Abstract
The metallic‐framework drywall is used as the specimens in this research. The standard fire test and finite element simulation were performed once on 300 cm × 300 cm area specimen and twice on 100 cm × 100 cm area specimens, to quantify and evaluate the effect of the junction boxes on the fireproof property after being embedded into the metallic‐framework drywall. The results of the experiment show that the temperature of unexposed surface rises faster due to the higher thermal conductivity of the internal metal junction box. The general junction box whose material is PVC can be softened off when heated, affecting the integrity of the firewall and also leading to rapid transfer to the unexposed surface. The prediction of finite element simulation temperature is highly correlated with the results of the real experiment. It is effective to strengthen the original weaknesses by adding a calcium silicate board behind the junction box and using metal panels instead of PVC. The temperature of the temperature junction box surface which is the highest temperature point of unexposed surface decreased most significantly at 72.9°C after the reinforcement. In addition, after reinforcement, the fire resistance time can reach to 1 hour by inserting the junction box into the metallic‐framework drywall.
Highlights
With the development of architectural technology and fire engineering during the last decade, the construction project tends to develop high-rise and giant buildings
According to ISO 834-1 [2], when the highest temperature of the unexposed surface is higher than the initial temperature by 180°C, it can be judged that the fire resistance is destroyed
Test 1 is the full-scale standard test with 3 m × 3 m, and its standard fire test specimen and measuring temperatures of CFD finite element numerical modelling are in accordance with the test. e results obtained by comparing numerical modelling and standard fire test are shown in Figure 12. e heating curve of the test furnace is in accordance with the modelling standard heating curve which shows that the standard fire test temperature confirms with the regulation of ISO 834-1 [2]
Summary
With the development of architectural technology and fire engineering during the last decade, the construction project tends to develop high-rise and giant buildings. E above research studies on the fire resistance of dry metallic-framework wall are based on the standard fire test experiments. Collier and Buchanan [13] presented the prediction model for fire resistance of drywall by the finite element method; Do et al [14] came up with that the thermal conductivity of porous material is mainly related to the thermal conductivity of its components and spatial arrangement of its complex structure by formula, microstructure observation, and experiments; Nassif et al [15] presented the comparison of thermal conductivity of a dry gypsum board wall by the standard fire experiment and by numerical modelling. This research focused on the quality control of the board with standard fire test experiment It does not consider numerical modelling and corresponding quantitative research. Test 3 simulates the feasibility of the reinforcement scheme by CFD numerical modelling, tests on the specimen of which fire area is 100 cm (width) ∗ 100 cm (height), and verifies the feasibility of numerical modelling and reinforcement scheme by the use of the standard fire test
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