Abstract

RICO PRADILLA, Leocadio  and  CHIO CHO, Gustavo. Use of base isolators in simply supported concrete bridges. Tecnura [online]. 2012, vol.16, n.34, pp.103-124. ISSN 0123-921X.

The aim of this paper is to present a comparison of the seismic behavior of simply supported concrete bridges by using three types of base isolators, namely high damping rubber bearing (HDRB), lead rubber bearing (LRB) and friction pendulum system (FPS). "La Flora" viaduct is taken as case study; the geometry and the corresponding modeling of such viaduct are defined in sap2000. Additionally, the mechanical properties of three insulators are defined using a bilinear model. An analysis of histories in time was made for the model of the viaduct, considering the non-linearity in the insulators and using frontal fault earthquakes caused by the Frontal and Bucaramanga-Santa Marta fault; this is applied at a surface-level scale. The results from the model without seismic isolation are compa-red with the three systems of seismic isolation and the findings suggest that the different systems of seismic isolation signifcantly reduce both the demands of the displacements and the cutting forces in the piles of the bridge, which may induce probable earthquakes.

Keywords : friction isolators; elastomeric isolators; seismic isolation; nonlinear dynamic analysis; seismic demand.

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