Residual Shear Capacity of Reinforced Concrete Beams after Fire Exposure
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-1758-7
Structural Engineering
Residual Shear Capacity of Reinforced Concrete Beams after Fire Exposure Yamin Song a, Chuanguo Fub, Shuting Liang and Weiyi Kong a
a
, Dong Lib, Longji Dang
a
, Chongfang Sun
b
,
a
School of Civil Engineering, Southeast University, Nanjing 210096, China Dept. of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China
b
ARTICLE HISTORY
ABSTRACT
Received 17 October 2019 Revised 2 February 2020 Accepted 1 July 2020 Published Online 10 September 2020
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.
KEYWORDS After fire Reinforced concrete (RC) beam Stirrup ratio Residual shear capacity Shear span ratio
1. Introduction Fires are some of the most common disasters today. Studies have shown that the high temperature of a fire seriously affects the performance of reinforced concrete (RC) members, such as the modulus of elasticity, deformation, and strength (Hsu et al., 2006; Arioz, 2007; Biolzi et al., 2008; Bingöl and Gül, 2009; Felicetti et al., 2009; Ergün et al., 2016). Thus, a building fire seriously threatens the residual load bearing performance of an RC member (Lu et al., 2004; Jau and Huang, 2008; Kodur and Agrawal, 2016; Molkens et al., 2017; Jiang et al., 2017, 2018). Studying the shear bearing capacity of RC members after fire exposure is of considerable theoretical significance and practical value. Few experimental studies have examined the effect of fire on the residual shear bearing capacity of RC members. Many factors (e.g., the types of fire exposure, material properties, and load level) can affect the strength and stiffness degradation of RC members after fire. Researchers have carried out standard and non-standard fire tests on structures (ASTM E119-11a, 2011; Wong and Ng, 2011; Bisby et al., 2013) in which RC beams
CORRESPONDENCE Yamin Song
[email protected]
ⓒ 2020 Korean Societ
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