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CONCLUSIONS
516
This paper presents a case study on the seismic response of the 91/5 Overcrossing that is equipped with
isolation bearings and fluid dampers at its end-abutments. The study adopts the substructure method and a
reduced-order stick model. The simple macroscopic constitutive laws of the main substructure elements
are proposed. The study reveals that lengthening of the period of an overcrossing by introducing isolation
bearings reduces the longitudinal accelerations of the deck but increases the translational accelerations.
The supplemental damping is beneficial but in many cases the configuration with integral abutment is
shown to yield the most favorable response. Soil-structure interaction is responsible for increasing
displacements while having mixed effect on accelerations. The response of the isolated bridge is
significantly underestimated when soil-structure interaction is neglected.
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