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http://dx.doi.org/10.12989/sem.2018.68.6.677

Seismic fragility assessment of self-centering RC frame structures considering maximum and residual deformations  

Li, Lu-Xi (State Key Lab. of Coastal Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology)
Li, Hong-Nan (State Key Lab. of Coastal Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology)
Li, Chao (State Key Lab. of Coastal Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology)
Publication Information
Structural Engineering and Mechanics / v.68, no.6, 2018 , pp. 677-689 More about this Journal
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.
Keywords
self-centering; RC frame; joint seismic fragility; bivariate limit states; maximum deformations; residual deformations;
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Times Cited By KSCI : 6  (Citation Analysis)
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