Modal decomposition of multi-degree-of-freedom structure with non-proportionally distributed rate-independent linear damping

• DOI: 10.1016/j.compstruc.2024.107316
• Publication Date: 2024-02-26T10:45:26Z
• Authors: Wei Liu; Kohju Ikago; Jiang Liu
• Keywords: Damping ratio; Spectral acceleration; Damping torque

Rate-independent linear damping benefits low-frequency structures by mitigating excessive displacement without increasing the floor acceleration response under severe ground motions. The advantage of rate-independent in controlling is attributed to its constant loss stiffness, which ensures high components while maintaining low high-frequency forces. In this study, a modal decomposition method was developed for base-isolated structure containing distributed non-proportionally stiffness. Because single-degree-of-freedom system can be well-approximated viscous having same eigenvalues, behavior evaluated via response-spectrum approach. proposed analysis method, separated responses were employed demonstrate how achieve control effect similar that with response. Compared conventional frequency analyses, found accurately predict dynamic system.