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Abstract

Based on an example of a three-span simply supported girder bridge project in a strong earthquake area in the Americas, seismic response analysis was conducted to compare and analyze the seismic response of different retrofitting methods, such as replacement of ordinary plate rubber bearings, continuous decks, addition of cable restrainers between spans, and replacement of seismic isolation bearings. Meanwhile, the analysis considered the influence of soil constraints at the back of the platform and girder collisions on seismic response. The results show that ordinary plate bearings can reduce the ductility coefficient of bridge piers and achieve seismic isolation effect, but a high risk of girder collision can easily result in the occurrence of lowering of girders. The continuous decks and cable restrainers at the pier top can effectively limit the relative displacement between girders, but special attention should be paid to the bearing capacity verification and support failure of the cable restrainers. Lead core bearings can effectively improve the seismic resistance of bridges, meet the ductility requirements of bridge piers, and reduce the girder collision risk. This paper proposed a specific implementation scheme of strengthening the original bridge by employing seismic isolation bearings and continuous decks, and replacing the continuous decks and seismic isolation bearings.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.044

First Page

278

Last Page

283

Submission Date

March 2025

Reference

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