## 4 Conclusions  
Based on the results of the numerical simulations obtained in this article, the following conclusions are drawn:  
* Steel-reinforced concrete (SRC) structures double the ductility compared to the reinforced concrete (RC) structures, where a break prevented greater strains being reached. \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **Frame A** & **Frame B** & **Frame C** & **Frame D** \\ \hline Displacement node 14 (m) & 1.3 & 2 & 1.3 & 2 \\ Force node 14 (kN) & 75 & 160 & 160 & 160 \\ Absorbed energy from the horizontal load (kN-m) & 60 & 280 & 90 & 280 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Summary table of the performed tests. It was possible to simulate the elastoplastic or post-critical behavior until a section broke. A drastic reduction in the moment that simulated the deterioration of concrete, breakage of reinforcements, and loss resistance of steel cross-sections has been included in the moment-curvature graph. * Hinges appeared simultaneously by redistributing forces along sections until collapse took place. * SRC structures reinforced only at joints reduced the steel cross-section used in the structure compared to reinforcing all the bars with equal strength, ductility, and safety against a structure collapsing during earthquakes. * Frame models with nonlinear moment-curvatures until the point of collapse were able to satisfactorily reproduce the behavior of three-dimensional models and the experimental test of the prototypes. The frame model was used to elucidate the hyperstatic behavior. It described the redistribution of strength and the structure's general behavior until a break occurred. It provides designers with a much simpler tool than the complete three-dimensional modeling of the contributed structure. * It would be interesting to consider the generalization of the reinforcement with steel cross-sections embedded in the joint of reinforced concrete structures to achieve more earthquake-resistant structures, especially in public buildings and for emergencies where excellent seismic safety must be guaranteed. * In the reinforced concrete structures, it would be convenient to explicitly consider the possibility of including reinforcements of reinforced concrete joints with embedded steel cross-sections as a solution for creating structures with very high ductility using Eurocode 4 as the current regulation for designing structures with mixed steel and concrete. * The extension of Eurocode 4 would be interesting for designing reinforced concrete structures with joints having fully embedded steel cross-sections, and not only in columns, as contemplated by Japanese JIA(The Japan Institute of Architects) regulations. The design can be achieved by using moment-curvature graphs. * Simulation with numerical models allowed for the analysis of complex situations. In particular, the model of simplified frames with the relationship of moment-curvature allowed for nonlinear calculations until large displacements were reached, taking into account the reduction of rigidity because of the cracking of the concrete. * A new procedure was developed to obtain the moment-curvature graphs of the sections from the numerical models. The moment-curvature graph can be used in the simplified frame analysis by contemplating post-critical behavior in future research. * The principal scientific contribution is that, using the Ansys program, it was possible to numerically validate a procedure to simulate until the breaking of a bar structure from some bar elements with a behavior introduced by means of the moment-curvature graph. The behavior was the same independent of whether all the bars were reinforced or only the joints were reinforced. **Author Contributions:** Formal analysis, I.M., R.I., L.E. and I.V. ; Investigation, I.M. and R.I.; Writing--original draft, I.M. ; Writing--review & editing, I.M., R.I., L.E. and I.V. **Funding:** This research received no external funding. **Conflicts of Interest:** The authors declare no conflict of interest.