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Earthquakes and Structures Volume 21, Number 2, August 2021 , pages 173-183 DOI: https://doi.org/10.12989/eas.2021.21.2.173 |
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Experimental and numerical study on seismic behavior of a self-centering railway bridge pier |
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Xiushen Xia, Suiwen Wu, Xinghan Wei, Chiyu Jiao and Xingchong Chen
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| Abstract | ||
| This study mainly focuses on experimental and numerical investigation of the isolation mechanism and seismic performance of a self-centering railway bridge pier. To begin, a 1/25 scale typical self-centering railway pier model was designed and constructed, which consisted of a gravity pier, a spread foundation and a pedestal. The gravity pier was rigidly connected to the spread foundation, which was then directly seated at the top of the pile cap to allow the uplift of the pier during strong earthquakes. The model was tested in a pseudo-static manner under constant axial load and cyclic lateral load to characterize its seismic performance. It was found that the lateral load, the bending moment at the pier bottom, and the width of compression zone at the bottom of pier remained essentially constant when the uplift reached a certain extent. The hysteretic curves were in inverse 'Z' shape with narrow loops indicating good self-centering effect but poor energy dissipation. This means that the lateral force-displacement relationship of this type of piers can be simplified as an elasto-plastic curve and they should be used along with additional energy-dissipation devices. Upon the test results, a two-spring model was proposed and developed in the OpenSees platform to represent the test model, which was analyzed using the test load history. The results indicate that the two-spring model can simulate the pseudo-static test with high precision. This modeling technique hence can be employed to analyze seismic response of this type of bridge piers. | ||
| Key Words | ||
| gravity pier; hysteretic curve; numerical simulation; pseudo-static test; railway bridge; self-centering | ||
| Address | ||
| Xiushen Xia:School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China Suiwen Wu:Department of Civil and Environmental Engineering, University of Nevada, Reno, 89557, U.S.A. Xinghan Wei:Gansu Provincial Highway Aviation Tourism Investment Group Co., Ltd, Lanzhou 730070, China Chiyu Jiao:Beijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture, Beijing, 100044, China/ Engineering Structure and New Materials Research Center of Beijing Higher Education Institutions, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China Xingchong Chen:School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | ||