| Vol. - No. | Vol.12 - No.1 |
|---|---|
| Date | Mar., 2023 |
| Title | E-Isolation : High-performance Dynamic Testing Installation for Seismic Isolation Bearings and Damping Devices |
| Author |
Yoshikazu Takahashi1+, Toru Takeuchi2, Shoichi Kishiki3, Yozo Shinozaki4, Masako Yoneda5, Koichi Kajiwara6, and Akira Wada7 |
| Institutions |
1Department of Civil and Earth Resources Engineering, Kyoto University, Nishikyo-ku, Kyoto, Japan, 615-8540 2Department of Architecture and Building Engineering, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-ku, Tokyo, Japan, 152-8550 3Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, Japan, 226-8503 4Taisei Corporation, 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo, Japan, 163-0606 5Department of Architecture and Building Engineering, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-ku, Tokyo, Japan, 152-8550 6E-Defense, National Research Institute for Earth Science and Disaster Resilience 7Tokyo Institute of Technology |
| Abstract |
Seismic isolation and vibration control techniques have been developed and put into practical use by challenging researchers and engineers worldwide since the latter half of the 20th century, and after more than 40 years, they are now used in thousands of buildings, private residences, highways in many seismic areas in the world. Seismic isolation and vibration control structures can keep the structures undamaged even in a major earthquake and realize continuous occupancy. This performance has come to be recognized not only by engineers but also by ordinary people, becoming indispensable for the formation of a resilient society. However, the dynamic characteristics of seismically isolated bearings, the key elements, are highly dependent on the size effect and rate-of-loading, especially under extreme loading conditions. Therefore, confirming the actual properties and performance of these bearings with full-scale specimens under prescribed dynamic loading protocols is essential. The number of testing facilities with such capacity is still limited and even though the existing labs in the US, China, Taiwan, Italy, etc. are conducting these tests, their dynamic loading test setups are subjected to friction generated by the large vertical loads and inertial force of the heavy table which affect the accuracy of measured forces. To solve this problem, the authors have proposed a direct reaction force measuring system that can eliminate the effects of friction and inertia forces, and a seismic isolation testing facility with the proposed system (E-isolation) will be completed on March 2023 in Japan. This test facility is designed to conduct not only dynamic loading tests of seismic isolation bearings and dampers but also to perform hybrid simulations of seismically isolated structures. In this paper, design details and the realization of this system into an actual dynamic testing facility are presented and the outcomes are discussed. |
| Keyword |
Seismic Isolation, Bearing, Dynamic test, Friction, Inertia force, Scale effect, E-Isolation |
| PP. | PP.93~105 |
| Paper File |
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