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Effect of Geometry and Dimensions on the Upward Fire Spread in U-Shaped Structures.
- Source :
- Fire Technology; Jan2023, Vol. 59 Issue 1, p73-93, 21p
- Publication Year :
- 2023
-
Abstract
- U-shaped structures are very common in the facade of buildings, which have a significant impact on fire spread. In this paper, the effect of the geometrical factor (α), the cross-sectional area (A), the height (H) on the upward fire spread in u-shaped structures are analyzed based on the fire spread rate (V<subscript>f</subscript>) and the pressure difference between the top and the bottom (ΔP) through full-scale experiments and simulations. A dimensionless structure parameter α H / A is put forward to analyze the coupling effect of the structure size. It is found that V<subscript>f</subscript> increases in the form of logarithmic function as α increases. ΔP<subscript>max</subscript> increases in the form of exponential function as α increases; both V<subscript>f</subscript> and ΔP<subscript>max</subscript> decrease in the form of exponential function as A increases; V<subscript>f</subscript> is positively correlated with H linearly. ΔP<subscript>max</subscript> increases in the form of quadratic function as H increases; both V<subscript>f</subscript> and ΔP<subscript>max</subscript> increase in the form of Slogistic function as α H / A increases. When α H / A ≤ 17.2 or α H / A ≥ 38.8, α H / A has little effect on ΔP<subscript>max</subscript>. The V<subscript>f</subscript> in the non-overhead structure is very close to that in the overhead structure. This study can provide a theoretical guide for the fire protection design of u-shaped structures covered with insulation materials in practical engineering. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00152684
- Volume :
- 59
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Fire Technology
- Publication Type :
- Academic Journal
- Accession number :
- 161884368
- Full Text :
- https://doi.org/10.1007/s10694-021-01191-1