1. Introduction
2. Fire Resistance Analysis Procedure of Firewall Considering Explosive Effect
3. Example of Application
3.1 Target Structure
3.2 Scenarios Selection
3.3 Impact Analysis by Explosive Fragment
3.3.1 Mechanical material property
3.3.2 Load condition
3.3.3 Result
3.4 Thermal-Structural Response Analysis
3.4.1 Thermal mechanical property of the material
3.4.2 Thermal property
3.4.3 Load condition
3.5 Result
3.5.1 Comparison by the degree of damage
3.5.2 Comparison by fire exposure time
4. Conclusions
In the present study, the existing fire resistance evaluation method was supplemented, and advanced fire resistance evaluation methods and thermal-structural response analysis modeling techniques were presented.
A firewall panel with mineral wool, one of the materials of PFP, was selected as a target structure, and the impact analysis and the thermal-structural response analysis were performed to analyze thermal-structural characteristics by explosion damage.
A comparison of the fire-exposed and the non-exposed surface of the firewall panel showed that as the temperature difference decreased, the temperature ratio tended to increase as the volume reduction rate of the structure. Scenario analysis showed that when the volume decreased by up to 94.46%, the temperature difference decreased by up to 99.97%, and the temperature ratio increased by up to 57.15%.
A temperature increase rate of 0.41 was observed in the case of intact firewalls, but the temperature increased sharply to 0.59–3.70 in the case of damaged firewalls. Furthermore, the time to reach the reference temperature, 607.37°C in this paper, was reduced by 90.62% compared to the intact firewall with a minimum of 5.63 minutes, depending on the degree of damage.
Mineral wool is an insulating material and does not guarantee the resistance of the structure to damage, and research on dynamic material properties is insufficient. In this study, the dynamic fracture strain of mineral wool was estimated by parametric studies. Therefore, it is s necessary to derive the dynamic material properties through experiments on the target load, when a close investigation of the damage behavior characteristics of firewalls, including insulation materials, such as mineral wool materials.
The fire resistance performance was analyzed in terms of the temperature difference and ratio, temperature increase rate, and the time to reach reference temperature between both surfaces of the firewall panel. As a result, there was a clear difference in performance depending on the degree of damage. This method is anticipated to be a variable when calculating the design load considering the explosion impact.