Performance improvement and demand-oriented optimum design of the tuned negative stiffness inerter damper for base-isolated structures. (1st January 2023)

• Record Type: Journal Article
• Authors: Gao, Hui; Xing, Chenxi; Wang, Hao; Li, Jian; Zhang, Yang
• Is Part Of: Journal of building engineering. Volume 63(2023)Part A
• Publication Date: 2023-01-01
• Subjects: Base isolation -- Negative stiffness damper -- Inerter based damper -- Performance improvement -- Demand-oriented optimum design; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2022.105488
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: Base isolation is an effective earthquake protection strategy for building structures. However, the base-isolation floor may undergo large displacements under earthquake excitations. To improve the control performance of base isolation, a tuned negative stiffness inerter damper (TNSID) is proposed for base-isolated structures (BIS). The TNSID is evolved from the tuned inerter damper (TID), while adding a negative stiffness element (NS) paralleled with the inerter in the TID. Hence, the TNSID is expected to take advantages of the dual beneficial effects of the inerter and NS for structural control. Based on the simplified analytical model of the BIS, the damping enhancement equation and energy balance equation of the BIS-TNSID system are derived. On this basis, the effects of the inerter and NS of the TNSID on displacement mitigation, damping enhancement, and energy reduction of the BIS are investigated. The benefit of the tuned effect of the TNSID is also illustrated. To balance the control performance and design cost, a demand-oriented optimum design method of the TNSID for the BIS is developed and extended to the MDOF structures. In addition, the effectiveness of the TNSID is examined through a design case when the BIS is subjected to stationary random and earthquake excitations. The results demonstrate the advantage of the TNSID for BIS compared with the TID, negative stiffness inerter damper, and tuned negative stiffness viscous mass damper. Highlights: The tuned negative stiffness inerter damper (TNSID) is proposed earthquake protection of base-isolated structures (BIS). The displacement mitigation, damping enhancement and energy dissipation mechanism of the BIS with TNSID are demonstrated. The demand-oriented optimum design method for the TNSID is proposed to consider the balance of design demands and cost. The benefits of the TNSID for the protection of BIS are illustrated under stationary random and earthquake excitations.