Damping Performance Analysis of the Damped Outrigger System Based on H∞.

A cantilever beam with multiple rotation spring-dampers was utilized to simulate the damped outrigger system. Two new methods, namely, the "Maxwell dampers type method" and the "virtual small mass method," were proposed to present the simplified seismic response analysis of the damped outrigger system. Corresponding dynamic characteristic equations based on the proposed methods were also given. Subsequently, H ∞ performance index was employed to obtain the optimal damper parameters. The numerical analysis shows that the proposed methods agree well with the finite-element method and have relatively accurate results. Stiffness ratios of the perimeter columns have a significant effect on the pseudo frequencies and system damping ratios. Lower stiffness ratios of the perimeter columns commonly lead to higher pseudo frequencies and system damping ratios. Furthermore, the damped outrigger system has excellent seismic mitigation performance when applied with appropriate damping parameters based on H ∞ . [ABSTRACT FROM AUTHOR]