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Earthquakes and Structures
  Volume 19, Number 5, November 2020 , pages 395-409
DOI: https://doi.org/10.12989/eas.2020.19.5.395
 


Equivalent linear and bounding analyses of bilinear hysteretic isolation systems
Shiang-Jung Wang, Hsueh-Wen Lee, Chung-Han Yu, Cho-Yen Yang and Wang-Chuen Lin

 
Abstract
    With verifications through many relevant researches in the past few decades, adopting the equivalent lateral force procedure for designing seismically isolated structures as a preliminary or even final design approach has become considerably mature and publicly acceptable, especially for seismic isolation systems that mechanically exhibit bilinear hysteretic behavior. During the design procedure, in addition to a given seismic demand, structural designers still need to previously determine three parameters, such as mechanical properties of seismic isolation systems or design parameters and performance indices of seismically isolated structures. However, an arbitrary or improper selection of given parameters might cause diverse or even unacceptable design results, thus troubling structural designers very much. In this study, first, based on the criterion that at least either two design parameters or two performance indices of seismically isolated structures are decided previously, the rationality and applicability of design results obtained from different conditions are examined. Moreover, to consider variations of design parameters of seismically isolated structures attributed to uncertainties of mechanical properties of seismic isolation systems, one of the conditions is adopted to perform bounding analysis for seismic isolation design. The analysis results indicate that with a reasonable equivalent damping ratio designed, considering a specific variation for two design parameters (the effective stiffness and equivalent damping ratio) could present more conservative bounding design results (in terms of isolation displacement and acceleration transmissibility) than considering the same variation but for two mechanical properties (the characteristic strength and post-yield stiffness).
 
Key Words
    equivalent linear analysis; bounding analysis; bilinear hysteretic model; seismic isolation system; mechanical property; design parameter; performance index
 
Address
Shiang-Jung Wang, Hsueh-Wen Lee,Wang-Chuen Lin:Department of Civil and Construction Engineering, National Taiwan University of Science and Technology,
No.43, Sec.4, Keelung Rd., Taipei 106335, Taiwan
Chung-Han Yu, Cho-Yen Yang:National Center for Research on Earthquake Engineering, No.200, Sec.3, Xinhai Rd., Taipei 106219, Taiwan
 

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