Shaking-table tests and numerical simulations on a subway structure in soft soil |
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| Affiliation: | 1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China;2. Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China;3. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China;4. School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;1. School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran;2. Center of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran;1. Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China;2. Department of Civil Engineering, University of British Columbia, Vancouver, BC, Canada;1. National Research Institute for Earthquake Science and Disaster Prevention, 1501-21 Nishikameya, Mitsuta, Shijimicho, Miki, Hyogo 673-0515, Japan;2. Kobe Gakuin University, 1-1-3 Minatojima, Chuoku, Kobe, Hyogo 650-8586, Japan;3. Kanto Gakuin University, 1-50-1 Mutsuurahigashi, Kanazawaku, Yokohama, Kanagawa 236-850, Japan;4. Tokyo Denki University, Hatoyama, Hikigun, Saitama 350-0394, Japan;1. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;1. School of Civil Engineering and Architecture, Xiamen University of Technology, Xiamen 361000, China;2. State Key Laboratory for Disaster Reduction in Civil Engineering, TongJi University, Shanghai 200092, China;3. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China |
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| Abstract: | Shaking table tests were performed to investigate the damage mechanisms of a subway structure in soft soil while experiencing strong ground motions. The seismic responses of the structure and soil were found to be more sensitive to input motions with richer low-frequency components. The excess pore pressure ratio of soil increased slightly, and the distribution of the excess pore pressure surrounding the structure showed clear spatial effects. The frequency spectrum characteristics of input ground motions clearly influenced the lateral displacement of the structure. In addition, the structure was most severely damaged at the top or the bottom of the interior columns. Finite element analyses were conducted by using the modified Martin–Seed–Davidenkov viscoelastic and the rate-independent plastic-damage constitutive models for soil and concrete, respectively. Satisfactory agreement was observed between the simulation and test results, the difference between these results was discussed in detail. The results provide insight into how the characteristics of strong ground motion might influence and present a simplified analysis method to quantitatively evaluate the damage of subway structures in soft soil. |
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| Keywords: | Shaking table test Numerical simulation Soft soil Subway station structure Seismic damage behavior |
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