Practical application of lead rubber bearings with fail-safe mechanism

The results of dynamic and quasi-static loading tests for scaled and full-scale Lead Rubber Bearing with Fail-Safe mechanism, an alternative isolation bearing that consists of a conventional lead rubber bearing and a slider bearing in series, are discussed. The test results show that the torsional behavior of the lead rubber bearing component in bi-directional loading does not significantly affect the limit state of the bearing. Moreover, both dynamic and static friction coefficients are estimated with high accuracy by utilizing a newly proposed effective surface pressure instead of the conventional mean surface pressure. The proposed bearing can be used in practical applications in an isolation system with a high seismic safety margin