Effects of Heating on the Behavior of Lead-Rubber Bearings. II: Verification of 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. A theory which is capable of predicting the histories of temperature rise in the core, of the energy dissipated and of the characteristic strength of lead-rubber bearings has been presented in a companion paper. This paper presents a comparison of predictions of this theory to experimental results obtained in the testing of six lead-rubber bearings. The analytical predictions are found to be sufficiently accurate. Moreover, finite-element analyses results are presented that provide insight into the distribution of temperature in the lead core and end and shim plates of the bearings. These distributions confirm the assumptions made in the development of the theoretical solution.
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Acknowledgments
The writers gratefully acknowledge financial support provided by the Federal Highway Administration (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 Dr. Amarnath Kasalanati of Dynamic Isolation Systems (DIS), Inc. for information on lead-rubber bearing construction and behavior. The bearing of Example 1 was manufactured by Scougal Rubber and tested at the Rocketdyne Division of Boeing in Calif. The bearing of Example 2 was manufactured by Seismic Energy Products and tested at the University at Buffalo (UB). The bearing of examples 3 and 4 was manufactured by DIS and tested at the SRMD facility of the University of California, San Diego (UCSD). The bearing of Example 5 was manufactured by DIS and tested at UB. The bearing of Example 6 was manufactured by DIS and tested at the SRMD facility of UCSD. The bearing of examples 7 and 8 was manufactured by Scougal Rubber and tested at UB. The writers acknowledge useful comments of the anonymous reviewers that resulted in many improvements in the paper.
References
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 135 • Issue 12 • December 2009
Pages: 1450 - 1461
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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