The longitudinal shear bond behavior of an innovative laminated fiber reinforced composite slab

Composite slabs with ordinary concrete and typical profiled steel sheeting are widely used in construction industry due to their obvious advantage in casting as well as in structural performance. This paper proposes a new laminated pouring technique, and presents a series of full-scale tests conducted on a new type of composite slab produced using both lightweight aggregate concrete and polymer fiber reinforced lightweight aggregate concrete with a closed-type (non-embossed dovetailed) steel sheeting profile (LFRCS). A total of 12 simply supported specimens were tested to investigate the structural behavior of this new type of composite slab with special emphasis on the lamination thickness. Test results were used to obtain an effective range for the laminated pouring technique. It was observed that plane cross-sections remain plane in LFRCSs but the longitudinal shear bond strength dominates the failure mode regardless of lamination thicknesses. In addition to linear regression methods and PSC based methods that are typically used for accessing the longitudinal shear bond strength for composite slabs with normal weight and lightweight concretes, rational modifications and relevant formulas for the specified LFRCS configurations including the effects of tensile reinforcement have been proposed. Results predicted using the proposed analytical techniques were compared those obtained experimentally, and the comparison showed good agreement.