Abstract

Rocking piers have significant advantages in limiting the residual post-earthquake displacement of the pier top and reducing thus the structural damage. However, the application and research of such kind of piers are mainly concentrated on highway bridges. To study the applicability of rocking pier in high-speed railway (HSR) bridge-track system under strong ground motions, a preliminary rocking seismic design method for HSR gravity piers is proposed. The HSR simply supported beam bridge-track-subgrade integrated finite element model of the conventional pier system and the rocking pier system are established. The seismic response of the two pier systems under strong ground motions is compared and analysed. Results show that under strong ground motions, in the HSR bridge-track system, rocking bridge piers can exhibit smaller bending moments at the pier bottom and residual displacement at the pier top concerning conventional piers. Hence, the piers can effectively be protected from damage during a seismic event, while the bearings and the sliding layer exhibit smaller residual post-earthquake deformation. Thereby, with this system, it is possible to significantly improve the geometric irregularities of the rails, and increase the safety and comfort of running after strong ground motions.

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