Abstract: “In this research, six large-scale composited metal deck (CMD) slabs were constructed and tested in a cantilever diaphragm configuration to assess the viability of using discreet macro fibers as an alternative secondary reinforcement. Two common commercial steel deck types, Holorib and Ribdeck AL, with a reentrant and trapezoidal profile; respectively, were used in this study. Three types of secondary reinforcements were considered: (1) Conventional welded wire mesh of sizes A142 and A98; (2) synthetic macro-fibers at the dosages of 3 kg/m3 and 5.3 kg/m3; and (3) hooked-end steel fibers with a dosage of 15 kg/m3. All the slabs were tested in the weak configuration, a condition that practically exists between steel decks and primary steel beams. Test results showed that although fibers and WWM are theoretically used in CMDs to control cracks associated with shrinkage and temperature changes, they actually have a considerable effect on enhancing the horizontal shear capacity. Results indi”

Keywords: Decking, composite slab, fiber-reinforced concrete, diaphragms, horizontal shea