# Dynamic Response and Damage Characteristics of Large Reinforced Concrete Slabs under Explosion
## 4 Conclusions  
In conclusion, the dynamic response and damage characteristics of slabs (4 m \(\times\) 5 m \(\times\) 0.15 m) under the explosion of different TNT charges were determined. Based on the experimental and numerical results, the following conclusions can be drawn: Under the 0.5-1 kg TNT explosion, there were no obvious cracks or deformation of the reinforced concrete slab, and the explosion pressure, displacement, and acceleration changed with the change in TNT charge. Under the 20 kg TNT explosion, a 1020 mm \(\times\) 760 mm  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**D** & **P\({}_{0}\)/kPa** & **I\({}_{0}\)/kPa-ms** & **A** & \(\beta\) \\ \hline
0.2 & 1500 & 5000 & 11 & 1.25 \\
0.5 & 2201 & 10,000 & 11 & 1.25 \\
0.8 & 10,930 & 20,000 & 10 & 1.05 \\ \hline \hline \end{tabular}  
* Note: \(P_{0}\) is the overpressure asymptote of the _P–I_ curve corresponding to the damage degree \(D\); \(I_{0}\) is the impulse asymptote of the _P–I_ curve corresponding to the damage degree \(D\); \(A\) and \(\beta\) are component-related constants.  
\end{table}
Table 7: Pressure and impulse limits corresponding to different damage degrees *.  
Figure 13: The _P–I_ curves of a 4 m \(\times\) 5 m \(\times\) 0.15 m RC slab.  
explosion crater appeared on the top surface, and multiple cracks appeared on the bottom surface, with obvious bending as a whole, indicating moderate damage. When the TNT charge exceeded 35 kg at the explosion height of 1 m, the slab showed a completely ineffective damage response.  
Based on LS-DYNA software simulations and a verification test, _P-I_ curves for the 4 m \(\times\) 5 m \(\times\) 0.15 m RC slab were established successfully. According to the _P-I_ curves, the damage degree under different non-contact explosions could be obtained easily and quickly. Only the 4 m \(\times\) 5 m \(\times\) 0.15 m RC slab with a section reinforcement ratio of 1.2% was considered in this study. The results could provide a reference for damage investigations of other RC slabs with different dimensions, reinforcement ratios, and concrete strengths under other explosion conditions such as contact explosions, internal explosions, and multiple explosions. Therefore, in the next investigation, the influence of more factors on the damage characteristics of reinforced concrete slabs will be analyzed to establish a more comprehensive _P-I_ curve cluster. The _P-I_ curve cluster will be meaningful for the assessment and safety protection of RC slabs and even RC buildings.  
Conceptualization, J.Y. and S.D.; methodology, J.Y.; software, S.L. and G.Z.; validation, J.Y.; investigation, J.Y. and S.L.; data curation, S.L.; writing--original draft preparation, J.Y.; writing--review and editing, J.Y. and S.L.; supervision, P.Z.; project administration, P.Z. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The data used to support the findings of this study are available from the corresponding author upon request. The data are not publicly available due to privacy.  
Author [PERSON] was employed by the company Jiangxi Hongdu Aviation Industry Group Co. Ltd. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.