Issue 42

W. De Corte et alii, Frattura ed Integrità Strutturale, 42 (2017) 147-160; DOI: 10.3221/IGF-ESIS.42.16 155 (a) (b) Figure 14 : Debonded surfaces specimen 2-S-C: steel side (a) and concrete side (b) . Test specimen F m [kN] τ m [MPa] s m [mm] 0-0-0 115 (21) 1.51 (0.28) 0.02 (0.01) 1-S-0 222 (45) 2.92 (0.59) 0.05 (0.03) 1-R-V-a 214 (44) 2.82 (0.57) 0.01 (0.01) 1-R-H-a 227 (29) 2.99 (0.38) 0.01 (0.01) 1-R-V-b 177 (49) 2.33 (0.64) 0.02 (0.01) 1-R-H-b 207 (53) 2.73 (0.70) 0.02 (0.02) 2-S-c 353 (85) 4.65 (1.12) 0.03 (0.01) Table 3 : Results (mean value and STDEV) of push-out tests. Figure 15 : Results of push-out tests (graphical representation). Tab. 3 and Fig. 15 summarize the mean values and standard deviations (STDEV) of the failure load F , the shear bond stress τ n , and the according maximum relative slip s m for the different push-out specimens. In this, the average shear bond stress is given by Eq. 7. 2 200 190 n F F A      [N/mm 2 ] (7) From the values of Tab. 3 and Fig. 15 it can be concluded that the application of an epoxy adhesive layer improves the shear bond strength between steel plates and concrete. In addition, that test specimens 1-S-0 show a mean bond strength similar 1,51 2,92 2,82 2,99 2,33 2,73 4,65 0,00 3,00 6,00 Mean shear bond stress [MPa]