The approach to seismic isolation incorporates energy dissipation in the isolation system, in order to reduce the displacements required across the isolating supports, to further reduce seismic loads, and to safeguard against unexpectedly strong low-frequency content in the earthquake motion. Structural response can often be limited to the elastic range in the design-level earthquake, with limited ductility requirements during extreme earthquake conditions.

The use of seismic isolation systems is one of the ways of aseismic designing of bridges. The dynamic modelling for analysis and design of this type of the structures is very important. The aim of this paper is to: 1) choose the suitable model for explaining the dynamic behaviour of bridges; 2) the effect of isolators locating in the structure of bridges. The paper also pay attention to analyzing the behavior of materials and isolaters which assumed to be linear and the effect of variation of some parameters such as stiffness variation of deck, piers and elastomeric bearings. The nonlinear, behaviour for isolators has been investigated too. The comparison of different isolators parameters has been studied and the results are shown by Figures.

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