Characterization and performance evaluation of a vertical seismic isolator using link and crank mechanism

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Tsujiuchi, N.^1 ; Ito, A.^1 ; Sekiya, Y.^1 ; Nan, C.^1 ; Yasuda, M.^2

Doshisha University, Dept. of Mechanical Engineering, Tataramiyakodanil-3, Kyoto, Kyotanabeshi

610-0394, Japan^1

Setsunan University, Dept. of Mechanical Engineering, Ikedanakamachi 17-8, Osaka, Neyagawashi

572-8508, Japan^2

关键词: Chuetsu earthquake;    Earthquake damages;    Experimental values;    Frequency characteristic;    Height characteristic;    Performance evaluations;    Theoretical values;    Vertical vibrations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012232/pdf
DOI  :  10.1088/1742-6596/744/1/012232

来源: IOP

【 摘 要 】

In recent years, various seismic isolators have been developed to prevent earthquake damage to valuable art and other rare objects. Many seismic isolators only defend against horizontal motions, which are the usual cause of falling objects. However, the development of a seismic isolator designed for vertical vibration is necessary since such great vertical vibration earthquakes as the 2004 Niigata Prefecture Chuetsu Earthquake have occurred, and their increased height characteristics are undesirable. In this study, we developed a vertical seismic isolator that can be installed at a lower height and can support loads using a horizontal spring without requiring a vertical spring. It has a mechanism that combines links and cranks. The dynamic model was proposed and the frequency characteristics were simulated when the sine waves were the input. Shaking tests were also performed. The experimental value of the natural frequency was 0.57 Hz, and the theoretical values of the frequency characteristics were close to the experimental values. In addition, we verified this vertical seismic isolator's performance through shaking tests and simulation for typical seismic waves in Japan. We verified the seismic isolation's performance from the experimental result because the average reduction rate of the acceleration was 0.21.