Composite Beam Criteria in LRFD

Methods are proposed for the computation of flexural strength of composite beams and for design of shear connectors based on limit states of plastic strength. Both fully and partially composite beams with formed steel deck or flat soffit slabs are considered. LRFD resistance factors are derived using a first-order second-moment probability analysis. Linear plastic strength equations for partially composite beams and a direct design procedure for the steel section and shear connectors are presented. Also treated are effective slab width, beams under construction, and approximate formulas for effective moment of inertia and section modulus of partially composite beams.