## 6 Conclusions
It can be seen that, especially in the later phase of monitoring, the developed numerical model Precon3D gives the best agreement of the results with the experimental one, which can be very important for computer simulation of structural monitoring. In the second example, a reinforced concrete slab was loaded 90 days after correcting was analysed, and its behaviour was monitored for the next 365 days. The analysis of this example with the Precon3D program shows a very accurate calculation of nonlinear creep caused by high-stress levels in the slab and further propagation of cracks in the tensile zone of concrete. Moreover, the numerical results obtained by Precon3D follow the measured results very well for all measuring positions. The third example analyses the behaviour of the reinforced concrete beam, where the influence of shrinkage on the behaviour of concrete and reinforcement is analysed. The results obtained in the numerical simulation by Precon3D agree with the theoretical logic of the influence of shrinkage on the behaviour of concrete and reinforcement. It has been noticed that shrinkage has a certain influence on the behaviour of reinforcement, so it should not be neglected in the long-term analysis. As concluded from the analysis of numerical results, the concrete shrinkage deformation represents the nature of concrete behaviour and cannot be treated as 'classical' deformation (does not cause stress change in concrete), such as that caused by an external load. The Precon3D numerical program is designed to leave users with the choice of conducting short-term or long-term analysis. If it is a long-term analysis, then there is a possibility to analyse only shrinkage, only creep, or both creep and shrinkage of concrete. In the analysis of concrete shrinkage, it is possible to perform the total shrinkage analysis as the sum of autogenous shrinkage and shrinkage during drying or only the analysis of shrinkage by drying. Most computer programs/numerical models for 3D nonlinear analysis of reinforced concrete structures for short-term and especially long-term analysis require many specific parameters, so the main advantage of this model is that it can perform 3D nonlinear material analysis for short-term and long-term loading of reinforced concrete structures using basic material parameters obtained by uniaxial testing. The presented numerical model is reliable and applicable for monitoring structures even at high-stress levels, i.e., nonlinear creep. Conceptualization, A.D2. and A.H.; methodology, A.D2. ; software, A.D2., M.G. and A.H.; validation, A.D2. ; formal analysis, A.D2., M.G. and A.H.; investigation, A.D2. ; resources, M.G. and A.H.; data curation, A.D2., M.G. and A.H.; writing--original draft preparation, A.D2. ; writing--review and editing, M.G. and A.H.; visualization, A.D2., M.G. and A.H.; supervision, M.G. and A.H.; project administration, M.G. and A.H.; funding acquisition, M.G. and A.H. All authors have read and agreed to the published version of the manuscript. **Funding:** This research received no external funding. **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. **Acknowledgments:** This research is partially supported through project KK.01.1.1.02.0027 co-financed by the Croatian Government and the European Union through the European Regional Development Fund--the Competitiveness and Cohesion Operational Programme. **Conflicts of Interest:** The authors declare no conflict of interest.