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Accession Number PB2013-109672
Title Skewed Highway Bridges.
Publication Date Jul 2013
Media Count 193p
Personal Author G. Fu P. J. Chun
Abstract Many highway bridges are skewed and their behavior and corresponding design analysis need to be furthered to fully accomplish design objectives. This project used physical-test and detailed finite element analysis to better understand the behavior of typical skewed highway bridges in Michigan and to thereby develop design guidelines and tools to better assist in routine design of these structures. It is found herein that the AASHTO LRFD Bridge Design Specifications' distribution-factor analysis method is generally acceptable but overestimates the design moment for the typical Michigan skewed bridge spans analyzed herein and sometimes underestimates the design shear. Accordingly, a modification factor for possible shear underestimation based on detailed finite element analysis is recommended for routine design. Furthermore, the AASHTO specified temperature load effect is found to be relatively significant, compared with live load effect and should receive adequate attention in design. On the other hand the influence of warping and torsion effects in the analyzed typical Michigan skewed bridges is found to be small and negligible for the considered cases of span length, beam spacing, and skew angle. Based on these findings, the AASHTO distribution-factor analysis method is recommended to be used beyond the MDOT current policy of 30O skew angle limit for refined analysis, provided that the recommended modification factor C is applied and if the structure type, span length, beam spacing, and skew angle are within the ranges of the analyzed spans covered in this report.
Keywords 3D analysis
Bridge design
Construction engineering
Curved steel girder bridges
Girder bridges
Skewed steel girder bridges
Steel bridges
Structural analysis

Source Agency Federal Highway Administration
NTIS Subject Category 50A - Highway Engineering
91B - Transportation & Traffic Planning
46E - Structural Mechanics
50C - Construction Equipment, Materials, & Supplies
Corporate Author Wayne State Univ., Detroit, MI. Dept. of Civil and Environmental Engineering.
Document Type Technical report
Title Note Final rept. 12 Jul. 2007-30 Sep. 2013.
NTIS Issue Number 1325
Contract Number DOTFHA-2006-0413

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