Journal
JOURNAL OF EARTHQUAKE ENGINEERING
Volume 13, Issue 3, Pages 293-312Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13632460802598529
Keywords
Seismic Isolation; Lead-Rubber Bearing; Bearing Response Modification; Vertical Load; Strain Rate
Ask authors/readers for more resources
Lead-rubber isolators represent a valid and economic solution for the seismic isolation of bridge structures and modern manufacturing techniques make available large devices. Velocity effects on small to medium-scale isolators have been discussed by several authors (e.g., Clark et al., 1997; Thompson et al., 2000) as well as included in reports of experimental programs (e.g., CERF, 1999). Only recently, however, the behavior of large devices was validated under full-scale displacements, loads, and velocities. In this article, results obtained from an experimental investigation on the effects of axial load and strain rate on the performance of a full-scale lead-core elastomeric bearing for bridge applications, are reported. The bearing response was analyzed with particular attention to the variation of critical performance characteristics in order to produce a set of information that could be implemented in a physically motivated numerical model. The results, in line with additional tests performed on similar full-scale bearings at the Caltrans SRMD Testing Facility at the University of California San Diego, indicate a moderate effect of the applied vertical load but a significant effect of the strain rate and cycling on all the significant response parameters. This information should be taken into account by designers, particularly when high component of velocities are associated with the expected seismic motion. A simplified numerical model is proposed for the assessment of lead-rubber bearing performance.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available