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Dynamic Characteristics of Seismic Isolation with Quasi-Zero Stiffness, Rotational Inertia
Conventional seismic isolation reduces acceleration and structural damage. However, there is a trade-off between displacement and acceleration. Thus, seismically isolated layer may pound against moat walls when a large earthquake occurs. To address the above problem, we developed a displacement control system (DCS) in previous study. DCS is a seismically isolation system with quasi-zero stiffness (QZS) and rotational inertia. A QZS device is used to improve the control performance of seismically isolation system. However, if the dominant frequency of the input wave varies from low to high, a seismically isolation system with a QZS device causes nonlinear resonance and drastically degrades in control performance. Rotational inertia, however, elongates the natural period and prevents the nonlinear resonance caused by QZS. This study evaluated the steady-state response of our DCS subjected to harmonic excitation through analysis and shaking table tests. The response of DCS to seismic excitation was also investigated through shaking table tests. Comparing the analytical solutions and the test results showed that the analytical solutions agree well with the test results in terms of the frequency-amplitude relationship. The test results of seismic wave excitation indicate that our DCS suppresses the maximum response displacement within the seismic gap.
Dynamic Characteristics of Seismic Isolation with Quasi-Zero Stiffness, Rotational Inertia
Conventional seismic isolation reduces acceleration and structural damage. However, there is a trade-off between displacement and acceleration. Thus, seismically isolated layer may pound against moat walls when a large earthquake occurs. To address the above problem, we developed a displacement control system (DCS) in previous study. DCS is a seismically isolation system with quasi-zero stiffness (QZS) and rotational inertia. A QZS device is used to improve the control performance of seismically isolation system. However, if the dominant frequency of the input wave varies from low to high, a seismically isolation system with a QZS device causes nonlinear resonance and drastically degrades in control performance. Rotational inertia, however, elongates the natural period and prevents the nonlinear resonance caused by QZS. This study evaluated the steady-state response of our DCS subjected to harmonic excitation through analysis and shaking table tests. The response of DCS to seismic excitation was also investigated through shaking table tests. Comparing the analytical solutions and the test results showed that the analytical solutions agree well with the test results in terms of the frequency-amplitude relationship. The test results of seismic wave excitation indicate that our DCS suppresses the maximum response displacement within the seismic gap.
Dynamic Characteristics of Seismic Isolation with Quasi-Zero Stiffness, Rotational Inertia
Lecture Notes in Civil Engineering
Sadan, Bahadir (Herausgeber:in) / Tuzun, Cuneyt (Herausgeber:in) / Erdik, Mustafa (Herausgeber:in) / Iba, Jun (Autor:in) / Watanabe, Koichi (Autor:in) / Miyamoto, Kou (Autor:in) / Ishii, Ken (Autor:in) / Kikuchi, Masaru (Autor:in)
World Conference on Seismic Isolation ; 2023 ; Antalya, Türkiye
Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures ; Kapitel: 1 ; 3-14
29.09.2024
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Seismic isolation , Displacement control system , Quasi-zero stiffness , Rotational inertia Engineering , Geoengineering, Foundations, Hydraulics , Geotechnical Engineering & Applied Earth Sciences , Fire Science, Hazard Control, Building Safety , Building Construction and Design , Cultural Heritage
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