Modeling of the reinforced cast-in-place concrete slab heating at fire test as a part of the experimental frame building unit

Authors

  • Vadim A. Kudryashov State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, Mashinostroiteley str., 25 https://orcid.org/0000-0003-4889-1060
  • Igor' Yu. Kurachenko Research Institute of Fire Safety and Emergencies of the Ministry for Emergency Situations of the Republic of Belarus; 220046, Belarus, Minsk, Soltysa str., 183a https://orcid.org/0000-0002-2898-1811

DOI:

https://doi.org/10.33408/2519-237X.2022.6-1.17

Keywords:

fire resistance, reinforced concrete monolithic slab, modeling, heating, calculation model, Ansys Workbench, temperature field, heat engineering calculation, brittle fracture of concrete, local damage to the protective layer of concrete

Abstract

Purpose. Based on the results of previously conducted full-scale fire tests of an experimental frame building unit including reinforced cast-in-place concrete slab and reinforced precast centrifugal concrete tube columns to develop a calculation model and assess the temperatures during the slab heating at fire.

Methods. Numerical method for reinforced cast-in-place concrete slab heating using Ansys Workbench finite element analysis system. The analogy technique. The graphical method analysis. Assessment of temperature field distribution over the examined structure cross section. The heating results comparison analysis with the available experimental data.

Findings. An analysis of the damage to a reinforced concrete monolithic floor, obtained during full-scale fire tests, is presented. It has been established that on the side of the heated surface, the greatest damage was observed mainly on the surface layers of compressed concrete in the places of maximum compressive stresses, in the stretched zone the damage was insignificant. A computational model for the heating of a reinforced concrete floor has been developed, which made it possible to establish that the brittle fracture of concrete significantly affected the heating of the reinforcement. The average heating temperature of the working longitudinal reinforcement with a diameter of 10 mm with a protective layer of 20 mm at a temperature regime fixed in the central part of the floor fragment was 402 °C, in a local area with a protective layer of 13.5 mm – 486 °C The design temperature of the upper longitudinal reinforcement located in the support areas did not exceed 20 °C, and that of the unheated surface did not exceed 15 °C. The average temperatures in the calculated sections of the floor, as well as temperature diagrams along the height of the floor section, are obtained. The experimental average overlap temperature was 144 °C, which is 23 % lower than the calculated value (187 °C with a slab thickness of 200 mm), because the calculation did not take into account the decrease in temperature on the heated floor surface by the end of the experiment. The calculated average temperature of heating the cross-section of the floor with a thickness of 193.5 mm was 184 °C, with a thickness of 166.5 mm – 231 °C.

Application field of research. The results of the research can be used for fire resistance estimation of the reinforced concrete structures. It is planned to apply the obtained results to determine the load-bearing fire resistance function of the tested reinforced cast-in-place concrete slab.

Author Biographies

Vadim A. Kudryashov, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; 220118, Belarus, Minsk, Mashinostroiteley str., 25

Department of Scientific and Innovation Activity, Head of Department of Scientific and Innovation Activity; PhD in Technical Sciences, Associate Professor

Igor' Yu. Kurachenko, Research Institute of Fire Safety and Emergencies of the Ministry for Emergency Situations of the Republic of Belarus; 220046, Belarus, Minsk, Soltysa str., 183a

Fire Safety Advisory Center, Chief Specialist

References

Brushlinsky N.N., Ahrens M., Sokolov S.V., Wagner P. World Fire Statistics = Mirovaya pozharnaya statistika = DieFeuerwehrstatistik der Welt: Report № 25. Center of Fire Statistics of CTIF. Available at: http://ctif.org/sites/default/files/2020-06/CTIF_Report25.pdf (accessed: May 29, 2021).

Roytman V.M. Inzhenernye resheniya po otsenke ognestoykosti proektiruemykh i rekonstruiruemykh zdaniy [Engineering solutions for assessing the fire resistance of designed and reconstructed buildings]. Moscow: Pozhnauka, 2001. 382 p. (rus)

Roytman V.M., Serkov B.B., Sivenkov A.B., Shevkunenko Yu.G., Barinova E.L., Pristupyuk D.N. Zdaniya, sooruzheniya i ikh ustoychivost' pri pozhare [Buildings, structures and their stability in case of fire]. Moscow: Academy of the State Fire Service EMERCOM of Russia, 2013, 364 p. (rus)

Telichenko V.I., Roytman V.M., Benuzh A.A. Kompleksnaya bezopasnost' v stroitel'stve [Comprehensive safety in construction]: tutorial. Moscow: National Research Moscow State University of construction, 2015, 144 p. (rus)

Kudryashov V.A., Zhamoydik S.M., Kurachenko I.Yu., Nguen T.K. Rezul'taty naturnykh ognevykh ispytaniy zhelezobetonnogo monolitnogo perekrytiya v sostave eksperimental'nogo fragmenta karkasnogo zdaniya [Results of full-scale fire tests of the monolithic reinforced concrete slab as part of a fragment of a frame building]. Journal of Civil Protection, 2021. Vol. 5, No. 1. Pp. 49–66. (rus). DOI: https://www.doi.org/10.33408/2519-237X.2021.5-1.49.

Kudryashov V.A., Zhamoydik S.M., Kurachenko I.Yu., Mordich M.M. Konstruirovanie zhelezobetonnogo monolitnogo perekrytiya v sostave fragmenta karkasnogo zdaniya dlya issledovaniy ognestoykosti v ramkakh naturnykh ognevykh ispytaniy [Cast-in-place reinforced concrete plate construction as a part of a frame experimental building for fire resistance research]. Journal of Civil Protection, 2021. Vol. 5, No. 1. Pp. 33–48. (rus). DOI: https://www.doi.org/10.33408/2519-237X.2021.5-1.33.

Kudryashov V.A., Kurachenko I.Yu. Issledovanie ognestoykosti zhelezobetonnogo monolitnogo perekrytiya v sostave fragmenta karkasnogo zdaniya v ramkakh naturnykh ognevykh ispytaniy [Research on the fire resistance of a reinforced concrete cast-in-place slab as part of a frame building fragment in full-scale fire testing]. Proc. ХХХIII Intern. scientific-practical conf., dedicated to the year of science and technology «Aktual'nye problemy pozharnoy bezopasnosti», Moscow, May 12–15, 2021. Moscow: All-Russian Research Institute for Fire Protection EMERCOM of Russia. 2021. Pp. 554–564. (rus).

Nekhan' D.S., Kurachenko I.Yu., Olesiyuk N.M., Kreer L.A. Issledovaniya temperatury gazovoy sredy pri provedenii naturnykh ognevykh ispytaniy stroitel'nykh konstruktsiy [Temperature studies of the gaseous medium during full-scale fire tests of building constructions]. Journal of Civil Protection, 2020. Vol. 4, No. 2. Pp. 130–141. (rus). DOI: https://www.doi.org/10.33408/2519-237X.2020.4-2.130.

Bushev V.P., Pchelintsev V.A., Fedorenko V.S., Yakovlev A.I. Ognestoykost' zdaniy [Fire resistance of building]. Moscow: Stroyizdat, 1970. 261 p. (rus)

Serkov B.B., Firsova T.F. Zdaniya i sooruzheniya [Buildings and structures]: textbook. Moscow: RC «INFRA-M», 2018. 168 p. (rus)

Schleifer V. Zum Verhalten von raumabschliessenden mehrschichtigen Holzbauteilen im Brandfall [About the behaviour of room-closing multi-layer wood components in case of fire]: Dissertation ETH Nr. 18156. Zürich, 2009. 147 s. (deu).

Geydon A.G., Vol'fgard Kh.G. Plamya, ego struktura, izluchenie i temperatura [Flame, its structure, radiation and temperature]. Moscow: Metallurgizdat, 1959. 333 p. (rus).

Yakovlev A.I. Osnovy rascheta ognestoykosti zhelezobetonnykh konstruktsiy [Basics for calculation of fire resistance of reinforced concrete structures]. Grand PhD techn. sci. diss: 05.26.03. Moscow, 1966. 515 p. (rus).

Roytman V.M. Otsenka ognestoykosti stroitel'nykh konstruktsiy na osnove kineticheskikh predstavleniy o povedenii materialov v usloviyakh pozhara [Fire resistance Assessment of building structures based on kinetic concepts of the behavior of materials in fire]. Grand PhD techn. sci. diss: 05.26.01. Moscow, 1985. 412 p. (rus)

Polevoda I.I. Ognestoykost' izgibaemykh zhelezobetonnykh konstruktsiy iz vysokoprochnogo betona [Fire resistance of bent reinforced concrete structures made of high-strength concrete]. PhD techn. sci. diss: 05.23.01. Minsk, 2004. 122 p. (rus)

Kudryashov V.A. Ognestoykost' zhelezobetonnykh sborno-monolitnykh perekrytiy karkasnykh zdaniy s primeneniem mnogopustotnykh plit [Fire resistance of cast-in-place reinforced concrete slabs in frame buildings with multi-core slabs]. PhD techn. sci. diss: 05.23.01. Minsk, 2009. 121 p. (rus)

Downloads


Abstract views: 169
PDF Downloads: 115

Published

2022-02-25

How to Cite

Kudryashov В. А. and Kurachenko И. Ю. (2022) “Modeling of the reinforced cast-in-place concrete slab heating at fire test as a part of the experimental frame building unit”, Journal of Civil Protection, 6(1), pp. 17–41. doi: 10.33408/2519-237X.2022.6-1.17.

Most read articles by the same author(s)