Effects of Heating on the Behavior of Lead-Rubber Bearings. I: Theory
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Volume 135, Issue 12
Abstract
The energy dissipated per cycle and the characteristic strength of lead-rubber bearings reduce with increasing number of cycles as a result of heating of the lead core. The reduction is substantial depending on the geometric characteristics of the bearing and the speed of motion. This paper presents a theory that is capable of predicting the dependency on time of the characteristic strength and energy dissipated of lead-rubber bearings. The theory is based on predicting the temperature of the lead core and relating the temperature to the strength. A much simpler theory is also presented based on neglect of heat conduction through the steel shim and end plates of the bearing. The theory is useful in predicting the cyclic behavior of lead-rubber bearings for simplified analysis, in extrapolating experimental data from one scale to another and in developing models for dynamic response history analysis of seismically isolated structures that account for the time-dependent mechanical properties of the bearings. A companion paper presents results of eight tests of six lead-rubber bearings that provide verification of the theoretical solution.
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Acknowledgments
The writers gratefully acknowledge financial support provided by the Federal Highway Administration through contracts UNSPECIFIEDDTFH61-98-C-00094 and UNSPECIFIEDDTFH61-07-C-00020 and by the State of California Department of Transportation (Project UNSPECIFIED65A0174). The responsible contract officers were Dr. Phillip Yen and Dr. Allaoua Kartoum, respectively. The writers also acknowledge useful comments of the anonymous reviewers that resulted in many improvements in the paper.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 135 • Issue 12 • December 2009
Pages: 1440 - 1449
Copyright
© 2009 ASCE.
History
Received: May 29, 2008
Accepted: Apr 30, 2009
Published online: Nov 13, 2009
Published in print: Dec 2009
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