Experimental Tests on Hollow Core Slabs Made with FRC - On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete - page 120

Fig. 7.1 Cross-section of HCS. Dimensions in millimeters

[ 1 ]. A different reinforcement, characterized by the number and diameter of wire or
strand, its position and pretension (Fig. 7.1 and Table 7.1 ), was tested in each
Series. In Table 7.1 ,

is the prestressing tension applied prior to
discounting prestressing losses; r inf is the cover on the bottom reinforcement;

“ Initial tensile ”

ρ l is

the longitudinal reinforcement ratio (wires or 7-wire strands in this case) and ˃ c is

the average stress acting on the concrete cross-section due to the prestressing axial
force, including prestressing losses.