Cross-Frame Diaphragm Bracing of Steel Bridge Girders [Final Report]

Winters, Erika L.; Baghernejad, Soudeh; Roddis, W. M. Kim; University Transportation Centers Program (U.S.); Kansas State University

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Cross-Frame Diaphragm Bracing of Steel Bridge Girders [Final Report]

2008-01-01
By Winters, Erika L. ; Baghernejad, Soudeh ; Roddis, W. M. Kim

[PDF-2.05 MB]

English

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Details:

Creators:

Winters, Erika L. ; Baghernejad, Soudeh ; Roddis, W. M. Kim

Winters, Erika L. ; Baghernejad, Soudeh ; Roddis, W. M. Kim Less -
Corporate Creators:

University Transportation Centers Program (U.S.) ; Kansas State University

University Transportation Centers Program (U.S.) ; Kansas State University Less -
Corporate Contributors:

Kansas. Dept. of Transportation. Bureau of Materials & Research
Subject/TRT Terms:

[+]

Bracing Bridges And Other Structures Construction Design Diaphragm Walls Girder Bridges Highways I24: Design Of Bridges And Retaining Walls I53: Construction Of Bridges And Retaining Walls Retaining Walls Steel Bridges
Publication/ Report Number:

K-TRAN: KU-01-2
Resource Type:

Tech Report
Geographical Coverage:

Kansas ; United States

Kansas ; United States Less -
TRIS Online Accession Number:

01100250
Edition:

Final Report
Corporate Publisher:

University of Kansas. Transportation Research Institute
Abstract:

Steel plate girder bridges make use of traditional cross-frame diaphragms to stabilize the compression flange of girders. These braces are required during construction, especially during deck placement, to prevent lateral torsional buckling of bridge girders. Girder buckling capacity is a function of cross-frame diaphragm spacing as well as strength and stiffness. Recent developments in bridge design may cause the governing girder limit state to shift from one of strength to one of stability. These developments include the elimination of in-plan bracing, composite girders, high performance steels, and phased deck replacements. In addition, the American Association of State Highway and Transportation Officials (AASHTO) has changed its code requirement for cross-frame diaphragm spacing in the 1998 AASHTO LRFD Bridge Design Specifications. The requirement for 25-foot maximum brace spacing has been removed. The current requirement is for a "rational analysis" to determine cross-frame diaphragm spacing. Explanations of the problems these changes cause in design are discussed. A case study is presented of a bridge that suffered construction difficulties during deck placement. This investigation found that the cross-frame diaphragms were not stiff enough to brace the plate girders during the deck placement. Suggestions are given as to an efficient, economical design and spacing for cross-frame diaphragms on plate girder bridges.
Format:

PDF
Funding:

C1268
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:301e0a6a4964e52e2fd35ce0048f0f27ee00b34fd39323cd347fb74ef926ba63
Download URL:

https://rosap.ntl.bts.gov/view/dot/40192/dot_40192_DS1.pdf
File Type:

No Additional Files

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Cross-Frame Diaphragm Bracing of Steel Bridge Girders [Final Report]

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