Abstract
This paper investigated the seismic retrofitting of an existing cable-stayed bridge through the use of a seismic isolation system. The bridge is situated in a high seismic zone. During the Saguenay earthquake 1988, one of the anchorage plates of the bridge supports failed. Herein, several configurations of seismic isolation system were considered to identify an appropriate solution for the seismic retrofitting of the bridge in both the longitudinal and transverse directions. A three-dimensional model of the bridge was created, and its seismic behavior studied through nonlinear dynamic time-history analysis. The comparative performance study among the five retrofitting configurations showed that the partial seismic isolation of the bridge led to an enhancement of the seismic response of the bridge in one direction only. However, the overall seismic response of the cable-stayed bridge substantially improved in the longitudinal and transverse directions in cases where the isolation systems were utilized between the supports and the deck-tower connection of the bridge.
Highlights
In recent decades, the construction of cable-stayed bridges has rapidly increased around the globe due to certain advantages, e.g., pleasing aesthetics, lighter weight, and longer span as a result of the usage of smaller structural members, and, higher load capacity
It is essential to keep the bridges in service after ground motion excitations for emergency situations
This paper studies the seismic response enhancement of an existing metallic cable-stayed bridge using the seismic isolation system
Summary
The construction of cable-stayed bridges has rapidly increased around the globe due to certain advantages, e.g., pleasing aesthetics, lighter weight, and longer span as a result of the usage of smaller structural members, and, higher load capacity. They are associated with a longer fundamental period, low structural damping, and greater flexibility, which makes them susceptible to large amplitude oscillation under earthquake excitations [1,2]. Several researchers have investigated the seismic and dynamic behavior of cable-stayed bridges [9,10,11,12,13].
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