## 4 Conclusions  
This new parametric numerical model made it possible to evaluate the general influence of the variation in geometric dimensions associated with structural wooden support elements with gypsum board protection in an easy way when compared to the experimental methodologies used. It was possible to analyze the evolution of the temperature inside the cavity and approximate this value closer to that obtained in experimental methodology, using an additional finite element. This procedure could be used for any other simulations to calculate the fire resistance in these types of structures.  
This analysis followed a fire resistance methodology using the thermal insulation criterion. It is concluded that the evolution of fire resistance, when studying the distance between wood centers, appears practically linear, with only a small variation. Regarding the height and width of the wood, both parameters do not verify linearity, as the existing variation differs from what is expected.  
Likewise, when comparing the models for studying gypsum board thickness, there is a greater divergence, with the evolution observed in the numerical simulation being much  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Model** & **Fire Resistance, min** \\
**[H \(\times\) W + Tg] \(\times\) D** & \\ \hline \([70\times 30+12.5]\times 600\) & 70.2 \\ \hline \([70\times 30+12.5]\times 500\) & 70.9 \\ \hline \([70\times 30+12.5]\times 400\) & 71.8 \\ \hline \([90\times 30+12.5]\times 400\) & 73.2 \\ \hline \([120\times 30+12.5]\times 400\) & 75.7 \\ \hline \([120\times 40+12.5]\times 400\) & 77.7 \\ \hline \([120\times 50+12.5]\times 400\) & 78.9 \\ \hline \([120\times 50+15]\times 400\) & 105.2 \\ \hline \([120\times 50+25]\times 400\) & 253.5 \\ \hline \hline \end{tabular}
\end{table}
Table 5: Fire resistance, thermal insulation criterion.  
higher than expected. Additionally, it is possible to assess the importance of the parameters in the performance of the constructive solution.  
Therefore, it is concluded that the increase in gypsum board thickness is the parameter with the greatest preponderance in fire resistance, as it causes the greatest variation. The second parameter, with the greatest positive impact on fire resistance, is the height of the wood, followed by the wood width.  
Finally, the parameter with less significant importance concerns the variation in the distance between wooden beam centers, given that increasing it causes a very small increase in the performance of the constructive solution. The numerical model was validated and developed by the finite element method and can be used for another type of constructive model to assess fire resistance.  
Future work intends to investigate the effect of different types of insulation and thickness layers, under the constructive element under fire, in the assessment of the residual cross-sections. Additionally, to include steel connections in the assembly parts of the constructive model and verify the effect on fire resistance. Furthermore, the effect of internal protection inside the air cavity will be another study to consider. With different results, Different results could aid in finding a simplified and analytical model that can predict all these combinations.  
Conceptualization, E.M.M.F.; methodology, M.O.; validation, D.P., investigation, D.P.; writing--original draft preparation, E.M.M.F.; writing--review and editing, E.M.M.F. and M.O.; supervision, E.M.M.F. 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 are contained within the article.  
The authors declare no conflicts of interest.