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Structural Engineering and Mechanics Volume 68, Number 6, December25 2018 , pages 677-689 DOI: https://doi.org/10.12989/sem.2018.68.6.677 |
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Seismic fragility assessment of self-centering RC frame structures considering maximum and residual deformations |
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Lu-Xi Li, Hong-Nan Li and Chao Li
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| Abstract | ||
| Residual deformation is a crucial index that should be paid special attention in the performance-based seismic analyses of reinforced concrete (RC) structures. Owing to their superior re-centering capacity under earthquake excitations, the post-tensioned self-centering (PTSC) RC frames have been proposed and developed for engineering application during the past few decades. This paper presents a comprehensive assessment on the seismic fragility of a PTSC frame by simultaneously considering maximum and residual deformations. Bivariate limit states are defined according to the pushover analyses for maximum deformations and empirical judgments for residual deformations. Incremental Dynamic Analyses (IDA) are conducted to derive the probability of exceeding predefined limit states at specific ground motion intensities. Seismic performance of the PTSC frame is compared with that of a conventional monolithic RC frame. The results show that, taking a synthetical consideration of maximum and residual deformations, the PTSC frame surpasses the monolithic frame in resisting most damage states, but is more vulnerable to ground motions with large intensities. | ||
| Key Words | ||
| self-centering; RC frame; joint seismic fragility; bivariate limit states; maximum deformations; residual deformations | ||
| Address | ||
| Lu-Xi Li and Chao Li: State Key Lab. of Coastal Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, China Hong-Nan Li: School of Civil Engineering, Shenyang Jianzhu University, Shenyang, China | ||