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Implementation and Validation of a Numerical Model for Lead-Rubber Seismic Isolation Bearings

Published online by Cambridge University Press:  15 November 2017

T. Zhou ,
Y. F. Wu  and
A. Q. Li
T. Zhou
Affiliation:
School of Civil Engineering Southeast University Nanjing, China
Y. F. Wu
Affiliation:
School of Civil Engineering Southeast University Nanjing, China
A. Q. Li*
Affiliation:
School of Civil Engineering Southeast University Nanjing, China Beijing Advanced Innovation Center for Future Urban Design Beijing University of Civil Engineering and Architecture Beijing, China
*
*Corresponding author ([email protected])
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Abstract

This paper presents a numerical model for accurately representing the behaviors of lead-rubber bearings during earthquakes. This model, which is implemented in OpenSees as a user-defined element, accounts for the mechanical characteristics of bearings as follows: firstly, the bi-lateral interaction effect of hysteretic behaviors, as well as the variation in horizontal stiffness due to vertical load, is considered; secondly, the reduced vertical stiffness under large lateral displacement is incorporated by the piecewise linear formulation, and the linear reduction method is employed to determine the stability limit of bearings in the deformed configuration; furthermore, the cavitation and permanent damage effects in bearings are mathematically included. To validate the numerical model, simulation analyses are performed for a series of static and dynamic loading tests, and the numerical results show reasonable agreement with experimental ones, which indicates that the proposed model provides an effective tool for the failure mode analyses of bearings and the dynamic analyses of seismic isolated structures.

Keywords

Lead-rubber bearingsBidirectional interaction effectCritical loadTensile behavior
Type
Research Article
Information
Journal of Mechanics , Volume 35 , Issue 2 , April 2019 , pp. 153 - 165
Copyright
© The Society of Theoretical and Applied Mechanics 2017 

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References

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