The effective stiffness and the equivalent damping ratio of bearings that were suggested by specifications are nonlinear with respect to the maximum deformation of the bearing and are always determined iteratively in the design of isolated structures. A simplified model that these equivalent parameters are assumed to be linear to the shear strain is investigated. The suitability of the equivalent linearized parameters of lead-rubber bearings in the prediction of the maximum responses of isolated structures is examined. Due to the fact that various types of lead-rubber bearings may be adopted in the design of isolation structures, the linearized parameters that related to the region are also established. Comparisons of the time histories and the maximum responses of the equivalent linear systems and the actual model show that the predicted responses is quite accurate. The accuracy of the linearized model related to regions is close to that of the linearized model related to the type of lead-rubber bearings.

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