Abstract
Considering the desirable behavior of concrete filled steel tube (CFT) columns and the complicated behavior of segmental double-column piers under cyclic loads, three post-tensioned precast segmental CFT double-column pier specimens were tested to extend their application in moderate and high seismicity areas. The effects of the number of CFT segments and the steel endplates as energy dissipaters on the seismic behavior of the piers were evaluated. The experimental results show that the segmental piers exhibited stable hysteretic behavior with small residual displacements under cyclic loads. All the tested specimens achieved a drift ratio no less than 13% without significant damage and strength deterioration due to the desirable behavior of CFT columns. Since the deformation of segmental columns was mainly concentrated at the column-footing interfaces, the increase of the segment numbers for each column had no obvious effects on the loading capacity but reduced the initial stiffness of the specimens. The use of steel endplates improved the bearing capacity, stiffness and energy dissipation of segmental piers, but weakened their self-centering capacity. Fiber models were also proposed to simulate the hysteretic behavior of the tested specimens, and the influences of segment numbers and prestress levels on seismic behavior were further studied.
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Acknowledgment
This research was funded by the National Natural Science Foundation of China (51978656 and 51478459) and the Key Research and Development Project of Xuzhou (KC22282). The experiments were also partially funded by the open fund of Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Civil Engineering, China University of Mining and Technology (KFJJ202004).
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Supported by: National Natural Science Foundation of China under Grant Nos. 51978656 and 51478459, the Key Research and Development Project of Xuzhou under Grant No. KC22282, and the Open Fund of Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Civil Engineering, China University of Mining and Technology under Grant No. KFJJ202004
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Li, X., Zhang, Z., Zhou, T. et al. Hysteretic behavior of post-tensioned precast segmental CFT double-column piers. Earthq. Eng. Eng. Vib. 22, 747–762 (2023). https://doi.org/10.1007/s11803-023-2196-6
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DOI: https://doi.org/10.1007/s11803-023-2196-6