UNDERSTANDING COMPOSITE BEAM DESIGN METHODS USING LRFD.

Abstract

This paper presents a very brief review of practical procedures toward a better understanding of the Load Resistance Factor Design (LRFD) Composite-Beam Design method. Particular attention was placed on those conditions where concrete strength might control and would not be covered by the LRFD Manual techniques. A second important aspect is the development of an optimization model that provides an equivalent-beam weight technique for selection of minimum cost, composite-design alternatives. Sensitivity checks of this model suggest little variation in cost-oriented choices for spans above 30 ft where 50% or more composite action is utilized.