Novel empirical model for predicting residual flexural capacity of corroded steel reinforced concrete beam
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RESEARCH ARTICLE
Novel empirical model for predicting residual flexural capacity of corroded steel reinforced concrete beam Zhao-Hui LUa,b, Hong-Jun WANGb, Fulin QUc, Yan-Gang ZHAOa, Peiran LIc, Wengui LIc* a
Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China b School of Civil Engineering, Central South University, Changsha 410075, China c School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2007, Australia *
Corresponding author. E-mail: [email protected]
© Higher Education Press 2020
ABSTRACT In this study, a total of 177 flexural experimental tests of corroded reinforced concrete (CRC) beams were collected from the published literature. The database of flexural capacity of CRC beam was established by using unified and standardized experimental data. Through this database, the effects of various parameters on the flexural capacity of CRC beams were discussed, including beam width, the effective height of beam section, ratio of strength between longitudinal reinforcement and concrete, concrete compressive strength, and longitudinal reinforcement corrosion ratio. The results indicate that the corrosion of longitudinal reinforcement has the greatest effect on the residual flexural capacity of CRC beams, while other parameters have much less effect. In addition, six available empirical models for calculating the residual flexural strength of CRC beams were also collected and compared with each other based on the established database. It indicates that though five of six existing empirical models underestimate the flexural capacity of CRC beams, there is one model overestimating the flexural capacity. Finally, a newly developed empirical model is proposed to provide accurate and effective predictions in a large range of corrosion ratio for safety assessment of flexural failure of CRC beams confirmed by the comparisons. KEYWORDS
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CRC beams, flexural capacity, steel corrosion, database, empirical models
Introduction
Presently, the durability problem of reinforced concrete (RC) beams has attracted more and more attention all over the world. Among the many causes of durability damage of beams, premature failure of beams caused by reinforcement corrosion is one of the biggest threats currently faced by the RC industry [1]. Identifying and quantifying the impacts of deteriorating on the residual bearing capacity of RC beams can provide the currently used inspection procedures with lots of strategic and cost-effective rehabilitation methods [2]. Therefore, many researchers have been devoted to investigate the residual strength and performance of corroded reinforced concrete (CRC) beams. Almusallam et al. [3] studied the effect of Article history: Received Apr 17, 2019; Accepted Aug 7, 2019
reinforcement corrosion on flexural behavior of RC slabs; Rodriguez et al. [4] tested the bending resistance of CRC beams with different reinforcement ratios, stirrup spacing and corrosion rate. Mangat and Elgarf [5] cond
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