Experimental Investigation and Seismic Performance Evaluation of the Combined Outrigger and Multilayer Amplified Viscous Damped Substructure System

ABSTRACT This paper proposes a combined outrigger and multilayer amplified viscous damped substructure system (COMAVDSS). First, a simplified analysis model for the COMAVDSS was established, and the mechanical models of the single‐layer amplified viscous damper (SAVD) and multilayer amplified viscous damper (MAVD) were derived. Subsequently, the theoretical predictions were compared with the experimental results to validate the mechanical model. Finally, to evaluate the vibration control capability of COMAVDSS, a high‐rise structure was numerically simulated. The deviation between the test and theoretical values of damping force and energy dissipation under different loading displacements is within ±15%. Compared with the viscous damper (VD), the maximum damping force of SAVD and MAVD increased by 380% and 883%, respectively. Compared with the combined outrigger substructure system (COSS), the top displacement RMS of the combined outrigger and viscous damped substructure system (COVDSS), the combined outrigger and single‐layer amplified damped substructure system (COSAVDSS), and COMAVDSS are reduced by 11.76%, 30.66%, and 55.13%, respectively. Compared with the COVDSS, COSAVDSS and COMAVDSS increase the damper energy dissipation by 42% and 58%, respectively. The COMAVDSS utilizes the relative displacement difference between the main structure and substructure and the damping amplification mechanism to improve the energy dissipation efficiency.