RESEARCH ARTICLE


Dynamic Reliability Analysis of Mega-Sub Isolation System Under Random Ground Motion



Xiangxiu Li*, Xiaojun Li, Aiwen Liu, Qiumei He
Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China


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Creative Commons License
© 2017 Li et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Institute of Geophysics, China Earthquake Administration, Beijing 100081, China, Tel: (+86)15011253358, Fax: 010-68729388; E-mail: lixiangxiu1005@163.com


Abstract

Introduction:

The equation of motion of the mega-sub isolation system is derived in the present study. Then, the parameter optimization of the mega-sub isolation system is studied to illustrate the effects of the damping and stiffness of the isolation devices on the reliability of the system.

Methods:

Moreover, based on the first passage mechanism, the calculation procedure of the dynamic reliability of the system is presented. In this procedure, the story drift of the structure is used as the evaluation.

Results and Conclusion:

Numerical example shows that when the damping ratio of the isolation device is given, the overall reliability of the structure increases at first then decreases with increased frequency ratio, when the frequency ratio is constant, the overall reliability of the structure increases with increased damping ratio. In addition, compared to the aseismic system, the overall reliability of the mega-sub isolation system is significantly improved.

Keywords: Mega-sub isolation system, Random ground motion, Dynamic reliability, Parameter optimization, Frequency ratio, Aseismic system.