Presented in this paper is a new, unique and innovative composite cold formed steel floor system developed by iSPAN Technologies, called the "iSPAN Composite Floor System". The joist sections are fabricated by fastening two cold-rolled flange chord elements with cold-driven rivets to a flat web element. This makes it possible to create a section where the flange chord elements can be of a different steel thickness with respect to the web element, resulting in a most efficient structural cross section and numerous design alternatives. The joist sections have lip-reinforced web openings spaced at 4 ft o.c. along the joist length to accommodate the usual service items. The joists are typically spaced 4 ft o.c. with a 7/8 in. corrugated steel deck spanning between the joists to support the concrete during casting. Featured in this paper are the results from push-out tests that have been carried out to establish the interlocking capacity of the concrete with the top chord of the joist section. The results of a full-scale laboratory structural test are also presented to substantiate the calculated strength and stiffness characteristics. Finally, the results of a field test during construction are presented.
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