Structures Congress 2019
Diaphragm Orientation Effect on the Rotation of Exterior Girders during Construction in Skewed Bridges
Publication: Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components
ABSTRACT
The unbalanced eccentric loads on the overhang portion of the deck slab during construction cause excessive rotation in the exterior girders and deflection of the overhang formwork. Hence, issues during the construction occur in addition to future deficiencies in the deck slab. This study investigates the effect of different lateral bracing system layouts on exterior girder rotation in skewed bridges during construction. Finite element models of bridges with different diaphragm layouts and screed machine orientations are developed to examine this phenomenon. The results showed that utilizing the diaphragms perpendicular to the girders leads to lower rotation values compared to using diaphragms parallel to the skew. It also concluded that placing the screed machine perpendicular to the girders can cause a high differential rotation between both exterior girders.
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ACKNOWLEDGEMENT
This publication is based on the results of ICT-R27-179, Effectiveness of Exterior Beam Rotation Prevention Systems for Bridge Deck Construction - Phase II. ICT-R27-179 was conducted in cooperation with the Illinois Center for Transportation; the Illinois Department of Transportation, Office of Program Development; and the US Department of Transportation, Federal Highway Administration.
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Published In
Structures Congress 2019: Bridges, Nonbuilding and Special Structures, and Nonstructural Components
Pages: 57 - 67
Editor: James Gregory Soules, McDermott International
ISBN (Online): 978-0-7844-8223-0
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Apr 22, 2019
Published in print: Apr 22, 2019
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