Abstract
The mechanical properties of concrete and steel are seriously degraded under high temperature, so that reinforced concrete (RC) members after fire may not be able to satisfy the prescribed performance. In this study, 27 full-scale RC beams were carried out shear tests to investigate the shear behaviour after fire. A total of 20 beams were subjected to fire on three sides in accordance with ISO 834 standard fire curve, and the remaining 7 beams (which were not subjected to fire) were employed as a reference. The influences of fire time, stirrup ratio, shear span ratio, longitudinal reinforcement ratio, and preloading (40% loading level) were considered. The experimental results indicated that the shear failure mode of the RC specimens after fire exposure was similar to that of the reference specimens. Both the residual shear load bearing capacity and stiffness of the RC beams decreased after being subjected to fire. The loss of shear bearing capacity increased with the heating time. In addition, the ultimate load bearing capacity of specimens with stirrups subjected to the same fire exposure time decreased with an increasing shear span ratio.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Arioz O (2007) Effects of elevated temperatures on properties of concrete. Fire Safety Journal 42(8):516–522, DOI: https://doi.org/10.1016/j.firesaf.2007.01.003
ASTM E119-11a (2011) Standard methods offne test of building construction and materials. ASTM International, West Conshohocken, PA, USA
Bingöl AF, Gül R (2009) Residual bond strength between steel bars and concrete after elevated temperatures. Fire Safety Journal 44(6):854–859, DOI: https://doi.org/10.1016/j.firesaf.2009.04.001
Biolzi L, Cattaneo S, Rosati G (2008) Evaluating residual properties of thermally damaged concrete. Cement and Concrete Composites 30(10):907–916, DOI: https://doi.org/10.1016/j.cemconcomp.2008.09.005
Bisby L, Gales J, Maluk C (2013) A contemporary review of large-scale non-standard structural fire testing. Fire Science Reviews 2(1):1–27, DOI: https://doi.org/10.1186/2193-0414-2-1
Choi EG, Shin YS, Kim HS (2013) Structural damage evaluation of reinforced concrete beams exposed to high temperatures. Journal of Fire Protection Engineering 23:135151, DOI: https://doi.org/10.1177/1042391512474666
Dwaikat MB, Kodur VKR (2009) Response of restrained concrete beams under design fire exposure. ASCE Journal of Structural Engineering 135:1408–1417, DOI: https://doi.org/10.1061/(ASCE)ST.1943-541X.0000058
El-Hawary MM, Ragab AM, El-Azim AA, Elibiari S (1997) Effect of fire on shear behaviour of R.C. beams. Computers and Structures 65(2):281–287, DOI: https://doi.org/10.1016/S0045-7949(95)00356-8
Ergün A, Kürklü G, Başpinar MS (2016) The effects of material properties on bond strength between reinforcing bar and concrete exposed to high temperature. Construction and Building Materials 112:691–698, DOI: https://doi.org/10.1016/j.conbuildmat.2016.02.213
Felicetti R, Gambarova PG, Meda A (2009) Residual behavior of steel rebars and R/C sections after a fire. Construction and Building Materials 23(12):3546–3555, DOI: https://doi.org/10.1016/j.conbuildmat.2009.06.050
GB 50010–2010 (2015) Code for design of concrete structures. GB 50010-2010, China Architecture and Building Press, Beijing, China Hsu JH, Lin CS, Huang CB (2006) Modelling the effective elastic modulus of RC beams exposed to fire. Journal of Marine Science and Technology 14(2):102–108
ISO 834–1 (1999) Fire resistance tests-elements of building construction. Part 1: General requirement. ISO 834-1, ISO, Geneva, Switzerland Jau W, Huang K (2008) A study of reinforced concrete corner columns after fire. Cement and Concrete Composites 30(7):622–638, DOI: https://doi.org/10.1016/j.cemconcomp.2007.09.009
Jiang CJ, Lu ZD, Li LZ (2017) Shear performance of fire-damaged reinforced concrete beams repaired by a bolted side-plating technique. ASCE Journal of Structural Engineering 143(5):1–8, DOI: https://doi.org/10.1061/(ASCE)ST.1943-541X.0001726
Jiang CJ, Yu JT, Li LZ, Wang X, Wang L, Liao JH (2018) Experimental study on the residual shear capacity of fire-damaged reinforced concrete frame beams and cantilevers. Fire Safety Journal 100:140–56, DOI: https://doi.org/10.1016/j.firesaf.2018.08.004
Kodur VKR, Agrawal A (2016) An approach for evaluating residual capacity of reinforced concrete beams exposed to fire. Engineering Structures 110:293–306, DOI: https://doi.org/10.1016/j.engstruct.2015.11.047
Kumar A, Kumar V (2003) Behaviour of RCC beams after exposure to elevated temperatures. Journal of Institution of Engineers. India Journal Civil Engineering Division 84:165–170
Liao JH, Lu ZD, Su L (2013) Experiment and finite element analysis of shear strength of concrete beams subjected to elevated temperature. Journal of Tongji University (Natural Science) 41(6):806–812, DOI: https://doi.org/10.3969/j.issn.0253-374x.2013.06.002 (in Chinese)
Lu TQ, Zhao GF, Lin ZS (2004) Experimental study on mechanical properties of long standing concrete after exposure to high temperature. Journal of Building Structures 25(1):63–70, DOI: https://doi.org/10.14006/j.jzjgxb.2004.01.009
Molkens T, van Coile R, Gernay T (2017) Assessment of damage and residual load bearing capacity of a concrete slab after fire: Applied reliability-based methodology. Engineering Structures 150:969–985, DOI: https://doi.org/10.1016/j.engstruct.2017.07.078
Saafi M (2002) Effect of fire on FRP reinforced concrete members. Composite Structures 58(1):11–20, DOI: https://doi.org/10.1016/S0263-8223(02)00045-4
Sun JF, Shi XD, Guo ZH (2002) Experimental study on mechanical properties of 3-face heated reinforced concrete beams at elevating temperature and after cooling. Building Structure 32(1):34–36+22, DOI: https://doi.org/10.19701/J.JZJG.2002.01.009 (in Chinese)
Wong Y, Ng Y (2011) Effects of water quenching on reinforced concrete structures under fire. Presented at Kowloon Tong Fire Station, Hong Kong
Xu YY, Wu B, Jiang M, Huang X (2012) Experimental study on residual flexural behavior of reinforced concrete beams after exposure to fire. Advanced Materials Research 457–458:183–187, DOI: https://doi.org/10.4028/www.scientific.net/AMR.457-458.183
Yang HF, Qin YH, Liao Y, Chen W (2016) Shear behavior of recycled aggregate concrete after exposure to high temperature. Construction and Building Materials 106:374–381, DOI: https://doi.org/10.1016/j.conbuildmat.2015.12.103
Acknowledgements
This research was supported by National Natural Science Foundation of China (Project No. 51478254), National Natural Science Foundation for Young Scientists of China (51908336), and China Postdoctoral Science Foundation for General Funding Projects (2019M652301), which is gratefully acknowledged.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Song, Y., Fu, C., Liang, S. et al. Residual Shear Capacity of Reinforced Concrete Beams after Fire Exposure. KSCE J Civ Eng 24, 3330–3341 (2020). https://doi.org/10.1007/s12205-020-1758-7
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12205-020-1758-7