structures (SDOF) connected with novel negative stiffness-inerter-based dampers (NSIDs) is studied under base excitation. The base excitation is modelled as a stationary white noise random process. The equations of motion are written in state space form, and optimal parameters for maximum possible response reduction are evaluated. The optimal parameters are based on minimising the mean square response of relative displacement under white noise base excitations. The performance of optimised dampers connecting adjacent SDOF systems is then assessed under real earthquake records. The seismic response reduction of adjacent structures with NSIDs is compared with viscous dampers with the same damping coefficient. Numerical results indicate comprehensive seismic response reduction of both the connected structures when NSIDs are used as connecting systems compared to viscous connections. The analytical study demonstrates that the performance of viscous dampers can be enhanced by adding the negative stiffness and inerter elements to the dashpot.
