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Title:Effectiveness of Exterior-Beam Rotation-Prevention Systems for Bridge Deck Construction—Phase II
Author(s):Li, Hui; Hraib, Faress; Vicente, Miguel; Hindi, Riyadh
Subject(s):Exterior-Girder Rotation
Bridge Deck Construction
Rotation-Prevention System
B/D Ratio
Abstract:During bridge deck construction, construction loads are transferred through the overhang-formwork system into the girder system, resulting in significant torsional moments acting on the exterior girder. In some cases, these torsional moments can lead to excessive exterior-girder rotation, thin bridge decks, and cause potential safety and maintenance issues for the bridge. To resist these torsional moments, temporary rotation-prevention systems are commonly used during deck construction. The Illinois Department of Transportation (IDOT) recommended a new rotation-prevention system, which uses a transverse tie combined with a diagonal pipe to limit exterior-girder rotation. This system has been evaluated and validated to be effective, and efficient, based on the finite-element (FE) analysis in Phase I of this research project. In this study, the transverse tie–diagonal pipe system was evaluated through field instrumentation and FE analysis. Also, additional FE analysis was conducted to assess the effects of various parameters of this system, such as the dimensions of the members of this system, protective rubber at the end of pipes, and depth of connecting plates between the diaphragms and girders. Based on the results from this research, it is suggested that larger sections of ties and pipes should be used to ensure the stiffness of the temporary bracing system; and the protective rubber should be eliminated. Furthermore, a maximum ratio of unbraced length to girder depth (B/D ratio) of 4 is recommended when considering the effects of the diaphragm-to-girder connection.
Issue Date:2019-09
Publisher:Illinois Center for Transportation/Illinois Department of Transportation
Citation Info:Hui, Li, Faress Hraib, Miguel Vicente, and Riyadh Hindi. 2019. Effectiveness of Exterior-Beam Rotation-Prevention Systems for Bridge Deck Construction—Phase II. A report of the findings of ICT-R27-179. Illinois Center for Transportation Series No. 19-014. Research Report No. FHWA-ICT-19-011. Illinois Center for Transportation, Rantoul, IL.
Genre:Technical Report
Rights Information:No restrictions. This document is available through the National Technical Information Service, Springfield, VA 22161.
Date Available in IDEALS:2019-09-12

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