Abstract
The analysis of a composite member is often not based on the gross cross-sectional proportions. In reinforced concrete design, it is common to consider only the effective width of a T-beam, while in slender steel plate structures the effective width is again commonly used. In composite construction, both steel and concrete are used, and so effective widths are often specified for the concrete component as well as for the steel component. The effective width treatment of the concrete component arises primarily from the effects of shear lag, while that in the steel component arises mainly from the effects of local buckling. Both of these phenomena are nonlinear, and simplifications are fortunately available for transforming the nonlinearities into a form suitable for a linear analysis. This transformation is possible by considering the effective size of a composite member, obtained from the effective widths of the concrete and steel components.
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