## 4 Results
### Experimental Analysis
#### 4.1.2 TGIB-gf  
Figure 22 shows the mid-span force-displacement curves for TGIBs with annealed float glass and heat-strengthened float glass [18]. Figure 22: Beam tests TGIB-fg [18] (E—epoxy (3M DP490), S—silicone (Sika Sil SG500), A—acrylate (Sika Fast 5215) adhesive; AF annealed, HS heat strengthened float glass). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Specimen** & **F\({}_{\text{cr}}\)** = F\({}_{\text{max}}\) [kN]** & **u\({}_{\text{cr}}\)** = u\({}_{\text{max}}\) [mm]** & **EI [MNm2]** \\ \hline S\_FT\_01 & 20.0 & 47.4 & 0.604 \\ S\_FT\_02 & 18.5 & 43.9 & 0.603 \\ S\_FT\_03 & 19.8 & 52.8 & 0.537 \\
**Mean value** & **19.4** & **48.0** & **0.594** \\ A\_FT\_01 & 24.9 & 39.2 & 0.909 \\ A\_FT\_02 & 28.8 & 48.5 & 0.850 \\ A\_FT\_03 & 26.5 & 40.5 & 0.936 \\
**Mean value** & **26.7** & **42.7** & **0.898** \\ E\_FT\_01 & 19.0 & 30.1 & 0.905 \\ E\_FT\_02* & / & / & / \\ E\_FT\_03 & 27.8 & 45.6 & 0.872 \\
**Mean value** & **23.4** & **37.9** & **0.889** \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Results of measurements TGIB-fw for fully tempered glass (FT) with q = 1.0 and d = 1.0. In Table 9 results of measurements of TGIB-gw with annealed float glass are given. These experimental studies of TGIBs-gf show results from specimens with epoxy adhesives. They show similar behaviour to TGIBs-fw with annealed float glass, i.e., the fracture values are much higher than the appearance of the first cracks in the glass. In the case of heat-strengthened TGIB-gf (Table 10), brittle fracture occurred without a warning signal despite the much higher load-bearing capacity. The maximum displacements (umax) are also quite similar. They average 41 mm for the silicone-bonded specimens, 40.6 mm for the acrylate-bonded specimens and at least 40.2 mm for the epoxy-bonded specimens. Again, it is expected that the flexural stiffness values are highest for the epoxy-bonded specimens, followed by acrylate and finally silicone. Comparing the results of measurements between TGIB-fw and TGIB-gf with annealed float glass with epoxy adhesive (Table 11), we found that the average value of forces at the first crack (F\({}_{\text{cr}}\)) are 1 kN higher for TGIB-gf than for TGIB-fw, and the maximum forces (F\({}_{\text{max}}\)) are 4.3 kN higher. The average value of maximum displacements was also higher for TGIB-gf for 8.9 mm. However, we were surprised by the results for ductility, which was also higher for TGIB-gf, while bending stiffness was almost the same for both groups of specimens. In Table 11 we see that the average values of the maximum forces are very comparable. However, the bending stiffness is expected to be higher for TGIB-gf. \begin{table}
\begin{tabular}{c c c c} \hline
**Specimen** & **F\({}_{\text{cr}}\)** = **F\({}_{\text{max}}\)** [kN]** & **u\({}_{\text{cr}}\)** = **u\({}_{\text{max}}\)** [mm]** & **EI [MNm2]** \\ \hline S\_HS\_01 & 20.2 & 42 & 0.878 \\ S\_HS\_02 & 19.3 & 40 & 0.880 \\
**Mean value** & **19.8** & **41** & **0.879** \\ A\_HS\_01 & 25.1 & 39.1 & 1.171 \\ A\_HS\_02 & 25.2 & 42 & 1.095 \\
**Mean value** & **25.2** & **40.6** & **1.133** \\ E\_HS\_01 & 26.2 & 42 & 1.138 \\ E\_HS\_02 & 24.7 & 38.4 & 1.174 \\
**Mean value** & **25.5** & **40.2** & **1.156** \\ \hline \end{tabular}
\end{table} 
Table 10: Results of measurements TGIB-gw with heat strengthened float glass—HS (E—epoxy, S—silicone, A—acrylate).