Seismic Retrofit of a Cable-S tayed Bridge with Passive Control Techniques: A Comp ar

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Seismic Retrofit of a Cable-S tayed Bridge with Passive Control Techniques: A Comp arative Investigation through Non-Linear Dynamic Analyses

Author: M.D. Martínez-Rodrigo ; A. Filiatrault | Size: 536 KB | Format: PDF | Quality: Unspecified | Publisher: Department. of Civil, Structural and Environmental Engineering, State University of New York at Buffalo, USA | Year: 2012 | pages: 10

The present contribution deals with the seismic performance of an existing cable-stayed steel bridge. The structure experienced damage during the Saguenay earthquake in 1988 needing structural rehabilitation. As an alternative, in this study the retrofit of the structure with different passive supplemental damping and seismic isolation systems is proposed and evaluated in order to achieve an admissible performance of the bridge under a set of seismic events of different magnitudes including near field records. To this end a Finite Element numerical planar model is implemented and the bridge response is obtained trough non-linear dynamic analyses. Strength degradation capabilities are included in the model allowing the occurrence of brittle failure when certain levels of ductility are exceeded in the members. The major improvement in the overall response of the bridge is shown
and conclusions regarding the most appropriate retrofit alternative for the particular case are derived.

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