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Study on Laminated Type Base Isolation Device Using Urethane Erastomer for Practical Application

[+] Author Affiliations
Kenta Ishihana, Kengo Goda, Shohei Omata

Ohtsu Chemical Co., LTD., Takaishi, Japan

Osamu Furuya

Tokyo City University, Setagaya, Japan

Paper No. PVP2015-45426, pp. V008T08A044; 6 pages
doi:10.1115/PVP2015-45426
From:
  • ASME 2015 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • Boston, Massachusetts, USA, July 19–23, 2015
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5703-8
  • Copyright © 2015 by ASME

abstract

Base isolation system will be aggressively applied to not only architectural and civil structures but also various structures, because the effectiveness on seismic safety had been demonstrated again in the Great East Japan Earthquake.

In this study, the research and development of laminated type base isolation device using urethane elastomer has been carried out to upgrade a seismic safety for various structures. The fundamental characteristics have been investigated from several loading test by using various experimental devices, and the design formula for the stiffness and equivalent damping coefficient is formulated as an approximate expression of mechanical characteristics until now. Moreover, the experimental examination for aged deterioration in the urethane material has been continuously carried out.

This paper summarizes the mechanical characteristics based on the loading test up to 500% shear strain using experimental specimen with 100×100 mm cross-sectional shape, base isolation effect from time response analysis using nonlinear element model of urethane elastomer and the accelerated aging test for verifying the aging of practical use.

Copyright © 2015 by ASME

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