The Structural Engineer > Archive > Volume 46 (1968) > Issues > Issue 9 > Effective Widths of Composite Beams of Steel and Concrete
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Effective Widths of Composite Beams of Steel and Concrete

The work described in this paper provides a rational basis for the determination of effective widths taking the parameters relevant to the geometry and materials properties in the section into account, assuming the absence of slip between the steel joist and the concrete slab. Harmonic series solutions are employed in the determination of effective widths for various side ratios of the slab and various ratios of the slab thickness to the depth of the steel beam. These solutions incorporate the variation of the neutral axis depth across the width of the wide concrete flange due to shear lag effect. Three standard steel sections were used as the basis of the computations. A general computer program that requires the dimensions of the steel joist and the slab has been developed. The case considered is that of a simply supported symmetrically loaded system of a slab spanning several equally spaced identical steel ribs. The loading consists of central point loads on all ribs, the dead load of the composite section being taken into account in the computations. A.O. Adekola

Author(s): Adekola, A O

Keywords: composite construction;beams;effective widths;analysis;slabs;thickness