- Volume 23 Issue 5
DOI QR Code
One-Dimensional Heat Transfer Model to Predict Temperature Distribution in Voided slabs subjected to fire
화재 시 중공슬래브의 온도분포 예측을 위한 1방향 열전달 모델
- Received : 2019.05.30
- Accepted : 2019.08.20
- Published : 2019.09.01
In general, a reinforced concrete slabs are known to have a high fire resistance performance due to thermal properties of concrete materials. However, according to previous research, the thermal behavior of voided slabs is reported to be different from that of conventional RC solid slabs, and the differences seem to be caused by the air layer formed inside the voided slab. Therefore, it is difficult to estimate the temperature distribution of the voided slab under fire by using the existing methods that do not take into account the air layer inside the voided slab. In this study, a numerical analysis model was proposed to estimate the temperature distribution of voided slabs under fire, and evaluated. Heat transfer of slabs under fire is generally caused by conduction, convection and radiation, and time-dependent temperature changes of slab can be determined considering these phenomena. This study proposed a numerical method to estimate the temperature distribution of voided slabs under fire based on a finite difference method in which a cross-section of the slab is divided into a number of layers. This method is also developed to allow consideration of heat transfer through convection and radiation in air layer inside of slabs. In addition, the proposed model was also validated by comparison with the experimental results, and the results showed that the proposed model appropriately predicts the temperature distribution of voided slabs under fire.
Voided slabs;heat transfer;thermal distribution;finite difference method
Supported by : 한국연구재단
- ACI 216R-89 (1989), Guide for Determining the Fire Endurance of Concrete Elements, ACI Committee 216, ACI.
- ACI 216R-07 (2007), Requirements for Determining Fire Resistance of Concrete and Masonry Construction Assemblies, ACI Committee 216, ACI.
- Euro Code 2, Design of Concrete Structures-Part 1.2, 2004
- Choi, H.K., and Bang, C.H. (2015), Analytical Study on Thermal Properties of Hollow Slab at Elevated Temperature, Journal of Korean Institute of Fire Sci. and Eng., KIFSE, 15(2), 17-23
- Chung, J.H., Cho, H.J., Lee, S.C., Choi, H.K., and Choi, C.S. (2012), An Experimental Study on the Fire Resistance Performance for the Donut Type Biaxial Hollow Slab, Journal of Korea Architectural Institute, AIK, 28(12), 3-10.
- Hertz, K. (1981), Simple Temperature Calculations of Fire Exposed Concrete Constructions, Report No 159, Institute of Building Design
- Kim, H.Y., Kim, H.J., Cho, B.Y., Yeo, I.H., and Kwon, I.K. (2011), An Experimental Study on the Fire Behavior of Concrete Void Slab under Standard Fire with Loading Condition, Journal of Korean Institute of Fire Sci. and Eng., KIFSE, 25(6), 64-72
- Lie, T.T., and Williams-Leir, G. (1979), Factors affecting temperature of fire-exposed concrete slabs, National Research Council Canada - Reprinted from Fire and Materials, 3(2), 74-79
- UlfWickstrom. (1986) A Very simple method for estimating temperature in fire exposed concrete structures, Fire technology Technical report, 46
- Hong-BO, Wang (1995) Heat Transfer Analysis of Components of Construction Exposed to Fire, Doctoral dissertation, University of Salford, 1-193