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Title:Effectiveness of Exterior Beam Rotation Prevention Systems for Bridge Deck Construction
Author(s):Ashiquzzaman, Md; Li, Hui; Schmeltz, Justin; Merino, Carlos; Bozkurt, Bora; Ibrahim, Ahmed; Lindquist, Will; Hindi, Riyadh
Subject(s):overhang width
exterior girder rotation
rotation prevention system
TAEG program
experimental study
Geographic Coverage:Illinois
Abstract:Bridge decks often overhang past the exterior girders in order to increase the width of the deck while limiting the required number of longitudinal girders. The overhanging portion of the deck results in unbalanced eccentric loads to the exterior girders, which are generally greatest during construction. These eccentric loads mainly come from the bridge placing and finishing equipment as well as fresh concrete and other construction live loads that can create rotation of the exterior girders in the transverse direction. The rotations can also affect both the global and local stability of the girders as well as the bridge. In this study, the current bracing systems used by the Illinois Department of Transportation (IDOT) were evaluated through field instrumentation, finite element analysis (FEA), and the use of the Torsional Analysis Exterior Girders (TAEG)) program. Alternative bracing systems were evaluated through an experimental study and FEA. Based on this work, it is recommended that intermediate cross frames with top and bottom angles in addition to cross-angle sections in the exterior panels be specified to limit exterior girder rotation during construction. An alternative approach is to place transverse ties and diagonal pipes in the exterior panels at a spacing to maintain the spacing-to-girder-depth ratio below 3.94.
Issue Date:2016-06
Publisher:Illinois Center for Transportation/Illinois Department of Transportation
Citation Info:Ashiquzzaman, Md. Li Hui, Justin Schmeltz, Carlos Merino, Bora Bozkurt, Ahmed Ibrahim, Will Lindquist, Riyadh Hindi. 2016. Effectiveness of Exterior Beam Rotation Prevention Systems for Bridge Deck Construction. A report of the findings of ICT-R27-140. Illinois Center for Transportation Series No. 16-016. Research Report No. FHWA-ICT-16-015. Illinois Center for Transportation, Rantoul, IL.
Series/Report:Illinois Center for Transportation Series No. 16-016; Research Report No. FHWA-ICT-16-015
Genre:Technical Report
Sponsor:Illinois Department of Transportation, R27-140
Rights Information:No restrictions. This document is available through the National Technical Information Service, Springfield, VA 22161
Date Available in IDEALS:2016-08-10

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