Stiffness Analysis of Fiber-Reinforced Elastomeric Isolators, PEER Report 2001-05


The reinforcing elements of multi-layer elastomeric isolation bearings, which are normally steel plates, are replaced by a fiber reinforcement. The fiber-reinforced isolator is significantly lighter and could lead to a much less labor-intensive manufacturing process. In contrast to the steel-reinforced islolator, which is assumed to be rigid both in extension and in flexure, the fiber-reinforced isolator is assumed flexible in extension, but completely without flexural rigidity. This report presents theoretical approaches for analyzing the compressive stiffness and bending stiffness of fiber-reinforced isolators having three types of geometry: infinitely long strip, rectangular and circular. The stiffness formulae of fiber-reinforced isolators are derived. The influence of fiber flexibility on the mechanical properties of fiber-reinforced isolators is studied, and it is shown that it should be possible to produce a fiber-reinforced isolator that equals the advantageous behavior of steel-reinforced isolator.

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Hsiang-Chuan Tsai
James M. Kelly
Publication date: 
April 3, 2001
Publication type: 
Technical Report
Tsai, H., & Kelly, J. M. (2001). Stiffness Analysis of Fiber-Reinforced Elastomeric Isolators, PEER Report 2001-05. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA.