Flexural Capacity of Compact Composite I-Girders in Positive Bending
Publication: Journal of Bridge Engineering
Volume 14, Issue 4
Abstract
Current American Association of State Highway and Transportation Officials (AASHTO) bridge specifications for compact composite steel girders in positive bending with adjacent compact pier sections limit the allowable maximum strength to a value between the full plastic moment and the hypothetical yield moment of the cross section as a function of the depth of web in compression. The strength prediction equations derived using these methods provide conservative values when compared to the results of the parametric studies used to develop the equations. Recent experimental tests coupled with finite-element analysis and mechanistic evaluations of the cross-section flexural capacity suggest that larger capacities may be achieved than those determined from AASHTO’s prediction equations. This paper presents an assessment of the behavior of composite positive bending specimens. A summary of a comprehensive literature review is provided coupled with results of the analytical and experimental evaluation of the nominal moment capacity of composite girders. Lastly, a less conservative design moment capacity expression developed from this assessment is provided.
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References
AASHTO. (2001). LRFD bridge design specifications, 2nd Ed., Washington, D.C.
AASHTO. (2003). LRFD bridge design specifications, 3rd Ed., Washington, D.C.
Ansourian, P. (1982). “Plastic rotation of composite beams.” J. Struct. Div., 108(3), 643–659.
Mans, P. H. (2001). “Full-scale testing of composite plate girders constructed using high performance steel.” MS thesis, Univ. of Nebraska–Lincoln, Lincoln, Neb.
Roberts, N. R. (2004). “Evaluation of the ductility of composite steel I-girders in positive bending.” MS thesis, West Virginia Univ., Morgantown, W.Va.
Vasseghi, A. (1989). “Strength and behavior of composite plate girders under shear and bending moment.” Doctoral dissertation, Univ. of Texas-Austin, Austin, Tex.
West Virginia Department of Transportation, Division of Highways (WVDOH). (1999). Standard bridge plans, standard details book, Vol. 3, Charleston, W.Va.
Wittry, D. M. (1993). “An analytical study of the ductility of steel-concrete composite sections.” MS thesis, Univ. of Texas–Austin, Austin, Tex.
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© 2009 ASCE.
History
Received: Aug 10, 2006
Accepted: Jul 9, 2008
Published online: Jun 15, 2009
Published in print: Jul 2009
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