Experimental Investigation of Multihazard Resistant Bridge Piers Having Concrete-Filled Steel Tube under Blast Loading
Publication: Journal of Bridge Engineering
Volume 13, Issue 6
Abstract
This paper presents the development and experimental validation of a multizard bridge pier concept, i.e., a bridge pier system capable of providing an adequate level of protection against collapse under seismic and blast loading (but not acting simultaneously). A multicolumn pier-bent with concrete-filled steel tube (CFST) columns is the proposed concept, and the adequacy of this system is experimentally investigated under blast loading. This paper describes simplified blast analysis, multihazard design of bridge piers, and blast experimental program and results. Additionally, the results from the blast experiments are compared with the results from the simplified method of analysis considering an equivalent single degree of freedom system having an elastic-perfectly plastic behavior. It is found that prototype bridge CFST columns can be designed to provide both satisfactory seismic performance and adequate blast resistance. It is also shown that the CFST columns exhibited a ductile behavior under blast load in a series of tests at scale. Maximum deformation of the columns could be calculated using simplified analysis considering a factor to account for the reduction of pressures on the circular column and determined from this experimental program.
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Acknowledgments
This research was conducted by the University at Buffalo and was supported by the Federal Highway Administration under Contract No. UNSPECIFIEDDTFH61-98-C-00094 to the Multidisciplinary Center for Earthquake Engineering Research. This support is gratefully appreciated. However, any opinions, findings, conclusions, and recommendations presented in this paper are those of the writers and do not necessarily reflect the views of the sponsors. Special thanks are given to James C. Ray at the Eng. Research and Dev. Center of the USACE for his help and assistance in the logistics of the experiments.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 13 • Issue 6 • November 2008
Pages: 586 - 594
Copyright
© 2008 ASCE.
History
Received: Jun 26, 2007
Accepted: Feb 27, 2008
Published online: Nov 1, 2008
Published in print: Nov 2008
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