Multiscale Modeling and Seismic Fragility Analysis of Corroded Precast Concrete Frame
Publication: Journal of Performance of Constructed Facilities
Volume 35, Issue 1
Abstract
Precast concrete frames have been widely used, though little is known about their fragility under the combined influence of seismic excitation and corrosion. In this study, one four-story precast concrete frame with different corrosion levels is taken as an example, which is simulated by using a multiscale finite-element model consisting of solid elements for corroded beam-column joints and beam elements for beams and columns, respectively. A fiber model is proposed to simulate the hysteretic behavior of corroded steel bars by employing the user-defined material subroutine in Abaqus. The proposed multiscale finite-element model is validated through existing experiments, so that a balance between accuracy and computational costs is obtained. Based on the proposed finite-element model, the influence of corrosion on seismic fragility of the frames is investigated through incremental dynamic analysis. Four limit states regarding the maximum interstory drift ratio are defined to evaluate seismic fragility. The analysis results show that structural responses are highly random under different ground motions and corrosion levels. Meanwhile, the seismic fragility of the frame is significantly influenced by corrosion ratios, and the probabilities of exceedance show exponential growth with the increase of corrosion level for all four limit states.
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Data Availability Statement
All data or models generated or used during the study are available from the corresponding author by request. The items that can be provided include multiscale modeling in connection with Fig. 4 in Abaqus, analytical modeling in Abaqus, and a comparison of the test results and numerical simulation of the corroded joints. Seismic fragility analysis results and other data or results appear in the published article.
Acknowledgments
The authors would like to acknowledge the support of the Ministry of Science and Technology of the People’s Republic of China under Grant No. 2018YFE0206100 and the Postgraduate Research and Practice Innovation Program of Jiangsu Province under Grant No. KYCX18_0114.
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Published In
Journal of Performance of Constructed Facilities
Volume 35 • Issue 1 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Feb 27, 2020
Accepted: Jul 17, 2020
Published online: Oct 29, 2020
Published in print: Feb 1, 2021
Discussion open until: Mar 29, 2021
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