Study on Self-Centering Seismic Isolation at the Bottom of Fixed Pier in Continuous Bridge
Publication: Lifelines 2022
ABSTRACT
In general, only one fixed pier is set in a continuous bridge. It is difficult to satisfy seismic demand of the fixed pier in a highly seismic area. To solve this problem, a pier-bottom seismic isolation structure with self-centering (PSIS-S) was placed at the bottom of the fixed pier, whose contact surface was elliptical. Under a strong earthquake, there was a relative swing between the bottom of the fixed pier and bearing platform, preventing the seismic energy from transferring to the fixed pier and superstructure. After the peak value of the ground motion, the continuous bridge can basically return to the initial equilibrium position under the action of the self-weight and seismic residual energy. A shake table test and simulations of a three-span continuous bridge were conducted. Then, taking a five-span continuous bridge as an example, the influence of main parameters of the PSIS-S structure on its seismic isolation effect, was studied. The results showed that the PSIS-S structure can effectively reduce the seismic response of the fixed pier, and that the residual deformation of the bridge was small, meaning that the PSIS-S structure had a self-centering capability. The ratio of the long radius to the short radius of the ellipse had a great influence on the seismic isolation effect of the PSIS-S structure, but the effect of friction coefficient could be ignored.
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Lifelines 2022
Pages: 210 - 222
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Published online: Nov 16, 2022
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