Experimental Tests on Fibers Influence on the Size Effect on Shear - On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete - page 84

widths) to the horizontal. This inclination was based on experimental observation of
similar tests [ 3 ], in which the critical shear crack occurred at a distance of about the
effective depth (d) from the support, directed towards the point of load application.
The instrumentation applied in the shear span for beams H1000 and H1500 (see
Fig. 5.13 ), was slightly different from the beams H500, due to their increased shear
span area. Thus, in all beams were disposed 2 potentiometric transducers for
measuring strut displacements on the front side of the beam and, also, transducers
for measuring crack widths on the shear span. The latter on the following: 4
transducers (2 on the front and 2 on the back side) in H500 beams and 6 (4 on the
front and 2 on the back side) in H1000 and H1500 beams.
Figure 5.14 shows a front view of a H1000 beam before testing.
Fig. 5.13 Instrumentation details for beams H1000 and H1500