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EFFECTIVE SLAB WIDTH FOR COMPOSITE
STEEL BRIDGE MEMBERS
SUMMARY 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.
