# Performance-Based Analysis of Single-Layer Cylindrical Steel Reticulated Shells in Fire
## 7 Conclusions  
This paper presents a comprehensive case analysis of the fire performance of single-layer cylindrical reticulated shells. Nonuniform fire temperature fields of single-layer cylindrical reticulated shells under different fire scenarios were generated using a Fire Dynamics Simulator (FDS). A performance-based analysis of single-layer cylindrical steel reticulated shells during a fire was carried out. The primary findings can be summarized as follows:  
Figure 26: Time-history curve of vertical displacement (influence of fireproof coating).  
Figure 25: Time-history curve of vertical displacement (influence of the roof loads).  
1. This paper compared the FDS simulation and fire test results. It is can be seen that the numerical simulation and test results are relatively similar. Therefore, the accuracy and reliability of the simulation method can be verified.  
2. The temperature field of the fire scenarios simulated by FDS shows that the space above the fire source area had the highest temperature, and gradually reduced for the spaces away from the fire source. The location of the fire source has considerable influence on the temperature field within the structures, especially the distribution of the high-temperature areas. The temperature field is non-uniform within the reticulated shell structure. For three different fire scenarios, the highest fire temperatures were above 600 \({}^{\circ}\)C. The high temperature of this localized area is detrimental to the overall fire resistance of the structure.  
3. Comparing the three fire conditions above, it can be concluded that the maximum nodal displacement of the reticulated shell was basically the same with the different fire conditions. The fire resistance limit of the structure decreases with an increase in fire source power. When the fire source was at the midpoint or in the corner of the longitudinal side, the reticulated shell was destroyed at the beginning of the fire. The fire resistance limit of the reticulated shell reduced by 70%.  
4. In order to enhance the fire resistance of large-span steel reticulated shells, the following suggestions are proposed: (a) increase the size of the members and the thicknesses of the protective layer of the tubes. (b) Reduce the roof loadings of the reticulated shells. (c) Avoid piling combustible goods near the corner of reticulated shells during service period of the structure.  
5. This research presented a comprehensive demonstration to show how fire resistance of a large-span steel reticulated shells can be assessed based on performance-based fire design approach step-by-step. The information presented in this paper is useful for practical structural engineers for conducting the fire resistance design of complex large-span steel reticulated shells.  
Conceptualization, Z.Y. and C.L.; methodology, C.L.; investigation, Y.Z.; writing--review and editing, Z.Y. and Y.Z.; All authors have read and agreed to the published version of the manuscript.  
This research is supported by the National Natural Science Foundation of China (51778157), the Guangzhou Civic Bureau of Education (1201581640) and the Foundation for Fostering the Scientific and Technical Innovation of Guangzhou University.  
The authors declare no conflict of interest.