HIGH DAMPING RUBBER BEARING ISOLATORS: QUASI- LINEAR MECHANICAL MODEL FORMULATIONS

Abstract eng:
In this work, we present two sub-categories of models for reproducing the mechanical response of high damping rubber bearings, which is a base isolation system that is commonly used for buildings in seismically-prone regions of the EU. These are the trilinear models that have evolved from the more standard group of bilinear models. These trilinear models are built by combining linear and nonlinear elastic springs, as well as sliders, while the connectivity of these elements can be either in series or in parallel, which yields the two basic sub-categories of first type and second types. The best fit with experimentally obtained results involving time-harmonic tests on a commercial high damping base isolator at shear amplitudes up to 200% is achieved by the trilinear hysteretic system of the first type. Future extensions to bi-directional horizontal motion and to time-varying vertical loads is currently under consideration.

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