Seismic Performance Analysis of Self-Centering Rocking Pier of High-Speed Railway

Based on the OpenSEES platform, the finite element models of the traditional simply-supported beam bridge and the rocking pier simply-supported beam bridge system of the four-span high-speed railway are established respectively. According to the basic seismic design principle of rocking pier, the area and bearing capacity of energy dissipation components are designed. On the basis of considering the randomness of ground motion, the seismic performance of self-centering rocking pier of high-speed railway bridge system is studied. The results indicates that the self-centering rocking energy dissipation device can effectively reduce the maximum bending moment at the bottom of the pier under rare occurrence earthquake, and the vibration reduction ratio is 20. 26%, thereby reducing the damage of the pier body. But the collision effect enlarges the maximum axial force at the pier bottom by 74. 7%. The energy dissipation components at the bottom of the pier are basically plastic but not completely damaged, which can be quickly repaired after the earthquake. The maximum pier top displacement of the rocking pier is 66% higher than that of the traditional pier, but the selfresetting rigid body rotation deformation in the displacement composition is much larger than the bending deformation, so the residual displacement after the earthquake is reduced by 35%. The vibration reduction ratio of the rocking energy dissipation mechanism on the maximum deformation of the bearing is 12. 3%, which increases the maximum deformation of the main beam by about 49%, and the influence on the residual deformation is within 1 mm. The track constraint weakens the rocking behavior of the pier, which reduces the maximum displacement of the pier top by 14%, but it has no significant effect on the residual displacement of the pier top. © 2024 Chinese Academy of Railway Sciences. All rights reserved.