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K. Ikago¹, M. Ikenaga², S. Nakaminami³, K. Saito⁴ and N. Inoue⁵

¹International Research Institute of Disaster Science, Tohoku University, Sendai, Japan
²Graduate School of Engineering, Tohoku University, Sendai, Japan
³Aseismic Devices Co., Ltd., Tokyo, Japan
⁴NTT Facilities Research Institute Inc., Tokyo Japan
⁵Tohoku University, Sendai, Japan

Keywords: inerter, rotary inertial damper, viscous mass damper, seismic isolation, buffer spring, force limiter..

Summary

The inerter, which brought about new response control strategies for civil engineering structures, is a mechanical device that generates an inertial resistance force proportional to the relative accelerations between its two nodes.

One of the most viable ways to implement the idea of the inerter is to utilize a ball screw mechanism; indeed, rotary inertial dampers for seismic control and seismic isolation having apparent masses of 5,400 and 1,250T, respectively, have been successfully developed in Japan.

Although incorporating a rotary inertial damper is effective for reducing relative displacements, it induces high floor response accelerations, which transmit ground accelerations directly to the superstructure. To mitigate the floor response accelerations without deteriorating the reduction of relative displacements, incorporation of a damping force restriction and buffer spring is proposed.

This paper reports the results of shake table tests on a small-scale, base-isolated specimen containing an inerter-like device, namely, a force-restricted viscous mass damper, with the aims to validate the analytical methods and to confirm the effectiveness of the force restriction and buffer spring in reducing floor response accelerations.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 106 PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: Paper 54 Shake Table Tests for a Base-Isolated System Containing a Rotary Inertial Damper K. Ikago¹, M. Ikenaga², S. Nakaminami³, K. Saito⁴ and N. Inoue⁵ ¹International Research Institute of Disaster Science, Tohoku University, Sendai, Japan ²Graduate School of Engineering, Tohoku University, Sendai, Japan ³Aseismic Devices Co., Ltd., Tokyo, Japan ⁴NTT Facilities Research Institute Inc., Tokyo Japan ⁵Tohoku University, Sendai, Japan doi:10.4203/ccp.106.54 purchase the full-text of this paper Full Bibliographic Reference for this paper K. Ikago, M. Ikenaga, S. Nakaminami, K. Saito, N. Inoue, "Shake Table Tests for a Base-Isolated System Containing a Rotary Inertial Damper", in , (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 54, 2014. doi:10.4203/ccp.106.54 Keywords: inerter, rotary inertial damper, viscous mass damper, seismic isolation, buffer spring, force limiter.. Summary The inerter, which brought about new response control strategies for civil engineering structures, is a mechanical device that generates an inertial resistance force proportional to the relative accelerations between its two nodes. One of the most viable ways to implement the idea of the inerter is to utilize a ball screw mechanism; indeed, rotary inertial dampers for seismic control and seismic isolation having apparent masses of 5,400 and 1,250T, respectively, have been successfully developed in Japan. Although incorporating a rotary inertial damper is effective for reducing relative displacements, it induces high floor response accelerations, which transmit ground accelerations directly to the superstructure. To mitigate the floor response accelerations without deteriorating the reduction of relative displacements, incorporation of a damping force restriction and buffer spring is proposed. This paper reports the results of shake table tests on a small-scale, base-isolated specimen containing an inerter-like device, namely, a force-restricted viscous mass damper, with the aims to validate the analytical methods and to confirm the effectiveness of the force restriction and buffer spring in reducing floor response accelerations. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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