Probability Distribution Characteristics and Statistical Parameters of the Horizontal Stiffness of Rubber Isolation Bearings

The manufacturing of rubber bearing is complicated, the horizontal stiffness of the final product maybe greatly affected by the uncertainties during the processing, thus, it is necessary to study the distribution characteristics of the rubber bearings' horizontal stiffness, and its influence on...

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Bibliographic Details
Published in:Journal of earthquake engineering : JEE 2022-04, Vol.26 (5), p.2437-2449
Main Authors: Zhang, Ruijun, Li, Aiqun
Format: Article
Language:English
Subjects:
Bearings
Building design
Damping
Distribution
Equivalence
horizontal stiffness
Optimization
Probability distribution
Probability theory
Rubber
Rubber isolation bearing
rubber layer
Rubber layers
Seismic activity
Seismic design
Seismic isolation
Seismic response
Shear
Shear stiffness
Statistical analysis
Statistical methods
Statistics
Thickness
Variation
Vulcanization
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Summary:The manufacturing of rubber bearing is complicated, the horizontal stiffness of the final product maybe greatly affected by the uncertainties during the processing, thus, it is necessary to study the distribution characteristics of the rubber bearings' horizontal stiffness, and its influence on the seismic performance of the isolation structure. The rubber layer thickness was taken as a comprehensive index, measurements were carried out before and after vulcanization, the relationship between the rubber layer thickness and the variation of bearing's horizontal stiffness was deduced, and an optimization method to reduce the variation of bearing stiffness was proposed. Then, based on the equivalent shear stiffness samples of 224 rubber bearings of 3 different specifications produced by two manufacturers, systematic statistical analysis and probability distribution tests were carried out. Result shown that the equivalent shear stiffness obeys the I-type minimum-value distribution. Finally, the influence of the variation of the bearing's stiffness on the seismic performance of the rubber bearing isolation structure was studied. The results shown that the probability distribution form of the rubber bearings stiffness has a certain influence on the adjustment coefficient of the isolation structure, but the damping effect of the isolation structure still has sufficient safety reserve according to China's Code for Seismic Design of Buildings.
ISSN:1363-2469
1559-808X
DOI:10.1080/13632469.2020.1762806