Skewed Slab-on-Girder Steel Bridge Superstructures with Bidirectional-Ductile End Diaphragms
Publication: Journal of Bridge Engineering
Volume 16, Issue 2
Abstract
Specially designed ductile end diaphragms of steel bridge superstructures have previously proved, both theoretically and experimentally, to dissipate seismic input energy, protecting other substructure and superstructure members. Although ductile diaphragms have been introduced in the latest AASHTO guide specifications as a structural system that can be used to resist transverse earthquake effects, no guidance is provided on how to implement these ductile diaphragms in skewed bridges. To address this need and to resolve some shortcomings of the known end diaphragm systems (EDSs), two bidirectional end diaphragm configurations, namely, EDS-1 and EDS-2, with buckling restrained braces (BRBs) are proposed and numerically investigated. Bidirectional end diaphragm is a new concept, and can be implemented both in straight and skewed steel bridge superstructures to resist bidirectional earthquake effects. To assess the relative effectiveness of the proposed systems and to investigate how various parameters relate to seismic response, closed-form solutions are developed using nondimensional bridge geometric ratios. Numerical results indicate that skewness more severely affects end diaphragm behavior when . Also, comparisons reveal that although both end diaphragm systems can be used with confidence as ductile seismic fuses, each of the two systems considered have advantages that may favor its implementation, depending on project-specific constraints.
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Acknowledgments
This research was conducted by the State University of New York (SUNY) at Buffalo and was supported by the Federal Highway Administration (FHWA) under contract number FHADTFH61-98-C-00094 to the Multidisciplinary Center for Earthquake Engineering Research (MCEER). However, any opinions, findings, conclusions, and recommendations presented in this paper are those of the authors and do not necessarily reflect the views of the sponsors.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 16 • Issue 2 • March 2011
Pages: 207 - 218
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 12, 2009
Accepted: Apr 15, 2010
Published online: May 29, 2010
Published in print: Mar 1, 2011
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