- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | WANG Yong, GU Hailong, AI Zongliang, XIANG Lükai, LI Xiaozhen, JIA Lizhi, HU Yuanhong, SONG Jianping. Development and Experimental Research on Spherical Bearings for Vertical Vibration Isolation of Bridges[J]. Journal of Southwest Jiaotong University, 2026, 61(1): 102-110. doi: 10.3969/j.issn.0258-2724.20240203
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In order to reduce the impact of vehicle-induced vibration on the surrounding environment of high-speed railway bridges, firstly, a spherical bearing with built-in metal disc isolators for vertical vibration isolation of bridges was proposed, and the mechanical constitutive model and overall vertical stiffness calculation method of the bearings were given. The design compliance of the vertical stiffness of the metal disc isolator was studied by combining simulation and experimental comparison. Simulation was also used to analyze the influence of different friction support surfaces on the vertical stiffness and stress of the metal disc isolator. Secondly, through a series of tests on spherical bearings for vertical vibration isolation, the conventional performance, vertical stiffness, isolation load, dynamic and static stiffness ratio, and stiffness stability of the bearings were studied. Finally, taking the 32-meter-span concrete simply supported box girder of high-speed railway as the background, the vibration isolation effect of the bearings under the action of trains was explored. The results show that the deviation between the simulated and measured vertical stiffness values of the metal disc isolator with three different vertical bearing capacity designs is within ±10%. The friction coefficient of the bottom support surface of the metal disc isolator ranges from 0.01 to 0.10, with a 2.1% increase in vertical stiffness and a 0.9% decrease in stress. The conventional performance of the spherical bearing for vertical vibration isolation meets the design requirements, and the deviation between the test values and the design values of vertical stiffness and isolation load is less than ±10%. The vertical stiffness of the bearing remains stable after overload and unloading, providing protection for the metal disc isolator. At an excitation frequency of 1–17 Hz, the range of the dynamic to static stiffness ratio of the bearings is 1.00–1.15. The stiffness increase of the bearings after 10 million fatigue cycles is less than 10%, and all components are intact. The bridge supported by spherical bearings for vertical vibration isolation meets the requirements of train safety and riding comfort indicators. The soil vibration response attenuation of the former bridge is about 4 dB higher than that of the bridge supported by ordinary spherical bearings.
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