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Calculation of the limit of fire resistance of single-layer glass unit

UDC 614.841.332
Authors Dmitrichenko Aleksandr Stepanovich, PhD in Technical Sciences, Associate Professor
Zditovetskaya Svetlana Valentinovna, PhD in Technical Sciences
Mamedova Sevindzh Izzat
Abstract Purpose. The article provides a method for calculating the fire resistance of translucent structures. As a translucent structure, we consider a single-layer double-glazed glass unit consisting of a frame and two glasses separated by an air space. The fire resistance limit is determined by the limit state – the criterion of integrity.
Methods. Calculations of temperature and stress distribution in a limited glass panel are performed numerically using the Flexpde software package. Finding. When calculating the fire resistance limit, the temperature dependence of thermal characteristics of glass, air and flue gases, design features of translucent structures and nonlinear nature of changes in ambient temperature during fire exposure are taken into account. As a result of the calculations, it was shown that the time of destruction onset increases with increasing of panel thickness. Moreover, the second panel is destroyed faster than the first one because it is exposed to hotter flue gases, so that the total time of destruction of a single-layer double-glazed glass unit does not exceed the time of destruction of a single glass twice, but only by 1.66 times.
Application field of research. The obtained results can be used in the development of the draft additions and changes in the TCP 45-2.02-110-2008. Conclusion. The developed method makes it possible to calculate the fire resistance limit by the criterion of achieving critical stresses in a single-layer glass unit leading to its destruction.
Keywords translucent structure, limit of fire resistance, thermal tension, thermal influence
  References
1. European Standard EN 1991-1-2:2002. Eurocode 1: Actions on structures. Part 1–2: General actions – Actions on structures exposed to fire. Brussels: European committee for standardization, 2002. 61 р..
2. European Standard EN 1992-1-2:2004. Eurocode 2: Design of concrete structures. Part 1–2: General rules – Structural fire design. Brussels: European committee for standardization, 2004. 99 р..
3. European Standard EN 1993-1-2:2005. Eurocode 3: Design of steel structures. Part 1–2: General rules – Structural fire design. Brussels: European committee for standardization, 2005. 78 р..
4. European Standard EN 1994-1-2:2005. Eurocode 4: Design of composite steel and concrete structures. Part 1–2: General rules – Structural fire design. Brussels: European committee for standardization, 2005. 109 р..
5. European Standard EN 1995-1-2:2004. Eurocode 5: Design of timber structures. Part 1–2: General rules – Structural fire design. Brussels: European committee for standardization, 2004. 69 р..
6. European Standard EN 1996-1-2:2005. Eurocode 6: Design of masonry structures. Part 1–2: General rules – Structural fire design. Brussels: European committee for standardization, 2005. 83 р..
7. European Standard EN 1999-1-2:2007. Eurocode 9: Design of aluminium structures. Part 1–2: General rules – Structural fire design. Brussels: European committee for standardization, 2007. 61 р..
8. European Standard EN 1363-1:1999. Fire resistance tests. Part 1: General requirements. Мoscow: BSI, 1999. 52 р..
9. Mezhgosudarstvennyy standart. Steklo i izdeliya iz nego. Metod ispytaniya na ognestoykost' GOST 33000-2014 [Glass and glassware. A test method on fire resistance: Interstate Standard GOST 33000-2014]. Affirmed April 1, 2016. Moscow: Standartinform, 2015. 13 p. (rus).
10. Dmitrichenko A.S., Zditovetskaya S.V., Yanovskiy S.Yu., Kerimov K.D. Issledovanie termonapryazhennogo sostoyaniya svetoprozrachnoy konstruktsii pri ognevom vozdeystvii [Study of the thermal stress state of glazing assembly induced by fire]. Trudy BGTU. Ser.3. Fhys.and Maths. Siences, 2018. No. 2. Pp. 76–81. (rus).
11. Cuzzillo B.R., Pagni P.J. Thermal Breakage of Double-pane Glazing by Fire. Journal of Fire Prot. Engr., 1998. Vol. 9, No. 1. Pp. 1–11..
12. Martynenko O.G., Sokovishin Yu.A. Svobodno-konvektivnyy teploobmen. Spravochnik [Free convective heat transfer. Reference book]. Minsk: Nauka i technika, 1982. 399 p. (rus).
13. FlexPDE finite element model builder for Partial Differential Equations. Safety, available at http://www.pdesolutions.com (accessed: September 15, 2018)..
14. Bansal N.P., Doremus R.H. Handbook of Glass Properties. New York: Academic Press Inc., 1986. 680 p..
15. McLellan G. W., Shand E. B. Glass Engineering Handbook. New York: McGrawHill Book Co., 1984. 484 p..