Failure Analysis and Damage Assessment of RC Columns under Close-In Explosions
Publication: Journal of Performance of Constructed Facilities
Volume 29, Issue 5
Abstract
Blast loads acting on structural components under close-in explosions are nonuniform; therefore, the damage to structural members under such blast loads is local and the failure mechanism is more complex as compared with that of distance explosions. Because of the lack of an accurate blast load model, a precise damage analysis method, an efficient damage assessment method, and practical protective measures, the blast-resistant design of structural members under close-in explosions faces great challenges. In this paper, a fluid-solid coupling numerical method is proposed and then used to investigate the failure mechanism of reinforced concrete (RC) columns under close-in explosions. The results show that local failure, such as crushing, cratering, and spall of concrete, is more likely to happen when the RC column is subjected to close-in blast loads. Parametric studies are carried out to investigate the influences of column dimensions and the reinforcement ratio on the damage degree of RC columns. Based on the numerical results, a rapid damage assessment method is also proposed and validated in this paper. The results show that the proposed method can efficiently evaluate the damage degree of RC columns and can be used in the blast-resistant design of RC columns to protect against close-in explosions.
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Acknowledgments
The authors gratefully acknowledge the support of this research by the China National Nature Science Foundation (grant numbers 51378347 and 51238007), Tianjin Nature Science Foundation (grant number 12JCQNJC04800), and the Fund of the State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact (PLA University of Science and Technology) (grant number DPMEIKF201302).
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© 2015 American Society of Civil Engineers.
History
Received: Jul 24, 2014
Accepted: Feb 18, 2015
Published online: Apr 8, 2015
Discussion open until: Sep 8, 2015
Published in print: Oct 1, 2015
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