Hybrid Earthquake Loading Tests of Various Types of Base Isolation Bearings

  • H. Iemura
Part of the CISM International Centre for Mechanical Sciences book series (CISM, volume 345)


Under a joint research program between Kyoto University and the Hanshin Expressway Public Corporation, five isolation bearings of different damping mechanisms were tested under identical test conditions in order to evaluate their suitability and applicability to different types of bridges. The isolation bearings, including the lead-rubber bearing, two types of high-damping rubber bearings, sliding rubber bearing, and a conventional rubber bearing were tested under cyclic loading and hybrid earthquake (pseudo-dynamic) test methods. In addition to the fundamental cyclic load-deformation behavior, earthquake and resonant response behavior of the five isolation bearings were obtained. From the test results, equivalent damping ratios are evaluated based on the usual cyclic loading tests as well as from earthquake response of equivalent linear elastic models. In addition, the effectiveness of isolation is evaluated based on acceleration and displacement amplifications using earthquake response results obtained from the hybrid earthquake loading tests. In order to evaluate the effect of initial first-cycle stiffness of rubber bearings on the earthquake response, a second identical specimen of each type of isolation bearings was tested for its virgin earthquake response behavior.


Seismic Isolation Base Isolation Rubber Bearing Earthquake Response Isolation Device 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. I. Buckle, R. Mayes [1990]: “Seismic Isolation: History, Application, and Performance — A World View,” Earthquake Spectra, Vol. 6, No. 2, 161–201.CrossRefGoogle Scholar
  2. Disaster Prevention Research Council (DPRC) [1992]: “Investigative Research on Seismic Isolation Design of Highway Bridges,” Report submitted by the Earthquake Engineering Laboratory, Dept. of Civil Engg., Kyoto University to the Hanshin Expressway Public Corporation (in Japanese).Google Scholar
  3. H. Iemura, Y. Yamada, W. Tanzo, Y. Uno, S. Nakamura [1991]: “On-line Earthquake Response Tests of High-Damping Rubber Bearings for Seismic Isolation,” 1st US-Japan Workshop on Earthquake Protective Systems for Bridges, Buffalo, New York, Sept.Google Scholar
  4. M. Izumi [1988]: “State-of-the-Art Report on Base Isolation and Passive Seismic Response Control,” ProC., 9th WCEE, Tokyo-Kyoto.Google Scholar
  5. Japan Road Association [1990]: Specifications for Highway Bridges, Part V — Seismic Design (in Japanese).Google Scholar
  6. J. Kelly [1986]: “Aseismic Base Isolation: Review and Bibliography, Soil Dynamics and Earthquake Engineering, Vol. 5, No. 3.Google Scholar
  7. PWRI [1991, 1990]: “Report of Joint Research Between PWRI and 28 Private Firms on Development of Menshin Devices for Highway Bridges,” Technical Report of Cooperative Research, No. 44 and No. 60, Public Work Research Institute.Google Scholar
  8. W. Tanzo, Y. Yamada, H. Iemura [1992]: “Substructured Computer-Actuator Hybrid Loading Tests for Inelastic Earthquake Response of Structures,” Research Report 92-ST-01, Kyoto University, January.Google Scholar

Copyright information

© Springer-Verlag Wien 1994

Authors and Affiliations

  • H. Iemura
    • 1
  1. 1.Kyoto UniversityKyotoJapan

Personalised recommendations