Model of the Shear Behavior of Unbonded Fiber-Reinforced Elastomeric Isolators
Publication: Journal of Structural Engineering
Volume 141, Issue 7
Abstract
In this paper, an analytical model is developed and used to predict the horizontal behavior of unbonded fiber-reinforced elastomeric isolators (FREIs). An advantageous feature of unbonded FREIs is the ability to undergo rollover due to the lack of flexural rigidity of the reinforcement and the unbonded support conditions of the isolator. The rollover causes a characteristic softening, followed by stiffening, as the initially vertical faces of the isolator come into contact with the upper and lower supports—defined as full rollover. The force-displacement relationship is modeled by dividing the isolator into three sections: a central section, which experiences pure shear, and two rollover sections, which experiences combined shear and bending. The displacements of the rollover section are used to establish the curved deformed profile and predict full rollover. The model is evaluated with experimental data from four unbonded FREI designs. A parametric study is conducted to determine the influence of the aspect ratio and bending stiffness of the composite fiber reinforcement matrix on the horizontal force-displacement relationship.
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Acknowledgments
Financial support for this study was provided by the McMaster University Centre for Effective Design of Structures (CEDS) funded through the Ontario Research and Development Challenge Fund (ORDCF), as well as an Early Researcher Award (ERA) grant. Both are programs of the Ministry of Research and Innovation (MRI). Support was also provided through the Natural Sciences and Engineering Research Council (NSERC) of Canada. The support of a Vanier Canada Graduate Scholarship is also gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 7 • July 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 26, 2013
Accepted: May 29, 2014
Published online: Aug 11, 2014
Discussion open until: Jan 11, 2015
Published in print: Jul 1, 2015
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