Composite Beams and Joists

by W. Samuel Easterling, Virginia Polytechnic Inst and State, Univ, Blacksburg, United States,
David R. Gibbings, Virginia Polytechnic Inst and State, Univ, Blacksburg, United States,
Thomas M. Murray, Virginia Polytechnic Inst and State, Univ, Blacksburg, United States,



Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation

Abstract:

Composite beams and joists used as flexural members in multistory steel-frame buildings are considered. Research results have shown that present design values for headed shear studs, used with the steel deck profile oriented transverse to the beam, may not be accurate for certain configurations. The influence that headed shear studs have on the flexural strength of composite beam or joist floor systems has been studied. The strength and load-displacement behavior of shear studs are influenced by the position of the stud relative to the stiffening rib in the bottom flange of the steel deck profile, the material properties of the deck and the length of the shear stud. Results are presented from both push-off and full-size beam and joist tests. Comparisons are included that show the discrepancy between the predicted and experimental strengths of the beam tests based on the current code provisions. Additionally, the usefulness of push-off test results in predicting the strength of beam tests is highlighted.

Subject Headings: Composite beams | Steel frames | Joists | Studs | Steel structures | Steel decks | Structural strength

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