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. This paper presents the results of a numerical study aimed at developing a rational approach to assess the degradation of mechanical properties of lead-core bearing devices used for passive seismic isolation. The lead-core rubber bearing is modeled as a multiple-component system. Appropriate constitutive laws and failure criteria are defined for each component of the system. Two alternative constitutive relations are defined for the lead core: bilinear material model by assuming isotropic hardening after yielding, and a model formulated in the framework of continuum damage mechanics. The numerical procedure used to simulate the mechanical response of the device allows the monitoring of accumulated mechanical damage throughout the loading history. Preliminary simulation results obtained by finite element analysis are reported. Specifically, these are shear force-displacement hysteresis loops under various loading conditions in a typical characterization test.

MODELING THE MECHANICAL RESPONSE OF A LEAD-CORE BEARING DEVICE: DAMAGE MECHANICS APPROACH