TECHNICAL
SUMMARY OF THE RESULTS
The reference test with direct loading followed
the outcome of the preliminary tests. The initial
stiffness of the specimens with surface corbel
was similar to what was experienced in direct
loading (Figure 7). When the slip exceeded
approx. 0.4 mm where shear stress development
stopped with directly loaded specimens, the
stress development continued until the end of
the test (30 mm). The shear stress development
with the surface corbel type can be assumed to
be resulting from the corbels rotating due to the
eccentric loading and causing a compression
zone on the bottom end of the corbel. The slip
reading includes also the deformations of the
corbel but based on the low final deformations
in the vertical direction, this can be ignored and
slip readings of directly loaded specimens and
specimens with surface corbel compared.
direct loading
Shear stress
0 1 2 3 4 5 6 7 8 9 10
Slip mm
surface corbel
FIGURE 7 CHARACTERIZED STRESS SLIP CURVE OF THE SPECIMENS WITH DIRECT LOADING AND THE
SURFACE CORBEL TYPE
42 PEIKKO CONNECTIONS 1/2021