Effectiveness of Exterior-Beam Rotation-Prevention Systems for Bridge Deck Construction—Phase II

Li, Hui; Hraib, Faress; Vicente, Miguel; Hindi, Riyadh

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https://hdl.handle.net/2142/105423 Copy

Description

Title

Effectiveness of Exterior-Beam Rotation-Prevention Systems for Bridge Deck Construction—Phase II

Author(s)

• Li, Hui
• Hraib, Faress
• Vicente, Miguel
• Hindi, Riyadh

Issue Date

2019-09

Keyword(s)

• Exterior-Girder Rotation
• Bridge Deck Construction
• Overhang
• 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.

Publisher

Illinois Center for Transportation/Illinois Department of Transportation

Series/Report Name or Number

FHWA-ICT-19-011

ISSN

0197-9191

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/105423

Sponsor(s)/Grant Number(s)

IDOT-R27-179

Copyright and License Information

No restrictions. This document is available through the National Technical Information Service, Springfield, VA 22161.

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