Seismic response of rocking isolated railway bridge piers with sacrificial components
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EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION
Earthq Eng & Eng Vib (2020) 19: 1005-1015
October, 2020
DOI: https://doi.org/10.1007/s11803-020-0610-x
Seismic response of rocking isolated railway bridge piers with sacrificial components Xia Xiushen1†, Wu Suiwen2‡, Shi Jun1§, Jia Junfeng2,3*, Chen Xingchong1† and Ma Huajun1£ 1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2. Department of Civil and Environmental Engineering, MS258, University of Nevada, Reno, NV 89557, USA 3. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
Abstract:
In this study, sacrificial components were incorporated into self-centering railway bridge piers to improve the lateral stiffness. The seismic response of this new detail was investigated. First, the method to compute the initial uplift moment of the self-centering pier is given. In addition, shaking table tests were conducted on a free-rocking pier without sacrificial components, which was used to validate a two-spring numerical model. Good agreement was obtained between the numerical results and experimental data. Furthermore, the validated model was employed to investigate the influence of sacrificial components on the seismic response of rocking piers. For this purpose, two models were developed, with and without sacrificial components. Nonlinear response history analysis was then performed on both models under three historical motions. The results showed that compared to the one without sacrificial components, the rocking pier with sacrificial components has comparable displacement at the top of the pier, and maximum uplift moment at high amplitude motion. Therefore, incorporating sacrificial components into the rocking pier can increase the lateral stiffness at service load and low amplitude frequent earthquakes but can produce comparable response at high seismic excitation. These results provide support for performance-based seismic design of self-centering rocking piers.
Keywords: self-centering rocking pier; shake table tests; sacrificial components; nonlinear response history analysis
1 Introduction It is well-known that during strong earthquakes, bridge piers or columns are commonly designed to allow damage in order to reduce the forces transferred to the foundation (Buckle et al., 2012; Chen, 2012; Noguez and Saiidi, 2012; He et al., 2015; Sun et al., 2017, 2019; Chen et al., 2017b; Zheng et al., 2017; Guo et al., 2018; Jia et al., 2019, 2020b). However, the bridge foundation is usually designed to be elastic based on the capacityprotection design principle (Priestley et al., 1996; Huang et al., 2018). The damage to the piers and columns poses a significant challenge to post-earthquake repair. To reduce this damage and improve resilience of the bridge system, seismic isolation is frequently employed, which elongates the period of the structure to reduce the force demands to the substructures (Kunde and Jangid, 2001; Kawashima, 2004; Cao et al., 2020; Wu et al., 2019a, Correspond
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