Experimental Tests on Hollow Core Slabs Made with FRC - On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete - page 129

7.3.1.2 Flexure Failure Mode (F)

For the higher a/d ratio in Series II (a/d = 8.6), several exure cracks developed

vertically toward the top of the HCS, and one of these cracks continued to grow
until a

fl

fl exure failure (Fig. 7.8 ) took place.

7.3.1.3 Failure on Anchorage of Prestressing Strands (A)

During the tests, slippage on strands (Figs. 7.9 and 7.10 ) was also detected and, in
most cases, this led to a diagonal crack.

7.3.2 Load-De fl ection Response

Figure 7.11 plots the de fl ection on the mid-span for the most representative HCS of

series I.
As expected, HCS I-50-3.1 failed through anchorage and the failure was brittle.
All the other HCS failed through shear- exure and showed a ductile failure. The

maximum load increased when shear span diminished. HCS with bers exhibited
greater shear capacities.
In Figs. 7.12 , 7.13 and 7.14 , the load-de

fl

fl ections curves of Series II are plotted

and classi bers amount according to the shear span (a/d) ratio. Three

behaviors are distinguished. HCS with a/d = 2.3 accomplished the greatest loads
with brittle failure through a diagonal shear (S).

ed by

Fig. 7.8 Flexure failure