- 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: | SHAO Changjiang, CUI Haomeng, QI Qiming, WEI Wang, ZHUANG Weilin, HUANG Hui, YUAN Dezheng. Optimization of Seismic Isolation Bearing Scheme of RC Long-Span Soft Arch Bridge under Near-Field and Far-Field Ground Motions[J]. Journal of Southwest Jiaotong University, 2024, 59(3): 615-626. doi: 10.3969/j.issn.0258-2724.20220122
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In order to investigate the influence of different ground motion inputs on the seismic isolation of a long-span soft arch bridge, the response law of the bridge structure under near-field and far-field ground motions was analyzed by nonlinear finite element model, and the optimal arrangement scheme of the bridge bearings was obtained. Firstly, based on modal analysis, the difference in dynamic characteristics between the bridge and the traditional reinforced concrete (RC) arch bridge was compared. Secondly, the records of near-field ground motions with different pulse periods, near-field pulseless ground motions, and far-field long-period ground motions were selected. Finally, the response behavior and damage evolution path of the arch bridge under near-field and far-field ground motions were studied, and the design scheme of the bridge’s seismic isolation bearing was optimized. The research results show that the structural responses of the bridge under near-field pulse and far-field long-period ground motions are larger than those under pulseless ground motions. The envelope curves of shear force and bending moment of high pier columns were distributed in an S shape under longitudinal and vertical ground motions. A plastic hinge is prone to form in the middle of the pier body, and the effect of high-order vibration mode is significant. The longitudinal direction of the bridge first encounters seismic damage, followed by the transverse direction, and the damage paths are successively low column, high pier column, and solid-hollow section of arch rib. The friction pendulum bearing embodies the most excellent seismic isolation performance with larger displacement. High damping bearing scheme fails to avoid damage under near-field middle and long pulse period ground motions and far-field long-period ground motions. The laminated-rubber bearing scheme can not form a quasi-seismic isolation system because it cannot guarantee the synchronous sliding of the bearing. The hybrid scheme consisting of high damping bearing and friction pendulum bearing leads to small bearing displacement, with arch rib and pier column in an elastic state, which is the optimal seismic isolation scheme for long-span soft RC arch bridge in the near-fault regions.
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