Abstract
With the aim of providing experimental data on the shear capacity and behavior of corroded reinforced concrete beams that may help in the development of strength prediction models, the test results of 13 corroded and four un-corroded beams are presented. Corrosion damage was induced by accelerated corrosion induction through impressed current. Test results show that loss of shear strength of beams is mostly attributable to two important damage factors namely, the reduction in stirrups area due to corrosion and the corrosion-induced cracking of concrete cover to stirrups. Based on the test data, a method is proposed to predict the residual shear strength of corroded reinforced concrete beams in which residual shear strength is calculated first by using corrosion-reduced steel area alone, and then it is reduced by a proposed reduction factor, which collectively represents all other applicable corrosion damage factors. The method seems to yield results that are in reasonable agreement with the available test data.
Highlights
Chloride-induced corrosion of reinforcing bars is one of the major causes of deterioration of reinforced concrete structures, affecting structures’ useful service life
With the aim of providing experimental data on the shear capacity and behavior of corroded reinforced concrete beams that may help in the development of strength prediction models, the test results of 13 corroded and four un-corroded beams are presented
Test results show that loss of shear strength of beams is mostly attributable to two important damage factors namely, the reduction in stirrups area due to corrosion and the corrosion-induced cracking of concrete cover to stirrups
Summary
Chloride-induced corrosion of reinforcing bars is one of the major causes of deterioration of reinforced concrete structures, affecting structures’ useful service life. Int J Adv Struct Eng (2016) 8:307–318 compromises structural safety, corrosion damage has always been a concern. This has generated much interest in developing analytical approaches to predict residual strength of corroded members that may serve as tools to decide on appropriate course of action to ensure safety. The past studies mainly focused on three fronts: flexural behavior and load carrying capacity of corroded members for which references (Cabrera 1996; TorresAcosta and Madrid 2003; Torres-Acosta et al 2007; Rodriguez et al 1997; Mangat and Elgarf 1999; Azad et al 2007, 2010) are cited only as representative samples of work, bond strength and bond behavior of corroded reinforcing bars (Almusallam et al 1996; Amleh and Mirza 1999; Azad et al 2010; Fang et al 2004; Fu and Chung 1997; Jeppsson and Thelandersson 2003; Jin and Zhao 2001; Lee et al 2002; Ouglova et al 2008) and cracking of concrete cover due to corrosion of steel bars (Alonso et al 1998; Molina et al 1993; Liu and Weyers 1998; Rasheeduzzafar Al-Saadoun and Al-Gahtani 1992; Vidal et al 2004; Higgins and Farrow 2006)
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