Blast Load Effects on Highway Bridges. II: Failure Modes and Multihazard Correlations
Publication: Journal of Bridge Engineering
Volume 19, Issue 4
Abstract
Bridges with different seismic design levels and concrete compressive strengths have been analyzed for three levels of underdeck blast loads. It is observed that there are several other damage modes besides failure of bridge columns that may contribute to a complete collapse of the bridge. In general, it is demonstrated that an increased seismic resistance leads to improved performance during blast loads. Both concrete strength and seismic capacity are equally effective for bridges designed with higher seismic resistance. Extensive simulations have been performed to establish a correlation between the ratio of ductility and strength reduction factor, , and pier top displacement for concrete with different compressive strengths. It has been observed that the pier top displacement decreases drastically for . Moreover, it is observed from results of 27 simulations that bridge piers with survive high levels of blast loads (without failure of piers).
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Acknowledgments
The research presented in this paper has been supported partially by a project funded by the Region II University Transportation Research Center at the City College of New York. Results and/or opinions presented in this paper are those of the authors and do not represent the opinions of funding agencies or their employers.
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Published In
Journal of Bridge Engineering
Volume 19 • Issue 4 • April 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 7, 2013
Accepted: Aug 15, 2013
Published online: Aug 19, 2013
Published in print: Apr 1, 2014
Discussion open until: May 26, 2014
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