An Experimental Study on Practical Use of a Lead Rubber Bearing With Fail-Safe Mechanism

Abstract

Dynamic and quasi-static loading tests for scaled and full-scale FSLRB, a new isolation bearing which consists of a conventional lead rubber bearing (LRB) and a slider bearing in series, are mentioned. The test results show that torsional behavior of LRB part in bi-directional excitation does not affect the limit state of the bearing, and both dynamic and static friction coefficients are accurately estimated by newly proposed equations utilizing effective surface pressure instead of mean surface pressure. As a conclusion, the authors think that the bearing is ready for the practical use in an isolation system with even higher seismic safety.

Research of Residual Deformations of Seismic Isolation Systems with Rubber-Metal Supports with Lead Core Under Seismic Effect

“…The use of rubber supports for seismic isolation of buildings and structures is widespread in countries exposed to seismic effects. Initially rubber mounts were used for bridge piers, later they were used for seismic insulation of buildings [5][6][7]. In the horizontal plane, the supports provide the possibility of a flexible movement of the building, while in the vertical plane they have a rather high rigidity.…”

“…Depending on the damping characteristics, rubber-metal seismic isolating supports are distinguished from low (without core) and high (with lead core) damping. Fig.1 [6][7] Rubber supports with a lead core with strong effects can get large residual deformations that reduce their effectiveness or preclude their use as elements of seismic isolation. The possibility of large residual deformations in these supports confirms the characteristic type of dependence "Restoring force-displacement" for supports with a lead core shown in Fig.…”

“…In the last decade, the second direction has been developing more intensively, as it allows to reduce the costs of seismic amplification of buildings and structures and increase their reliability. Among these systems, rubber-metal supports are more popular in practice, mass production of which is established in many developed countries [1][2][3][4]. The support itself is made without a core and with a lead core, which increases the damping properties of the supports.…”