International Journal of Lifecycle Performance Engineering
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International Journal of Lifecycle Performance Engineering (1 paper in press)
Rocking Isolation of High Bridge Pier with Uplifting and Self-centering Functions by Xiaohong Long, Yongtao Ma, Ahmed Turgun, Shaokang Deng Abstract: The high bridge pier and pile foundation are separated and designed by the uplifting and self-centering functions. The bridge pier and the foundation are separated for the rocking isolation, and the self-weight of the bridge span and bridge pier are used to balance the braking force, wind load and seismic action to meet the serviceability requirements. Relying on the self-weight and the self-centering device, self-centering of the bridge can be achieved to protect the pier and prevent the pile foundation from being damaged after the earthquake. Firstly, the analytical expression of the two-spring lift-off model of high pier without self-centering function is deduced. The effectiveness of the model is verified by finite element method and theoretical analysis. Secondly, the two-spring lift-off model of the high pier with self-centering (contains the restrainer and energy-dissipating device) and uplifting function is proposed, and the finite element method is used to verify and improve the rocking isolation model of the high pier bridge. Finally, a high pier bridge is selected as the target structure, the rocking isolation study is conducted by using the nonlinear time-history analysis method by inputting four earthquake records. The initial clearance and yield force of the restrainer, the damping coefficient and elastic coefficient of the energy-dissipating are discussed in order to investigate the corresponding effects on the top displacement of the bridge pier and the bottom bending moment of the bridge pier, respectively. Keywords: High bridge pier; Rocking isolation; Uplifting and self-centering; Restrainer;