Abstract
The present author, collaborating with others, developed earlier a prototype hybrid base isolation system using friction-controllable sliding bearings and demonstrated its effectiveness in circumventing the shortcomings of passive counterparts by means of shaking table tests and numerical analysis under the 1940 El Centro earthquake record linearly scaled to various levels of intensity. The purpose of the present paper is to show that the same hybrid system exhibits a similar degree of effectiveness over a practical range of parameters that define the ground acceleration characteristics. These parameters include spectral shape, dominant frequency, and duration of the ground motion. For this purpose, artificial earthquake ground acceleration histories representing different sets of these parameter values are generated using a modified Kanai-Tajimi spectrum. The bridge responses under these earthquakes are evaluated numerically when the bridge is isolated by passive and hybrid sliding systems. The results demonstrate that the hybrid system indeed more effectively isolates the bridge under a variety of ground motion characteristics.
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