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Smart Structures and Systems
  Volume 30, Number 5, November 2022 , pages 479-500

Seismic control of high-speed railway bridge using S-shaped steel damping friction bearing
Wei Guo, Yang Wang, Zhipeng Zhai and Qiaodan Du

    In this study, a new type of isolation bearing is proposed by combining S-shaped steel plate dampers (SSDs) with a spherical steel bearing, and the seismic control effect of a five-span standard high-speed railway bridge is investigated. The advantages of the proposed S-shaped steel damping friction bearing (SSDFB) are that it cannot only lengthen the structural periods, dissipate the seismic energy, but also prevent bridge unseating due to the restraint effectiveness of SSDs in the large relative displacements between the girders and piers. This study first presents a detailed description and working principle of the SSDFB. Then, mechanical modeling of the SSDFB was derived to fundamentally define its cyclic behavior and obtain key mechanical parameters. The numerical model of the SSDFB's critical component SSD was verified by comparing it with the experimental results. After that, parameter studies of the dimensions and number of SSDs, the friction coefficient, and the gap length of the SSDFBs were conducted. Finally, the longitudinal seismic responses of the bridge with SSDFBs were compared with the bridge with spherical bearing and spherical bearing with strengthened shear keys. The results showed that the SSDFB can not only significantly mitigate the shear force responses and residual displacement in bridge substructures but also can effectively reduce girder displacement and prevent bridge unseating, at a cost of inelastic deformation of the SSDs, which is easy to replace. In conclusion, the SSDFB is expected to be a cost-effective option with both multi-stage energy dissipation and restraint capacity, making it particularly suitable for seismic isolation application to high-speed railway bridges.
Key Words
    combination energy dissipation; flexural-tensile behavior; high-speed railway bridge; isolation bearing; numerical modelling; seismic control; S-shaped steel damper
(1) Wei Guo, Yang Wang, Qiaodan Du:
School of Civil Engineering, Central South University, Changsha, China;
(2) Wei Guo, Yang Wang:
National Engineering Research Center of High-Speed Railway Construction Technology, Changsha, China;
(3) Zhipeng Zhai:
Earthquake Engineering Research and Test Center, Guangzhou University, Guangzhou, China.

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