SEISMIC CONTROL OF BUILDINGS USING NONLINEAR ENERGY SINK DEVICES WITH ROTATIONAL COMPONENTS
Journal
World Conference on Earthquake Engineering proceedings
Journal Volume
2024
ISSN
30065933
Date Issued
2024
Author(s)
Kao T.L.
Abstract
Mass dampers are a widely accepted control technique for seismically-excited tall buildings. When these mass dampers are optimally tuned to the primary natural frequencies of buildings, the structural responses (i.e., floor displacements and accelerations) can be effectively mitigated. However, the tuned mass dampers may introduce a large displacement when buildings are subjected to intensive earthquake loadings. To address this shortcoming, some researchers suggested adding nonlinear restoring forces to mass dampers, such as forming a track nonlinear energy sink. Still, a sufficiently large mass in this nonlinear mass damper is a critical issue. Therefore, this research develops a track nonlinear energy sink with a mass moment of inertia. The proposed mass damper has not only the feature of nonlinear restoring forces but also increased effective mass by rotational components. In this study, the equation of motion for a building with the proposed mass damper is derived. A design method based on the frequency-domain input-output relationship is established. To further verify the damper performance, a prototype track nonlinear energy sink with a mass moment of inertia is fabricated and experimentally evaluated by real-time hybrid simulation. As seen in the experimental results, the proposed mass damper outperforms the conventional track nonlinear energy sink. Moreover, only adequately effective mass, i.e., sufficient momentum to maintain static friction, is feasible to generate control performance against input ground motion.
Publisher
International Association for Earthquake Engineering
Type
conference paper