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Suggested Citation:"Summary." National Academies of Sciences, Engineering, and Medicine. 2005. Effective Slab Width for Composite Steel Bridge Members. Washington, DC: The National Academies Press. doi: 10.17226/13853.
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The objectives of this work were to (1) propose criteria for effective width and recommended specifications and commentary for effective width and (2) provide worked examples illustrating the use of those proposed new criteria. The principal focus was common slab-on-girder configurations. A new definition for effective width that accounts for the variation of bending stresses through the deck thickness has been needed. A finite element modeling approach was developed, corroborated with experimental data by others and by the authors, and applied to a suite of bridges designed according to industry guidelines. Effective widths accord- ing to the new definition were extracted from this finite element parametric study of the suite of bridges. Principal findings from the parametric study were as follows: (1) full width was typically acting “at cross sections where it is most needed,” i.e., where moments and hence performance ratios would be highest, and (2) where the effective width was less than full width at such cross sections, that cross section had consider- able excess flexural capacity. Draft criteria for effective width were developed by applying regression approaches in order to account for different subsets of the parameters varied in the extensive para- metric study of bridge finite element models. The effects of those criteria were assessed using the Rating Factor (RF) as the measure of impact. Based on the impact assess- ment, draft criteria based on using the full physical slab width were recommended and illustrated in the context of positive and negative moment region worked examples. SUMMARY EFFECTIVE SLAB WIDTH FOR COMPOSITE STEEL BRIDGE MEMBERS

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TRB’s National Cooperative Highway Research Program (NCHRP) Report 543: Effective Slab Width for Composite Steel Bridge Members examines recommended revisions to the American Association of State Highway and Transportation Officials’ specifications for the effective slab width of composite steel bridge members. The report’s recommended specifications are applicable to all types of composite steel bridge superstructures and are suitable for design office use. Accompanying CRP-CD-56 contains extensive supporting information, including the recommended specifications and design examples.

The supporting information associated with NCHRP Report 543 are available in an ISO format. Links to instructions on buring an .ISO CD-ROM and the download site for the .ISO CD-ROM are below.

Help on Burning an .ISO CD-ROM Image

Download the NCHRP CRP-CD-56.ISO CD-ROM Image

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