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タイトル: | Experimental Study on Influence of Hardening of Isolator in Multiple Isolation Building |
著者: | Fujita, Kohei https://orcid.org/0000-0002-4292-6819 (unconfirmed) Miura, Toshiya Tsuji, Masaaki Takewaki, Izuru |
著者名の別形: | 藤田, 皓平 辻, 聖晃 竹脇, 出 |
キーワード: | base isolation multiple isolation hardening effect vibration test seismic suppression performance innovative base isolation |
発行日: | 24-Jun-2016 |
出版者: | Frontiers Media SA |
誌名: | Frontiers in Built Environment |
巻: | 2 |
論文番号: | 12 |
抄録: | An innovative multiple isolation building system is proposed, and the influence of hardening in seismic isolators on the response of a multiple isolation building is investigated by shaking table vibration tests for a scaled structural model. From the observation in recent earthquake disasters in far-fault ground motions, e.g., the 2011 off the Pacific coast of Tohoku earthquake, a significant concern is reminded that the long-period and long-duration ground excitation may cause severe damages to the existing base-isolated buildings. In order to enhance the seismic vibration suppression performance of these buildings, the multiple isolation structure has been developed recently as one of the innovative solutions. The multiple isolation structure is defined as a seismic-isolated building, which has multiple isolation stories by inserting supplemental isolators in the middle story in addition to the base. In this paper, the advantages of the proposed multiple isolation system subjected to an extremely strong far-field earthquake ground motion as the worst scenario are studied by the vibration test for a scaled model. In the scaled model, a non-linear restoring-force characteristic (hardening) is provided by the geometrical non-linearity, which can be realized by inserting linear springs in the direction perpendicular to the vibration direction. The influence of this hardening property on the structural responses is studied by comparing with the responses of the same model without hardening effect. In the comparison with the base-isolated building, the fundamental seismic vibration suppression performances are evaluated in terms of the transfer functions of both a multiple isolation system and a base isolation system to the base input by sweeping frequencies of stationary sine waves using a controllable compact shaking table. In the numerical simulations, the effect of the friction in the isolation layers is also investigated. |
著作権等: | © 2016 Fujita, Miura, Tsuji and Takewaki. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
URI: | http://hdl.handle.net/2433/216519 |
DOI(出版社版): | 10.3389/fbuil.2016.00012 |
出現コレクション: | 学術雑誌掲載論文等 |
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