1.MOE Key Lab of Safety and Disaster Mitigation for Urban and Engineering, Beijing University of Technology, Beijing 100124, China;
2.China Construction 8th Engineering Division, Co., Ltd., Shanghai 200112, China
Abstract:Self-centering rocking pier is an important structural form of bridges whose function can be restored after earthquakes. In order to investigate the influence of different design parameters on the seismic performance of self-centering rocking double-column piers, the first self-centering rocking bridge (Hongshizhuang overpass bridge of Jingtai Expressway) in China was selected as the research object of this study. The bearing capacity calculation formula of self-centering rocking double-column piers was derived; ABAQUS finite element software was used to establish the numerical simulation model of self-centering rocking double-column pier, and the accuracy of the model was verified based on the quasi-static test results. Considering the design parameters such as the initial tension of prestressed tendons, the cross-section area of energy dissipaters and prestressed tendons, the influence of these parameters on the seismic capacity of self-centering rocking double-column piers were analyzed. The results showed that with the increase of initial tension and cross-section area of prestressed tendons, the maximum lateral bearing capacity of piers increased, the residual displacement decreased, and the energy dissipation capacity had negligible change. The maximum bearing capacity, residual displacement and energy dissipation capacity of piers increase significantly with the increase of cross-section area of energy dissipaters. The parameter analysis showed that the self-centering rocking pier can have good energy dissipation capacity and small residual displacement at the same time, and the residual displacement rate is 0.56% when the maximum displacement rate of the pier is 4%. The recommended design parameters to form aforementioned situation were that the ratio of prestressed tendons is 0.26%, the initial tension control stress is 0.4 times of the ultimate strength, and the contribution rate of energy dissipaters to the horizontal bearing capacity of the pier is 44.4%. Achievement in this study could provide references for design and assessment of seismic performance of self-centering rocking double-column piers.
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