## 5 Conclusions  
1. The most significant factors affecting the bearing capacity of a dapped-end beam were found to be the amount of shear reinforcement and the height of the dap, whereas the concrete strength had the least impact.
2. The parametric analysis comparing analytical and numerical methods showed that the EC2 STM method yields the highest bearing capacity estimates. However, ST models require proper adjustments to accurately capture acting forces in analyzed zones, and they should primarily be used for designing or as a baseline to be modified for configuration-specific analyses. The PCI method is less conservative, and the [PERSON] et al. method demonstrates the best correlation with the numerical model. The EC2 6.2 section often overestimates shear strength, making it less suitable for dapped-end beam design.
3. The results of the numerical parametric analysis revealed the significant effects of prestressing in certain dapped-end configurations. Prestressed reinforcement compressing the dap wall reduced resistance to cracking at the re-entrant corner, with severity depending on the prestressing intensity. A 50% reduction in cracking load was observed at a compressive stress ratio of 0.20-0.25. With higher prestressing, cracks appeared in the re-entrant corner before the external load exposure.
4. When the prestressed reinforcement compressed the wall of the dap, the induced tensile stresses reduced the bearing capacity of the dapped-end beam. The significance of this effect was dependent on the intensity of the prestressing. A decrease of up to 8.81% in the bearing capacity was observed in the conducted analysis.
5. The proposed analytical model for the assessment of the bearing capacity reduction caused by prestressing in dapped-end beams proved to be in good correlation with the results of the numerical model.
6. The results of this study indicate that if prestressed reinforcement is used in the design of dapped-end beams and it is not possible to extend the tendons to the end of the nib above the dap, then it is essential to assess the reduction of the bearing capacity and implement strategies to mitigate cracking in the re-entrant corner.  
Although this study offers insights into dapped-end beam parameters and the impact of prestressing, further research is necessary to comprehensively understand prestressed dapped-end beam behavior with various cross sections and parameters. There is a shortage of methods for designing prestressed dapped-end beams and calculating failure loads considering prestressing effects. This study can serve as a foundation for future research and the development of design methods and calculation models in this area.  
Conceptualization, J.V.; data curation, V.M.; formal analysis, V.M. and A.M.; funding acquisition, J.V.; investigation, V.M.; methodology, V.M., A.M. and J.V.; project administration, A.M. and J.V.; resources, A.M. and J.V.; software, V.M.; supervision, A.M. and J.V.; validation, V.M., A.M. and J.V.; visualization, V.M.; writing--original draft, V.M.; writing--review and editing, V.M., A.M. and J.V. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
Data Availability Statement: Data sharing is not applicable to this article.  
The authors declare no conflict of interest.