## 6 Conclusions  
From the obtained results, it can be concluded that the cross section plays an important role in TGIBs made of annealed glass. For TGIB-fw, the first crack occured at a load 50% or more higher than for TGIB-gf. From both studies we can conclude that the bottom flange acts as a crack bridge which, together with the uncracked compression zone of the beam, ensured that the beam could continue to carry the load.  
The timber-glass beam with fully tempered glass and heat-strengthened float glass failed immediately, but with a higher total load than the TG beams with annealed float glass. The results of the experimental analysis are very similar or almost identical for both cross sections (TGIB-gf and TGIB-fw). It can be concluded that the influence of the cross section is not as significant for these types of glass. Beams with cross-sections of heat-strengthened glass and fully tempered glass do not show any post-failure strength.  
For TGIB-fw, we compared the ductility across the three test groups. The highest values were expected for silicone, which was also the most elastic adhesive. The values for epoxy were the lowest as expected due to the stiffness of the adhesive. For TGIB-gf, only the results for epoxy adhesive could evaluated. Here the ductility was slightly higher compared to the ductility of the epoxy adhesive samples of TGIB-fw. The reasons for this can be found in the material properties of the epoxy adhesives used. It can be seen that the epoxy used in TGIB-gf was less rigid than the epoxy adhesive used in TGIB-fw. The TGIB-fw samples had slightly higher values for gamma coefficient, the highest values for both test groups were found for the specimens bonded with epoxy adhesive.  
Further research could include numerical modelling of TGIB-fw. Experimental studies on TGIB subjected to continuous long-term loading will be also interesting to investigate. This analysis would give us a more comprehensive insight into the behaviour of these beams, which are typically installed in buildings for a period of 50 years or more. Here, we could also investigate the influence of humidity and temperature, which would certainly yield interesting results. Then there is the area of vibrations, which is also an interesting research topic. In the future, life cycle analysis (LCA) could also be included, and testing could be carried out on test subjects using laminated glass.  
Conceptualization, M.D. and M.P.; methodology, M.D. and M.P.; software, M.D.; validation, M.D., M.P. and A.S.; formal analysis, M.D.; investigation, M.D. and A.S.; resources, M.D. and A.S.; data curation, M.D.; writing--original draft preparation, M.D.; writing--review and editing, M.D., M.P. And A.S.; visualization, M.D.; supervision, M.P. and A.S.; project administration, M.P. and M.D.; funding acquisition, M.P. All authors have read and agreed to the published version of the manuscript.  
This research received WoodWisdom-Net 2 research project LBTGC: URBAN WOOD, Wood based construction for multi-story, The potential of Application of Timber-Glass Composite Structures For Building Construction, no. 4302-7/2010/25, Acronym: LBTGC--Load bearing timber-glass composites.  
Not applicable.  
Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.  
The data presented in this study are available on request from the corresponding author.  
The authors declare no conflict of interest.