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Earthquakes and Structures
  Volume 19, Number 5, November 2020 , pages 361-377
DOI: https://doi.org/10.12989/eas.2020.19.5.361
 


Application of ultra-high performance fiber reinforced concrete for retrofitting the damaged exterior reinforced concrete beam-column joints
Mohammed A. Al-Osta, Muhammad I. Khan, Ashraf A. Bahraq and Shi-Yu Xu

 
Abstract
    In the present research work, the effectiveness and the efficiency of a retrofitting approach using a layer of ultra-high performance fiber reinforced concrete (UHPFRC) jacket for damaged substandard exterior beam-column joints (BCJs) is experimentally investigated. The main objective of this study is to rehabilitate the already damaged BCJs to meet the serviceability requirements without compromising safety. According to the proposed strengthening technique, a chipped surface, lightly brushed with a dry condition was selected for making a successful bond between normal concrete substrate surface (NCSS) and UHPFRC. Then a fresh UHPFRC jacket with a thickness of 30 mm was cast around the damaged specimens. The entire test matrix was comprised of three 1/3 scale damaged exterior BCJs with a different column axial load (CAL). These specimens were repaired with UHPFRC and retested under monotonic loading. Based on the experimental results, repaired specimens showed an excellent performance in terms of their load-displacement response, maximum strength, displacement ductility, initial stiffness, secant stiffness and energy dissipation capacity when compared with the corresponding values registered when these specimens were tested in their virgin state. This rehabilitative intervention not only restored the strength, stiffness, ductility and energy dissipation capacity of severely damaged specimens but also improved their performance.
 
Key Words
    repairing; UHPFRC jacketing; beam-column connection; energy dissipation; experiment
 
Address
Mohammed A. Al-Osta, Khan, Ashraf A :Dept. of Civil and Environmental Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
Muhammad I. Khan and Shi-Yu Xu:Dept. of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong SAR
 

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