Strength of Composite Beams with Web Openings

by David M. Todd, (A.M.ASCE), Design Engr.; Marley Cooling Tower Co., Mission, Kansas; formerly, Research Asst., Dept. of Civ. Engrg., Kansas State Univ., Manhattan, Kans.,
Peter B. Cooper, (F.ASCE), Prof.; Dept. of Civ. Engrg., Kansas State Univ., Manhattan, Kans.,


Serial Information: Journal of the Structural Division, 1980, Vol. 106, Issue 2, Pg. 431-444


Document Type: Journal Paper

Abstract: An ultimate strength analysis of composite beams with unreinforced, rectangular web openings is presented. The analysis is developed for general beam geometry and material properties, and for a single web opening of any practical depth, width and location. The beneficial effects of strain hardening and the shear contribution of the slab are neglected, and a four hinge failure mechanism at the opening is assumed. Analytical results indicate that a composite section with a web opening has a significantly higher bending strength than the corresponding noncomposite section, and that variations in opening length, height and eccentricity can have a significant effect on the ultimate strength. Comparison of the analytical results with the limited experimental data available indicates that the theory provides a very conservative estimate of the ultimate strength. The discrepancy between theory and test results is attributed primarily to strain hardening and the shear contribution of the slab.

Subject Headings: Composite beams | Structural strength | Ultimate strength | Web beams | Webs (structure) | Strain

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