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| Experimental Research on the Railway Gravity Bridge Piers with Reinforced Longitudinal Reinforcement at Pier Bottom |
| LU Jinhua, CHEN Xingchong, DING Mingbo, MA Huajun |
| Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China |
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Abstract Research purposes: In order to improve the seismic performance of railway gravity bridge piers with low longitudinal reinforcement ratio, the design method is proposed to locally increase the amount of longitudinal reinforcement at the bottom of the pier. Five model piers with different reinforcement height are made, and the seismic performance of the piers with only increased the longitudinal reinforcement ratio at the bottom of the pier is compared and analyzed through the pseudo-static test.
Research conclusions: (1)The calculation method of the height of the longitudinal reinforcement is determined and the calculation formula of the height of the longitudinal reinforcement is deduced. (2)The horizontal bearing capacity and energy dissipation capacity of the pier can be effectively improved by increasing longitudinal reinforcement ratio at the bottom of the pier. (3)The bearing capacity and energy dissipation capacity of the pier with the supplementary longitudinal bars at the bottom are basically the same as that of the pier with the same longitudinal reinforcement ratio at the supplementary place, and the stiffness will not be reduced basically. (4)The results of the pseudo-static test verify the feasibility of enhancing the seismic performance of the pier by increasing the number of longitudinal bars on the bottom of the pier and the rationality of the calculation method of the height of the increased longitudinal reinforcement. (5)The research results can be applied to the design of piers which need to improve the seismic performance.
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Received: 28 January 2021
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2022, Vol. 39 
