Fire Resistance of Reinforced Concrete Corrosion-Damaged Columns of the "Standard" Fire

Abstract:

The article describes the features of the effect of corrosion of reinforcement on the bearing capacity of reinforced concrete columns in a "standard" fire. On the basis of the standard calculation method, the fire resistance of the column was estimated under a four-sided fire effect taking into account the different duration of the fire. The study examined the operation of the column in a corrosive environment, it was assumed that the initiation of corrosion of concrete and reinforcement will occur after 10 years of exploitation. It was found that the destruction of concrete protective layer 25 mm thick in a medium aggressive environment will occur after 25 years, and the diameter of the reinforcement during this period will decrease by 20%. To compare the results, a reinforced concrete column with a section of 400x400mm was calculated under the influence of a “standard” fire under normal operating conditions and taking into account work in a corrosive environment. The results of heat engineering calculations are presented, where the temperature changes in the reinforcement depending on the heating time and reduction of the protective layer thickness, as well as the change in the diameter of the reinforcement and its effect on the bearing capacity are shown. It has been established that reducing the cross-sectional area of the working reinforcement and reducing the cross-sectional dimensions of the column due to the occurring corrosion processes leads to a decrease in the fire resistance limit on the loss of bearing capacity by 58%.

• Periodical: Key Engineering Materials (Volume 828)
• Pages: 163-169
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.828.163
• Online since: December 2019
• Authors: Ashot Georgievich Tamrazyan*, Micheal Sergeevich Mineev, Aishat Urasheva
• Keywords: Corrosion, Fire Resistance, Reinforced Concrete Column

References

[1] A.G, Tamrazyan, L.A. Avetisyan, Behavior of compressed reinforced concrete columns under thermodynamic influences taking into account increased concrete deformability, Materials Science and Engineering. 365 (2018) 1-8.

DOI: 10.1088/1757-899x/365/5/052034

[2] M. Baca, Z. Muszynski, J. Rybak, T. Zyrek, A.G. Tamrazyan, Cyclic load tests of driven pile base capacity, Advances and Trends in Engineering Sciences and Technologies (2016) 723-728.

DOI: 10.1201/9781315393827-123

[3] A.G. Tamrazyan, The Assessment of Reliability of Punching Reinforced Concrete Beamless Slabs under the Influence of a Concentrated Force at High Temperatures, Procedia Engineering. 153 (2016) 715-720.

DOI: 10.1016/j.proeng.2016.08.231

[4] A.G. Tamrazyan, L.A. Avetisyan, Experimental and Theoretical Study of Reinforced Concrete Elements under Different Characteristics of Loading at High Temperatures, Procedia Engineering. 153 (2016) 721-725.

DOI: 10.1016/j.proeng.2016.08.232

[5] O.V. Kabantsev, A.G. Tamrazian, Allowing for changes in the calculated scheme during the analysis of structural behavior, Magazine of Civil Engineering. 49 (5) (2014) 15-26.

DOI: 10.5862/mce.49.2

[6] V.M. Roytman, Engineering decision of fire resistance projected and reconstructed buildings, Pozhnauka, Moscow, (2001).

[7] A.F. Milovanov, Resistance of reinforced concrete structures in case of fire, Stroyizdat, Moscow, (1998).

[8] O.V. Mkrtychev, D.S. Sidorov, Analysis of Exposure of Reinforced Concrete Buildings to Temperature Loads, Vestnik MGSU. 5 (2012) 50-55.

[9] U. Schneider, Concrete at high temperatures - a general review, Fire Safety Journal. 13 (1) (1988) 55-68.

[10] J. Khalaf, Z. Huang, The bond behavior of reinforced concrete members at elevated temperatures, Fire Safety Journal. (2019) 19-33.

DOI: 10.1016/j.firesaf.2018.12.002

[11] A. G. Tamrazyan, V. Y. Lushnikova, The effect of reinforcement and reinforcement, Magazine of Civil Engineering. 4 (80) (2018) 128-137.

[12] A. Tamrazyan, D. Popov, Reduce of bearing strength of the bent reinforce-concrete elements on a sloping section with the corrosive damage of transversal armature, MATEC Web of Conferences RSP 2017 – 26th R-S-P Seminar (2017) Theoretical Foundation of Civil Engineering. 117 (2017) 1-6.

DOI: 10.1051/matecconf/201711700162

[13] E.A. Larionov, Bearing Capacity of Corroded Bending Reinforced Concrete Element, Vestnik MGSU. 7 (2014) 51-63.

DOI: 10.22227/1997-0935.2014.7.51-63

[14] V.I. Kolchunov, M.S. Gubanova, D.V. Karpenko, Calculated model of the long-term deformation of a plane-stressed, corrosion-damaged reinforced concrete element in the contact zone of two concrete, Building mechanics of engineering structures and structures. 1 (2017) 49-57.

[15] Interstate Standard 30247.0-94. Elements of building constructions. Fire-resistance tests methods. General requirements.

[16] Y. Liu, R. E. Weyers, Modeling the contaminated concrete structures, ACI Materials Journal, 95 6 (1998) 675-681.

[17] STO 36554501-006-2006, Benefit by calculation of fire resistance and fire safety of steel concrete designs from heavy concrete.

[18] SP 63.13330.2012, Concrete and Reinforced Concrete Structures. The Main Provisions. The Updated Edition of SNIP 52-01-2003, Moscow, (2012).