Experimental Identification of Force-Displacement Behavior for Passive Dampers in a Four Story, Reinforced Concrete, "Smart" Base-Isolated Structure

Abstract eng:
In this paper, the force and displacement sensing data from full-scale experimental tests of a base-isolated structure are analyzed to create a model for the hysteretic behavior observed in the isolators; the intent is that this model could be used for future nonlinear finite element studies and simulations. Displacement data is available in both of the horizontal planar directions of the motion, meaning that the hysteric force will be bi-axial and, thus, modeled by coupled nonlinear differential equations. A Bouc-Wen model was assumed for parameter fitting. Identification was first performed using the random base motions; however, it was revealed that the amplitudes of motion were small enough that the isolators exhibited generally linear behavior. A series of tests were also conducted in which the input intensity of both historical and synthetic earthquakes was gradually increased. Due to the well-documented amplitude dependence of nonlinear phenomena, the tests with the largest input amplitudes were using for identification; the resulting parameters were applied to the lower intensity tests to evaluate the model’s ability to predict responses of different levels of excitation.

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