Abstract
Following the 1995 Kobe earthquake, many RC bridge columns were demolished due to a residual drift ratio of more than 1.75 % even though they did not collapse. The residual drift ratio is a quantitative index for the performance objective of reparability in the bridge seismic design. Numerical models of the columns are built to study the factors that influence the residual displacement of RC bridge columns. In these models, both column bending and bar pulling out deformation are considered using the fiber column-beam element and zero-length section element, respectively. Then, nonlinear time history analyses are performed. The factors that influence column residual displacement, such as the characteristics of ground motion, the structural responses (the maximum lateral drift ratio and the displacement ductility factor), and the structural characteristics (the aspect ratio and the longitudinal reinforcement ratio) are investigated. It is found that the near-fault ground motion induces a larger residual drift ratio than the far-fault ground motion. The residual drift ratio becomes larger due to the increase of the maximum lateral drift ratio, the displacement ductility factor, and the aspect ratio. Further, a larger longitudinal reinforcement ratio can induce a larger residual drift ratio due to the contribution of the bar pulling out deformation.
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Acknowledgments
The authors sincerely appreciate the experimental information of RC specimens from the PEER Structural Performance Database, and the quasi-static experiment of RC bridge columns performed in Chongqing Jiaotong University. This research is supported by the National Basic Research Development Program of China (973 Program) (No. 2011CB013605), National Natural Science Foundation of China under Grant (Nos. NNSFC51178071 and NNSFC51478074), and Program for New Century Excellent Talents in University of Ministry of Education of China under Grant (No.CET-12-0751).
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Cheng, H., Li, H., Wang, D. et al. Research on the influencing factors for residual displacements of RC bridge columns subjected to earthquake loading. Bull Earthquake Eng 14, 2229–2257 (2016). https://doi.org/10.1007/s10518-016-9902-y
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DOI: https://doi.org/10.1007/s10518-016-9902-y